- Star-like oriented chromophores
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The tetrahedral arrangement of perylene bisimide chromophores gives a novel molecular system of antennae for the conversion of difuse solar radiation. A detailed analysis of their UV/Vis spectra gives an impression of the consolidation of the single chromophores.
- Langhals,Wagner,Ismael
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Read Online
- Three-Dimensional Radical Covalent Organic Frameworks as Highly Efficient and Stable Catalysts for Selective Oxidation of Alcohols
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With excellent designability, large accessible inner surface, and high chemical stability, covalent organic frameworks (COFs) are promising candidates as metal-free heterogeneous catalysts. Here, we report two 3D radical-based COFs (JUC-565 and JUC-566) in which radical moieties (TEMPO) are uniformly decorated on the channel walls via a bottom-up approach. Based on grafted functional groups and suitable regular channels, these materials open up the application of COFs as highly efficient and selective metal-free redox catalysts in aerobic oxidation of alcohols to relevant aldehydes or ketones with outstanding turn over frequency (TOF) up to 132 h?1, which has exceeded other TEMPO-modified catalytic materials tested under similar conditions. These stable COF-based catalysts could be easily recovered and reused for multiple runs. This study promotes potential applications of 3D functional COFs anchored with stable radicals in organic synthesis and material science.
- Chen, Fengqian,Ding, Jiehua,Fang, Qianrong,Guan, Xinyu,Li, Hui,Qiu, Shilun,Tang, Bin,Valtchev, Valentin,Yan, Yushan,Zhu, Liangkui
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supporting information
p. 22230 - 22235
(2021/09/03)
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- Zinc(ii) and cadmium(ii) amorphous metal-organic frameworks (aMOFs): Study of activation process and high-pressure adsorption of greenhouse gases
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Two novel amorphous metal-organic frameworks (aMOFs) with chemical composition {[Zn2(MTA)]·4H2O·3DMF}n (UPJS-13) and {[Cd2(MTA)]·5H2O·4DMF}n (UPJS-14) built from Zn(ii) and Cd(ii) ions and extended tetrahedral tetraazo-tetracarboxylic acid (H4MTA) as a linker were prepared and characterised. Nitrogen adsorption measurements were performed on as-synthesized (AS), ethanol exchanged (EX) and freeze-dried (FD) materials at different activation temperatures of 60, 80, 100, 120, 150 and 200 °C to obtain the best textural properties. The largest surface areas of 830 m2 g-1 for UPJS-13 (FD) and 1057 m2 g-1 for UPJS-14 (FD) were calculated from the nitrogen adsorption isotherms for freeze-dried materials activated at mild activation temperature (80 °C). Subsequently, the prepared compounds were tested as adsorbents of greenhouse gases, carbon dioxide and methane, measured at high pressures. The maximal adsorption capacities were 30.01 wt% CO2 and 4.84 wt% CH4 for UPJS-13 (FD) and 24.56 wt% CO2 and 6.38 wt% CH4 for UPJS-14 (FD) at 20 bar and 30 °C.
- Almá?i, Miroslav,Bourrelly, Sandrine,Király, Nikolas,Vilková, Mária,Zeleňák, Vladimír
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p. 20137 - 20150
(2021/06/28)
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- Cu(ii)Cl2containing bispyridine-based porous organic polymer support preparedviaalkyne-azide cycloaddition as a heterogeneous catalyst for oxidation of various olefins
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A new type of porous organic polymer (POP) based heterogeneous catalystCu-POPwas prepared by immobilizing Cu(ii)Cl2into bpy containing POP preparedviaalkyne-azide cycloaddition. This new catalyst showed efficient catalytic activities and outstanding reusability. Remarkably, one batch ofCu-POPwas continuously used for all olefins without losing its activity by simply washing.
