- Tetrahedral anion cage: Self-assembly of a (PO4) 4L4 complex from a tris(bisurea) ligand
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A C3-symmetric tris(bisurea) ligand L assembles with PO 43- ions to form the tetrahedral cage [(PO 4)4L4]12-. The PO4 3- ions form the four vertices and each forms 12 N-H?O hydrogen bonds with 6 urea groups. A unique trinuclear pinwheel-like helical complex [(SO4)3L2]6- is formed from L and SO42- ions (see picture). Copyright
- Wu, Biao,Cui, Fengjuan,Lei, Yibo,Li, Shaoguang,De Sousa Amadeu, Nader,Janiak, Christoph,Lin, Yue-Jian,Weng, Lin-Hong,Wang, Yao-Yu,Yang, Xiao-Juan
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Read Online
- Triphenylamine based lab-on-a-molecule for the highly selective and sensitive detection of Zn2+ and CN- in aqueous solution
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Simple dual sensing of Zn2+ and CN- was reported for the first time using the triphenylamine based lab-on-a-molecule TATP in both UV-Vis and fluorescence channels over other tested ions. Meanwhile, the sensing mechanism for both title ions was further studied using NMR titration and DFT calculations.
- Sun, Shichao,Shu, Qinghai,Lin, Pengchao,Li, Yanyue,Jin, Shaohua,Chen, Xin,Wang, Dequan
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Read Online
- The 'Trinity' helix: Synthesis and structural characterisation of a C3-symmetric tris-bidentate ligand and its coordination to Ag(I)
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The synthesis and structural characterisation of a novel C3-symmetric tris-bidentate ligand, L, featuring a triphenylamine core appended by pyridylimine coordination sites is reported: 1H NMR compleximetric titration studies with Ag(I) and ESMS indicate the presence of [Ag3L2]3+ species in solution, consistent with the formation of a trinuclear double helicate complex: the Trinity helix.
- Conerney, Brian,Jensen, Paul,Kruger, Paul E.,MacGloinn, Conchueir
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Read Online
- Chirality transcription in the anion-coordination-driven assembly of tetrahedral cages
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Enantiopure A4L4 tetrahedral cages (either ΔΔΔΔ or ΛΛΛΛ) were obtained through the anion-coordination-driven assembly (ACDA) of phosphate anions with C3-symmetric tris-bis(urea) ligands bearing chiral groups.
- Fu, Jin,Wu, Biao,Yang, Xiao-Juan,Zhang, Dan,Zhang, Huizheng,Zhang, Wenyao,Zhao, Yanxia,Zheng, Bo
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Read Online
- Tr?ger's base functionalized recyclable porous covalent organic polymer (COP) for dye adsorption from water
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Protection of the environment from the increasing threats of pollution from several chemical industries in a sustainable way has become a major global challenge. The colored effluents from the textile and dyestuff industries are major sources of pollution, contaminating water bodies. Herein, we have synthesized a covalent organic polymer TBTPACOP having a V-shaped Tr?ger's base unit in the framework with the notion that the unique cleft like architecture of TB will infuse porosity and robustness in the amorphous polymeric material. The covalent organic polymer (COP) was used for the adsorption of anionic acid dyes from aqueous effluent. The equilibrium adsorption capacity (qe) was found to be 188.96 mg g-1. The excellent dye adsorption capacity of the COP, adsorbing 95% of an acid dye (Acid Orange II) at room temperature within 70 min, along with its recyclability up to 4 consecutive cycles, makes TBTPACOP an extremely promising material for selective and efficient removal of acid dyes from aqueous effluent.