- Choi, Hye Min,Lee, Suk Joong,Yoon, Jongho
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p. 9149 - 9152
(2020/06/17)
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- Tetrahedral octaamine compound and manufacturing method thereof
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Disclosed is a method for preparing octaamine compound, which comprises the steps of: (a) introducing a nitro group by nitrating tetraphenylmethine; (b) obtaining tetrakis(4-aminophenyl)methane by reducing the nitro group; (c) introducing an o-nitro group by nitrating the tetrakis(4-aminophenyl)methane; and (d) reducing the o-nitro group, wherein the step (d) is performed under a strong acid condition. Also, disclosed is an octaamine compound represented by chemical formula 1, wherein central atom is C and o-phenylenediamine is four-substituted to the central atom.COPYRIGHT KIPO 2020
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Paragraph 0092; 0103-0107
(2020/04/22)
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- Scalable Synthesis of Tetrapodal Octaamine
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An effective and high-yielding synthesis of an air stable tetrapodal octaamine, a rigid shape-persistent molecule with four ortho-phenylenediamine moieties is reported. It can be potentially transformed into a wide range of benzimidazole, benzotriazole, and pyrazine derivatives for practical applications.
- Ahmad, Ishfaq,Mahmood, Javeed,Baek, Jong-Beom
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supporting information
p. 2335 - 2338
(2019/01/04)
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- Luminescent covalent organic framework as a recyclable turn-off fluorescent sensor for cations and anions in aqueous solution
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Covalent organic frameworks (COFs) have shown great potential for use in ion sensing; however, applications of existing COFs are limited to sensing either cations or anions. In this study, a three-dimensional COF, COF-TT, is constructed by reacting the bis(tetraoxacalix[2]arene[2]triazine) core with tetra(p-aminophenyl)methane to provide a luminescent sensor. COF-TT exhibits ultrahigh thermal stability and exceptional chemical stability in aqueous solutions over a broad pH range from 2 to 14, which signifies immense practical potential for sensing applications. Excellent selectivity and high sensitivity of COF-TT toward Fe3+ cations and CrO42-, Cr2O72-, and MnO4- anions are evident via luminescence quenching. COF-TT also exhibits excellent recyclability in terms of washing and re-exposure cycles. Both experimental data and theoretical calculations are employed to unveil the mechanisms of the quenching effect and sensing properties of COF-TT.
- Li, Ming,Cui, Zhonghua,Pang, Shirui,Meng, Lingkun,Ma, Dingxuan,Li, Yi,Shi, Zhan,Feng, Shouhua
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supporting information
p. 11919 - 11925
(2019/10/16)
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- Three-Dimensional Tetrathiafulvalene-Based Covalent Organic Frameworks for Tunable Electrical Conductivity
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The functionalization of three-dimensional (3D) covalent organic frameworks (COFs) is essential to broaden their applications. However, the introduction of organic groups with electroactive abilities into 3D COFs is still very limited. Herein we report the first case of 3D tetrathiafulvalene-based COFs (3D-TTF-COFs) with non- or 2-fold interpenetrated pts topology and tunable electrochemical activity. The obtained COFs show high crystallinity, permanent porosity, and large specific surface area (up to 3000 m2/g). Furthermore, these TTF-based COFs are redox active to form organic salts that exhibit tunable electric conductivity (as high as 1.4 × 10-2 S cm-1 at 120 °C) by iodine doping. These results open a way toward designing 3D electroactive COF materials and promote their applications in molecular electronics and energy storage.
- Chang, Jianhong,Fang, Qianrong,Guan, Xinyu,Li, Cuiyan,Li, Daohao,Li, Hui,Li, Shanshan,Qiu, Shilun,Tang, Lingxue,Valtchev, Valentin,Xue, Ming,Yan, Yushan
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supporting information
(2019/09/06)
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- Three-dimensional conductive porous organic polymers based on tetrahedral polythiophene for high-performance supercapacitors
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Porous organic polymers have become promising electrode materials, but their low surface area and poor electrical conductivity limit their application in high-performance supercapacitors. This study reports the facile synthesis of two porous organic polymers (POP-1 and POP-2) via the condensation of tetra(4-aminophenyl)methane and 2-thenaldehyde or 2,2-bithiophene-5-carboxyaldehyde and their subsequent polymerization. The resulting porous organic polymer materials were characterized using FT-IR, 13C-NMR, X-ray single crystal diffraction, SEM, TEM and N2 adsorption-desorption measurements. This study shows that POP-2 has a diamond topological structure with a regular morphology and a wealth of pores, and a higher BET surface area (342 m2 g-1) when compared with POP-1 (260 m2 g-1). POP-2, when used as an electrode material for supercapacitors, also exhibits a much better electrochemical performance, including higher specific capacitance (332 F g-1) and better cycle stability (capacity retention rate of more than 94% after 10000 successive cycles). These results verify that the structure and electrochemical properties of porous organic polymer materials can be effectively improved by altering the monomers. This study also provides an approach for building various porous organic polymer materials for use in high-performance supercapacitors.
- Li, Tao,Zhu, Wei,Shen, Rui,Wang, Hui-Ying,Chen, Wei,Hao, Si-Jia,Li, Yunxing,Gu, Zhi-Guo,Li, Zaijun
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p. 6247 - 6255
(2018/04/23)
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- Role of higher aromatic content in modulating properties of cardanol based benzoxazines
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Mono-benzoxazine monomers based polybenzoxazines suffer from a lower crosslink density and char yield that especially is further diluted by the presence of longer alkylene chain in cardanol (C). In order to improve the crosslink density, char yield and to understand the role of higher aromatic content vs functionality, a series of cardanol-based benzoxazine monomers were synthesised. The amine condensed with cardanol and paraformaldehyde were aniline (a), 4-triphenylmethylaniline (ta), and tetra-aminophenyl methane (tapm) via solventless methodology. The C-a and C-ta are mono-benzoxazines while C-tapm is a tetra-benzoxazine monomer. The monomers were structurally characterised using FT-IR, 1H and 13C NMR spectroscopy and mass spectrometry. The ring opening polymerisation temperature (ROP) of monomers and thermal stability of resins was determined using DSC and TGA while mechanical properties were determined using rheometry. The curing kinetic study using FT-IR and DSC showed C-ta has intermediate curing behaviour between the C-a and C-tapm. The Ea for curing reaction C-a, C-ta and C-tapm was found to be 143, 126 and 70?kJ/mol. The lowest Ea for curing reaction of C-tapm (tetra-benzoxazine) is due to its highest functionality but C-ta (mono-benzoxazine) has lower Ea than C-a which can be accounted to the presence of more reactive sites provided by the additional aromatic rings in the former. It was found that the incorporation of higher aromatic ring in benzoxazine monomers is another route in enhancing the crosslink density besides higher functionality to modulate their properties.
- Shukla, Swapnil,Lochab, Bimlesh
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p. 684 - 694
(2016/08/08)
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- Microporous Organic Polyimides for CO2 and H2O Capture and Separation from CH4 and N2 Mixtures: Interplay between Porosity and Chemical Function
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Porous polyimides have been considered to be a promising material class for gas capture and sequestration, leading to the synthesis of a substantial number of individual networks with noteworthy sorption properties. In spite of these efforts, the vision of a chemical control of adsorption and desorption of small molecules, in particular, for the competing uptake of technical relevant gas mixtures, is still hardly investigated. Here, we present a systematic study of five new polyimide networks based on a set of linkers with chemical functionalities covering the full range from hydrophobic to hydrophilic interactions. The corresponding microporous organic polyimides (MOPI-I to -V) were synthesized successfully based on a condensation reaction between amino and anhydride linker molecules in m-cresol at high temperatures, resulting in cross-linking degrees beyond 95% in all cases. Argon and carbon dioxide isotherms reveal surface areas up to 940 m2/g with ultramicroporosity, about 50% microporosity and high thermal stabilities under air with decomposition temperatures up to 480 °C. Sorption screening for variable temperatures revealed remarkable uptakes for carbon dioxide up to 3.8 mmol/g and water vapor up to 19.5 mmol/g combined with a smooth gate opening around 0.25 p/p0 for MOPI-IV. In contrast, for MOPI-V the water vapor uptake decreases down to 7 mmol/g. Interestingly, the trend of the selectivities calculated by IAST and Henry does not correlate with the uptake behavior. For instance, MOPI-I and MOPI-III exhibit with 78 and 13 the highest CO2 over N2 and CH4 Henry selectivities, although their CO2 uptake is around 3.0 mmol/g. In total, we attribute the sorption properties for this class of materials mainly to the void size and shape within the ultramicroporous region. The chemical environment of the surfaces seems to have little influence on the uptake and a stronger effect on the separation behavior.