- Jejurkar, Valmik P.,Yashwantrao, Gauravi,Saha, Satyajit
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p. 12331 - 12342
(2020/07/30)
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- Trismaleimide Dendrimers: Helix-to-Superhelix Supramolecular Transition Accompanied by White-Light Emission
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Reported here are unprecedented fluorescent superhelices composed of primary, supramolecular polymers of the opposite helical twist. A new class of functional dendrimers was synthesized by amino-ene click reactions, and they demonstrate an alternating OFF/ON fluorescence with generation growth. A peripherally alkyl-modified dendrimer displays helix-sense-selective supramolecular polymerization, which predominantly forms right-handed (or left-handed) helical supramolecular polymers in the solution containing chiral solvents. With increasing the concentration, these primary helical supramolecular polymers spontaneously twist around themselves in the opposite direction to form superhelical structures. Atomic force microscopy and circular dichroism measurements were used to directly observe the helix-to-superhelix transition occurring with a reversal in the helical direction. Exceptional white-light emission was observed during superhelix formation.
- Li, Fen,Li, Xiaohui,Wang, Ying,Zhang, Xin
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p. 17994 - 18002
(2019/11/13)
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- Temperature Control of Sequential Nucleation–Growth Mechanisms in Hierarchical Supramolecular Polymers
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Upon cooling insolution, chiral triarylamine tris-amide unimers produce organogels by stacking into helical supramolecular polymers, which subsequently bundle into larger fibers. Interestingly, circular dichroism, vibrational circular dichroism, and AFM imaging of the chiral self-assemblies revealed that monocolumnar P-helical fibrils formed upon fast cooling, whereas bundled M-superhelical fibers formed upon slow cooling. The mechanistic study of this structural bifurcation reveals the presence of a strong memory effect, reminiscent of a complex stepwise combination of primary and secondary nucleation-growth processes. These results highlight the instrumental role of sequential self-assembly processes to control supramolecular architectures of multiple hierarchical order.
- Osypenko, Artem,Moulin, Emilie,Gavat, Odile,Fuks, Gad,Maaloum, Mounir,Koenis, Mark A. J.,Buma, Wybren Jan,Giuseppone, Nicolas
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p. 13008 - 13016
(2019/09/13)
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- Covalently Trapped Triarylamine-Based Supramolecular Polymers
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C3-Symmetric triarylamine trisamides (TATAs), decorated with three norbornene end groups, undergo supramolecular polymerization and further gelation by π–π stacking and hydrogen bonding of their TATA cores. By using subsequent ring-opening metathesis polymerization, these physical gels are permanently crosslinked into chemical gels. Detailed comparisons of the supramolecular stacks in solution, in the physical gel, and in the chemical gel states, are performed by optical spectroscopies, electronic spectroscopies, atomic force microscopy, electronic paramagnetic resonance spectroscopy, X-ray scattering, electronic transport measurements, and rheology. The results presented here clearly evidence that the core structure of the functional supramolecular polymers can be precisely retained during the covalent capture whereas the mechanical properties of the gels are concomitantly improved, with an increase of their storage modulus by two orders of magnitude.
- Liang, Ting,Collin, Dominique,Galerne, Melodie,Fuks, Gad,Vargas Jentzsch, Andreas,Maaloum, Mounir,Carvalho, Alain,Giuseppone, Nicolas,Moulin, Emilie
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p. 14341 - 14348
(2019/11/03)
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- Catalytic hydrogenation of carbonyl and nitro compounds using an [: N, O] -chelate half-sandwich ruthenium catalyst
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A series of N,O-chelate half-sandwich ruthenium complexes for both carbonyl and nitro compound hydrogenation have been synthesized based on β-ketoamino ligands. All complexes exhibited high activity for the catalytic hydrogenation of a series of ketones and nitroarenes with molecular H2 as the reducing reagent in aqueous medium. Consequently, the catalytic system showed the catalytic TON values of 950 for 1-phenylethanol in acetophenone hydrogenation and 1960 for 1-chloro-4-nitrobenzene in p-chloroaniline hydrogenation. Good catalytic activity was displayed for various kinds of substrates with either electron-donating or electron-withdrawing groups. The neutral ruthenium complexes 1-4 were fully characterized using NMR, IR, and elemental analysis. Molecular structures of complexes 2 and 4 were further confirmed using single-crystal X-ray diffraction analysis.