- Klumpen, Christoph,Breunig, Marion,Homburg, Thomas,Stock, Norbert,Senker, Juergen
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p. 5461 - 5470
(2016/08/19)
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- Cardanol benzoxazines-interplay of oxazine functionality (mono to tetra) and properties
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Cardanol, a sustainable origin phenol, was utilized as a reactive diluent to mediate solventless Mannich-type condensation reaction with para-formaldehyde and primary aromatic amines to form a homologous series of benzoxazine (Bz) monomers namely C-a, C-ddm, C-trisapm and C-tetraapm which differ in their degree of oxazine functionality as mono-, di-, tri- and tetra-oxazine respectively. A strong correlation is reflected between the number of oxazine rings in the monomer and the polymerization behavior, thermo-mechanical transitions, and properties of the polybenzoxazine synthesized. The monomer structure was confirmed by FTIR, 1H-, 13C-NMR spectroscopy and mass spectrometry. The curing, rheological, thermo-mechanical and thermal properties were determined using DSC, FTIR, rheometer, DMTA, LSS and TGA studies. The curing characteristic due to ROP of Bz monomers was supported both by DSC and FTIR studies. The presence of neighboring oxazine group in monomers (C-a to C-tetraapm) strongly attenuates the curing temperature (Ti = 225-140°C), enhances Tg, thermal stability, and mechanical properties. Interestingly, DFT calculations also supported the lowest curing temperature for highest oxazine functionality monomer (C-tetraapm). The interplay between the degree of oxazine functionality in the monomer; extent of H-bonding and crosslink density values in sustainable origin synthesized polybenzoxazines is suggested. The thermoset showed an increasing trend (PC-a g (58-109°C), thermal stability (355-391°C), char yield (13-37%), LOI (23-31) and storage modulus (3.6-66.5 MPa) values. The monomers are liquid to semi-viscous paste at room temperature and showed potential for solventless processing in adhesive applications.
- Shukla, Swapnil,Mahata, Arup,Pathak, Biswarup,Lochab, Bimlesh
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p. 78071 - 78080
(2015/09/28)
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- High anhydrous proton conductivity of imidazole-loaded mesoporous polyimides over a wide range from subzero to moderate temperature
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On-board fuel cell technology requires proton conducting materials with high conductivity not only at intermediate temperatures for work but also at room temperature and even at subzero temperature for startup when exposed to the colder climate. To develop such materials is still challenging because many promising candidates for the proton transport on the basis of extended microstructures of water molecules suffer from significant damage by heat at temperatures above 80 °C or by freeze below -5 °C. Here we show imidazole loaded tetrahedral polyimides with mesopores and good stability (Im@Td-PNDI 1 and Im@Td-PPI 2) exhibiting a high anhydrous proton conductivity over a wide temperature range from -40 to 90 °C. Among all anhydrous proton conductors, the conductivity of 2 is the highest at temperatures below 40 °C and comparable with the best materials, His@[Al(OH)(1,4-ndc)]n and [Zn3(H2PO4)6(H2O)3](Hbim), above 40 °C.
- Ye, Yingxiang,Zhang, Liuqin,Peng, Qinfang,Wang, Guan-E,Shen, Yangcan,Li, Ziyin,Wang, Lihua,Ma, Xiuling,Chen, Qian-Huo,Zhang, Zhangjing,Xiang, Shengchang
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supporting information
p. 913 - 918
(2015/01/30)
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- Azo-functionalized microporous organic polymers: Synthesis and applications in CO2 capture and conversion
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Azo-functionalized MOPs (Azo-MOPs) were synthesized via oxidative polymerization of aromatic amines catalyzed by t-BuOCl/NaI (25 °C, 1 h, yield: >95%), which displayed an excellent coordinating ability with a Ru complex. The resulting Ru-coordinated Azo-MOPs displayed high CO2 capacity and high performances for catalyzing the methylation of amines with CO2 under low pressure (0.5 MPa).
- Yang, Zhenzhen,Zhang, Hongye,Yu, Bo,Zhao, Yanfei,Ma, Zhishuang,Ji, Guipeng,Han, Buxing,Liu, Zhimin
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supporting information
p. 11576 - 11579
(2015/07/15)
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- A novel 3D covalent organic framework membrane grown on a porous α-Al2O3 substrate under solvothermal conditions
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A novel approach to grow a 3D COF-320 membrane on a surface-modified porous α-Al2O3 substrate is developed. A compact and uniform COF-320 membrane with a layer thickness of ~4 μm is obtained. This is the first reported 3D COF functional membrane fabricated successfully on a common porous α-Al2O3 ceramic support. The gas permeation results indicate that the gas transport behavior is mainly governed by the predicted Knudsen diffusion process due to the large nanopores of 3D COF-320.
- Lu, Hui,Wang, Chang,Chen, Juanjuan,Ge, Rile,Leng, Wenguang,Dong, Bin,Huang, Jun,Gao, Yanan
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supporting information
p. 15562 - 15565
(2015/10/29)
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- Dendrimer-type peptoid-decorated hexaphenylxylenes and tetraphenylmethanes: Synthesis and structure in solution and in the gas phase
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Branched organic nanostructures are useful scaffolds that find multiple applications in a variety of fields. Here, we present a novel approach to dendrimer-like structures. Our design contains a rigid hydrocarbon-based core (hexaphenylxylylene/tetraethynylphenylmethane) combined with a library of N-substituted oligoglycines (so-called peptoids) providing a flexible shell. The use of click chemistry allows rapid assembly of the nanostructures. The possibility of tuning the size and the solubility of this new type of nanostructure will be advantageous for future applications such as heterogeneous catalysis.
- Peschko, Katharina,Schade, Alexandra,Vollrath, Sidonie B.L.,Schwarz, Ulrike,Luy, Burkhard,Muhle-Goll, Claudia,Weis, Patrick,Br?se, Stefan
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p. 16273 - 16278
(2015/01/09)
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- Micro- and mesoporous poly(Schiff-base)s constructed from different building blocks and their adsorption behaviors towards organic vapors and CO2 gas
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Four porous poly(Schiff-base)s, PSN-DA, PSN-TAPB, PSN-TAPA and PSN-TAPM, are synthesized via one-pot condensation from 1,3,5,7-tetrakis(4-formylphenyl)adamantane with rod-like m-phenyldiamine, triangular 1,3,5-tris(4-aminophenyl)benzene and tris(4-aminophenyl)amine as well as tetrahedral tetrakis(4-aminophenyl)methane, respectively. It is found that the variation of the geometrical shape of the building blocks significantly alters the surface areas, pore sizes and distributions of the resultant porous polymers and thereby remarkably influences their adsorption behaviors towards organic vapors and CO2 gas. PSN-DA, PSN-TAPB and PSN-TAPA are microporous materials with pore sizes of 0.72, 0.95 and 1.04 nm, whereas PSN-TAPM is a micro- and mesoporous material with the major pores centered at 0.86 and 2.62 nm, respectively. Their BET surface areas are in the range from 419 to 1045 m2 g-1. At P/Po = 0.9 and 298 K, PSN-DA possesses high uptakes for both aromatic vapor (benzene, 86.1 wt%) and aliphatic vapor (cyclohexane, 77.9 wt%). In addition, the adsorption and desorption isotherms of CO2 gas in the four porous polymers are reversible-a characteristic which is convenient for the regeneration of CO2 adsorbents. Their adsorption capacities of CO2 are up to 15.0 wt% (273 K/1 bar) with the ideal selectivities of CO2/N2 and CO2/CH4 up to 71 and 14, respectively. showing potential applications in the removal of toxic organic vapors and capture of CO2 from air.