- Yao, Zi-Jian,Zhu, Jing-Wei,Lin, Nan,Qiao, Xin-Chao,Deng, Wei
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p. 7158 - 7166
(2019/06/13)
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- Synthesis and optical properties of redox-active triphenylamine-based derivatives with methoxy protecting groups
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A series of novel redox-active triphenylamine-based materials, 4,4′-bis(4,4′-dimethoxydiphenylaminyl)-4′′-methoxytriphenylamine (BDATPA) and four related derivatives, including tris(4-methoxyphenyl)amine (TPA), N,N,N′,N′-tetrakis(4-methoxyphenyl)-1,4-phenylenediamine (TPPA), N,N,N′,N′-tetrakis(4-methoxyphenyl)-1,1′-biphenyl-4,4′-diamine (TPB) and tris(4-(4,4′-dimethoxyphenylaminyl)phenyl)amine (TPAPA), were readily prepared and their electrochemical, photoluminescence (PL) and electrochromic (EC) behaviors were investigated. Interestingly, only TPB exhibited high PL intensities in both solution and solid state, while the others revealed a much lower PL intensity in solution. All of these electroactive materials showed excellent electrochemical reversibility by cyclic voltammetry scanning with multi-color changes at the related oxidation states. Furthermore, UV-Vis and spectroelectrochemical measurements were also applied to evaluate and calculate the molar extinction coefficients in order to facilitate these materials as a color palette.
- Wu, Jung-Tsu,Hsiang, Ting-Lin,Liou, Guey-Sheng
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p. 13345 - 13351
(2019/01/03)
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- Strategic design of triphenylamine- and triphenyltriazine-based two-dimensional covalent organic frameworks for CO2 uptake and energy storage
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Hexagonally ordered covalent organic frameworks (COFs) are interesting new crystalline porous materials that have massive potential for application in gas storage. Herein, we report the synthesis of two series of two-dimensional hexagonally ordered COFs - TPA-COFs and TPT-COFs - through one-pot polycondensations of tris(4-aminophenyl)amine (TPA-3NH2) and 2,4,6-tris(4-aminophenyl)triazine (TPT-3NH2), respectively, with triarylaldehydes featuring different degrees of planarity, symmetry, and nitrogen content. All the synthesized COFs exhibited high crystallinity, large BET surface areas (up to 1747 m2 g-1), excellent thermal stability, and pore size distributions from 1.80 to 2.55 nm. The symmetry and planarity of the monomers strongly affected the degrees of crystallinity and the BET surface areas of the resultant COFs. In addition, these COFs displayed excellent CO2 uptake efficiencies of up to 65.65 and 92.38 mg g-1 at 298 and 273 K, respectively. The incorporation of the more planar and higher-nitrogen-content triaryltriazine unit into the backbones of the TPA-COFs and TPT-COFs enhanced the interactions with CO2, leading to higher CO2 uptakes. Moreover, the synthesized COFs exhibited electrochemical properties because of their conjugated structures containing redox-active triphenylamine groups. This study exposes the importance of considering the symmetry and planarity of the monomers when designing highly crystalline COFs; indeed, the structures of COFs can be tailored to vary their functionalities for specific applications.