- Li, Guiyang,Zhang, Biao,Yan, Jun,Wang, Zhonggang
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supporting information
p. 18881 - 18888
(2014/12/11)
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- Three-dimensional supramolecular polymers driven by rigid tetrahedral building blocks through tetrathiafulvalene radical cation dimerization
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Rigid tetrahedral compounds T1 and T2 that bear four tetrathiafulvalene (TTF) units, which are connected to a tetraphenylmethane core by the ethynylene or amide linker were designed and prepared. Upon one-electron oxidation of the TTF units by Fe(ClO4)3, the resulting TTF+ radical cations stacked intermolecularly to give rise to three-dimensional supramolecular polymers, which were supported by UV-vis spectroscopy, cyclic voltammetry, dynamic light scattering, and scanning electron microscopy.
- Chen, Lan,Zhang, Shao-Chen,Wang, Hui,Zhou, Ya-Ming,Li, Zhan-Ting,Zhang, Dan-Wei
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p. 4778 - 4783
(2014/06/24)
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- Facile synthesis of azo-linked porous organic frameworks via reductive homocoupling for selective CO2 capture
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A facile Zn-induced reductive homocoupling reaction was used to synthesize azo-linked porous organic frameworks (azo-POFs) from easily accessed nitro monomers. Azo-POF-2 exhibits the highest CO2/N2 selectivity of 76 at 273 K among all self-coupled azo-linked porous polymers. This journal is the Partner Organisations 2014.
- Lu, Jingzhi,Zhang, Jian
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supporting information
p. 13831 - 13834
(2014/08/18)
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- Microporous polyimides with uniform pores for adsorption and separation of CO2 gas and organic vapors
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Three microporous polyimides, MPI-1, MPI-2, and MPI-3, with uniform pores were synthesized via one-pot polycondensation from tetrakis(4-aminophenyl) methane, tris(4-aminophenyl)amine and 1,3,5-tris(4-aminophenyl)benzene with pyromellitic dianhydride, respectively. The amorphous networks exhibit excellent thermal stability, large BET surface areas up to 1454 m2 g -1, and narrow pore size distribution in the range from 5 to 6 A. Their adsorption-desorption isotherms of CO2 are reversible, and the CO2 uptakes at 273 K and 1 bar are up to 16.8 wt %. Moreover, based on the ratios of initial slopes of isotherms, the CO 2/N2 and CO2/CH4 separation factors are as high as 102 and 12, respectively. The above CO2 adsorption and separation properties are attributed to the presence of abundant electron-rich heteroatoms in the polyimide networks and the unifrom ultralmicroporous structures. In addition, for MPI-1, the adsorption capacity of benzene vapor is 119.8 wt %, while the separation factors of benzene over nitrogen and water reach 342 and 28, respectively. The outstanding selective adsorptions of CO 2 gas and benzene vapor endow the microporous polyimides with promising potential in CO2 capture and separation as well as air- and water-cleaning applications.
- Li, Guiyang,Wang, Zhonggang
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p. 3058 - 3066
(2013/06/04)
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- Organic sol-gel synthesis of microporous molecular networks containing spirobifluorene and tetraphenylmethane nodes
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The microporous molecular networks based on rigid tetrafunctional units are synthesized via organic sol-gel polymerization of 2,2′,7,7′- tetraamino-9,9′-spirobifluorene (TASBF) and/or tetrakis(4-aminophenyl) methane (TAPM) with a diisocyanate, hexamethylene diisocyanate (HDI), or p-phenylene diisocyanate. This study is performed as an extension of our previous report on the first organic sol-gel method, which enabled the synthesis of microporous molecular networks via a two-stage mechanism involving the formation of colloidal dispersions of the nanoparticulate molecular networks and their subsequent growth to monolithic networks on solvent evaporation. The sol-gel-synthesized molecular networks obtained by incorporating TASBF as a network former show improved porosity, processability, and thermal stability than the TAPM-based system. The improved porosity of TASBF-based networks is attributed to higher rigidity of the spirobifluorene compared with the tetraphenylmethane units. We also demonstrate the synthesis of mixed organic molecular networks by sol-gel copolymerization of the two network formers, TASBF and TAPM, and a diisocyanate monomer. The sol-gel transformation of TASBF/TAPM/HDI occurred at longer reaction times with increasing the amount of TASBF in the TASBF/TAPM/HDI mixture. The results indicate that the organic sol-gel method can be further optimized by adjusting various synthesis parameters to create new functional organic molecular network materials.
- Moon, Su-Young,Mo, Hye-Rim,Ahn, Min-Kyoon,Bae, Jae-Sung,Jeon, Eunkyung,Park, Ji-Woong
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p. 1758 - 1766
(2013/05/09)
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- Photocurable compound
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Disclosed is a compound having a photocurable urethane (meth)acrylate group, its manufacturing method, and a photocurable composition including the compound. The compound is represented by Chemical Formulae 1 to 6. Each of Chemical Formulae 1 to 6 includes a urethane (meth)acrylate group represented by Chemical Formula 1-1 or 1-2.
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Page/Page column 20
(2012/07/27)
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- TRIARYLAMINE COMPOUNDS FOR ELECTRONIC APPLICATIONS
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This invention relates to triarylamine compounds that are useful in electronic applications. It also relates to electronic devices in which the active layer includes such a compound.
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Page/Page column 40-41
(2011/05/06)
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- Gas adsorption and gas mixture separations using porous organic polymer
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A method of separating a mixture of carbon dioxide and methane using a porous organic polymer material which includes non-planar monomeric building blocks linked by imide linkers wherein the polymer material selectively absorbs CO2. The polymer material can be chemically reduced to increase its selectivity toward CO2.
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Page/Page column 3
(2011/07/08)
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- A novel perylene diimide-based tetrahedral molecule: Synthesis, characterization and self-assembly with gold nanoparticles
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In this study, a novel tetrahedral molecule TPPY was successfully designed and synthesized. The self-assembly of TPPY with gold nanoparticles (Au NPs) in toluene has also been investigated. The aggregation morphologies of Au NPs can be controlled to produce different aggregate structures by changing the concentration of ligand TPPY. Indian Academy of Sciences.
- Li, Jun-Bo,Yu, Xiang-Lin,Fu, Jing,Liu, Xiwen,Zeng, Yang
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scheme or table
p. 839 - 846
(2011/10/04)
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- COMPOUNDS COMPRISING PARAMAGNETIC CHELATES ARRANGED AROUND A CENTRAL CORE AND THEIR USE IN MAGNETO RESONANCE IMAGING AND SPECTROSCOPY
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The present invention relates to novel compounds of formula (I) and (II), compositions comprising compounds of formula (II) and their use as contrast agents in magnetic resonance (MR) imaging (MRI) and MR spectroscopy (MRS).
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Page/Page column 32
(2009/12/02)
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- Four-fold click reactions: Generation of tetrahedral methane- and adamantane-based building blocks for higher-order molecular assemblies
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A modular concept for the generation of achiral and chiral non-racemic tetrahedral tectons from common precursors was developed. The tectons presented here are based on tetraphenylmethane or 1,3,5,7-tetraphenyladamantane core structures. They are obtained through high-yielding four-fold click reactions, using either the tetraazido or the tetraalkyne precursors. In most cases, the tetratriazoles are obtained as pure products after simple washing with water and methanol. The side chains of the tectons prepared include a self-complementary DNA dimer, obtained from a 3′-azidonucleoside and a phosphoramidite. The concept allows for a variation of the "sticky ends", leading to tecton or ligand libraries.