- El-Mahdy, Ahmed F. M.,Kuo, Cheng-Han,Alshehri, Abdulmohsen,Young, Christine,Yamauchi, Yusuke,Kim, Jeonghun,Kuo, Shiao-Wei
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p. 19532 - 19541
(2018/10/24)
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- Schiff bases containing triphenylamine and pyrrole units: Synthesis and electrochromic, acidochromic properties
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Five Schiff bases (SBs) containing pyrrole and different triphenylamine (TPA) moieties were synthesized and the structures were confirmed by infrared spectroscopy (IR) and the nuclear magnetic resonance (NMR) technique. SB1 exhibited intense fluorescence emission in contrast to SB2-SB5. The electrochemical behaviors of the SBs were investigated by the cyclic voltammetry (CV) technique. SB2-SB5 exhibited redox stability with one well-defined and reversible redox couple upon electrochemical oxidation. On the contrary, SB1 revealed two oxidation peaks and one reduction peak in the first CV curve, followed by four well-defined redox couples in the steady-state CV curves. Electrochromic behaviors of the SBs have been observed, accompanied with a new absorption peak appearing with obvious color change from pale yellow neutral form to red oxidation form. SB1-SB5 also displayed sensitive acidochromic behaviors, and a linear dependence of maximum absorption wavelength as a function of pH values has been observed which proved the SBs could be used as alternative pH sensors in the given range.
- Li, Yu,Zhang, Yanhong,Niu, Haijun,Wang, Cheng,Qin, Chuanli,Bai, Xuduo,Wang, Wen
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p. 5245 - 5254
(2016/07/06)
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- Hexa glycidyl triamino triphenylamine preparation method
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The present invention discloses a hexa glycidyl triamino triphenylamine preparation method, TNTPA as a raw material is reduced into TATPA in a 95% ethanol system in the presence of catalyst FeCl3 /activated carbon by drop-wise addition of 85% hydrazine hydrate, then the TATPA and epihalohydrin are used as main raw materials for first step reaction in the presence of water, then excess epichlorohydrin is recovered, second step reaction is performed in an inert organic solvent under the effect of an alkali metal hydroxide aqueous solution, and powdery high-purity HGTATPA (hexa glycidyl triamino triphenylamine) can be prepared by washing with water, separating, vacuum devolatilization, organic solvent recrystallization and the like. The hexa glycidyl triamino triphenylamine preparation method is simple in steps, friendly in working conditions, mild in reaction conditions, free of special equipment requirements, namely, free of high temperature and high pressure, corrosion protection measures and the like, better in product quality, and higher in yield.
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Paragraph 0035; 0036; 0037; 0041; 0042
(2016/10/20)
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- Triphenylamine derivative and preparation method thereof
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The invention relates to a triphenylamine derivative and a preparation method thereof, and belongs to the detection field of anions and cations. The structural formula of the triphenylamine derivative L is shown in the specification. The triphenylamine derivative disclosed by the invention can be used for qualitative and quantitative detection on Hg2+ and CN- with high efficiency, rapidness, selectivity and sensitivity in an aqueous system.
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Paragraph 0043; 0044; 0045
(2016/11/02)
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- Healable supramolecular polymers as organic metals
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Organic materials exhibiting metallic behavior are promising for numerous applications ranging from printed nanocircuits to large area electronics. However, the optimization of electronic conduction in organic metals such as charge-transfer salts or doped conjugated polymers requires high crystallinity, which is detrimental to their processability. To overcome this problem, the combination of the electronic properties of metal-like materials with the mechanical properties of soft self-assembled systems is attractive but necessitates the absence of structural defects in a regular lattice. Here we describe a one-dimensional supramolecular polymer in which photoinduced through-space charge-transfer complexes lead to highly coherent domains with delocalized electronic states displaying metallic behavior. We also reveal that diffusion of supramolecular polarons in the nanowires repairs structural defects thereby improving their conduction. The ability to access metallic properties from mendable self-assemblies extends the current understanding of both fields and opens a wide range of processing techniques for applications in organic electronics.
- Armao, Joseph J.,Maaloum, Mounir,Ellis, Thomas,Fuks, Gad,Rawiso, Michel,Moulin, Emilie,Giuseppone, Nicolas
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p. 11382 - 11388
(2014/09/30)
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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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- Structural effect on the resistive switching behavior of triphenylamine-based poly(azomethine)s
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Linear and hyperbranched poly(azomethine)s (PAMs)-based on triphenylamine moieties are synthesized and used as the functioning layers in the Ta/PAM/Pt resistive switching memory devices. Comparably, the hyperbranched PAM with isotropic architecture and semi-crystalline nature shows enhanced memory behaviors with more uniform distribution of the HRS and LRS resistances.