- Plietzsch, Oliver,Schilling, Christine Inge,Tolev, Mariyan,Nieger, Martin,Richert, Clemens,Muller, Thierry,Braese, Stefan
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supporting information; experimental part
p. 4734 - 4743
(2009/12/08)
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- Tetrahedral n-type materials: Efficient quenching of the excitation of p-type polymers in amorphous films
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Tetrahedral naphthalenediimide compound 1 has been synthesized as an example of a new class of amorphous n-type materials, in which the nondirectionality obtained by its shape is decoupled from its optoelectronic properties. 1 forms bicontinuous films with p-type polymers and effectively quenches the excited state, yielding long-lived mobile charge carriers on pulsed illumination. Copyright
- Ganesan, Palaniswamy,Yang, Xiaoniu,Loos, Joachim,Savenije, Tom J.,Abellon, Ruben D.,Zuilhof, Han,Sudhoelter, Ernst J. R.
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p. 14530 - 14531
(2007/10/03)
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- Molecular tectonics - Use of urethanes and ureas derived from tetraphenylmethane and tetraphenylsilane to build porous chiral hydrogen-bonded networks
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Tetraphenylmethane, tetraphenylsilane, and simple derivatives with substituents that do not engage in hydrogen bonding typically crystallize as close-packed structures with essentially no space available for the inclusion of guests. In contrast, derivatives with hydrogen-bonding groups are known to favor the formation of open networks that include significant amounts of guests. To explore this phenomenon, we synthesized six new derivatives 5a-5e and 6a of tetraphenylmethane and tetraphenylsilane with urethane and urea groups at the para positions, crystallized the compounds, and determined their structures by X-ray crystallography. As expected, all six compounds crystallize to form porous three-dimensional hydrogen-bonded networks. In the case of tetraurea 5e, 66% of the volume of the crystals is accessible to guests, and guests can be exchanged in single crystals without loss of crystallinity. Of special note are: (j) the use of tetrakis(4-isocyanatophenyl)methane (1f) as a precursor for making enantiomerically pure tetraurethanes and tetraureas, including compounds 5b, 5c; and (ii) their subsequent crystallization to give porous chiral hydrogen-bonded networks. Such materials promise to include chiral guests enantioselectively and to be useful in the separation of racemates, asymmetric catalysis, and other applications.
- Laliberte, Dominic,Maris, Thierry,Wuest
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p. 386 - 398
(2007/10/03)
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- A water-soluble non-aggregating fluorescent octa-carboxylic acid derived from tetraphenylmethane: Synthesis and optical properties
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The synthesis and optical properties of an octa-substituted dendritic fluorescent compound having tetraphenylmethane as the core and bithiophene as the chromophoric arms, and its water-soluble octa-carboxylic acid derivative are reported.
- Liu, Xue-Ming,He, Chaobin,Huang, Junchao
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p. 6173 - 6177
(2007/10/03)
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- ALKYLATED TETRAKIS(TRIAMINOTRIAZINE) COMPOUNDS AND PHASE CHANGE INKS CONTAINING SAME
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Disclosed are compounds of the formulae 1wherein, provided that at least one of R1, R2, R3, R4, R5, and R6 is a hydrogen atom, and provided that at least one of R1, R2, R3, R4, R5, and R6 is not a hydrogen atom, R1, R2, R3, R4, R5, and R6 each, independently of the others, is (i) a hydrogen atom, (ii) an alkyl group, (iii) an aryl group, (iv) an arylalkyl group, or (v) an alkylaryl group. Also disclosed are phase change ink compositions comprising a colorant and a phase change ink carrier comprising a material of this formula.
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- Excavations in molecular crystals
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Single crystals built from porous molecular networks can react with agents that penetrate the crystals, cleave fragments from the network, and thereby increase the volume available for guests, all without loss of crystallinity.
- Fur, Erwan Le,Demers, Eric,Maris, Thierry,Wuest, James D.
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p. 2966 - 2967
(2007/10/03)
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