- Zhang, Wenbin,Wang, Cheng,Liu, Gang,Wang, Jun,Chen, Yu,Li, Run-Wei
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supporting information
p. 11496 - 11499
(2015/06/02)
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- Polyrotaxane frameworks containing N,N′,N″-(4,4′, 4″-nitrilotris(4,1-phenylene))triisonicotinamide: Structural and luminescent properties
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The reaction of a C3-symmetric tridentate ligand, N,N′,N″-(4,4′,4″-nitrilotris(4,1-phenylene)) triisonicotinamide (L), with various d10-metal salts of CuI, Cu(SCN), and M(ClO4)2 (M = Zn, Cd) led to four metal-organic materials of {[(Cu2I2)(L)2] ·4DMF·2MeOH}n (1), {[Cu(L)2(NCS) 2]·3DMF}n (2), and {[M(L)2(ClO 4)2]·4EtOH}n (M = Zn 3 and Cd 4), respectively, which have been isolated and structurally characterized by X-ray diffraction studies. The X-ray analysis revealed that the interlocking of the 1-D double-zigzag chains of 1-4 into the macrocycles of the adjacent chains generates a novel 2-D (1-D → 2-D) polyrotaxane framework. In these 2-D polyrotaxane frameworks, the C3-symmetric tridentate ligand, L, only adopts a μ2-bridging mode, and the third arm is free. In addition, 1-4 are all emissive with dual emissions (431-452 and 558-570 nm) in the solid state at room temperature and at 77 K, which are suggested to be due to an intraligand transition of L based on the high similarities in emission energies to that of L.
- Tzeng, Biing-Chiau,Chao, An,Selvam, Tamilselvi,Chang, Tsung-Yi
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p. 5337 - 5344
(2013/09/02)
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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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- Amino surface-functionalized tris(calix[4]arene) dendrons with rigid C 3-symmetric propeller cores
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Dendrons composed of three functionalized cone calix[4]arene substructures covalently bound to rigid C3-symmetric tris-anilino cores through amide linkages have been obtained by a divergent synthetic protocol involving the coupling of p-nitrocalix[4]arene butanoic acid 9 with tris(4-aminophenyl) amine (TAPA), 1,3,5-tris(4-aminophenyl)benzene (TAPB), and 2,4,6-tris(4- aminophenyl)-s-triazine (TAPT). Two different amidation procedures were used to generate the dodecanitro intermediates (through activation of acid 9 with PyBOP catalyst or transformation into its acid chloride). The final reduction to the title dodecaamino dendrons was smoothly carried out with H2 and Raney-Ni catalyst.
- Gattuso, Giuseppe,Grasso, Giulia,Marino, Nino,Notti, Anna,Pappalardo, Andrea,Pappalardo, Sebastiano,Parisi, Melchiorre F.
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p. 5696 - 5703
(2011/11/29)
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- NEAR-INFRARED ABSORBING FILM COMPOSITIONS
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A curable liquid formulation containing at least (i) one or more near-infrared absorbing triphenylamine -based dyes, and (ii) one or more casting solvents. The invention is also directed to solid near- infrared absorbing films composed of crosslinked forms of the curable liquid formulation. The invention is also directed to a microelectronic substrate containing a coating of the solid near-infrared absorbing film as well as a method for patterning a photoresist layer coated on a microelectronic substrate in the case where the near-infrared absorbing film is between the microelectronic substrate and a photoresist film.
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Page/Page column 28
(2011/04/13)
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- Simpler and more efficient strategy to stabilize the chromophore orientation in electro-optic polymers with copper-free thermal Huisgen reaction
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A new strategy is proposed to stabilize the electro-optic (EO) activity of second-order materials using copper-free thermal Huisgen 1,3-dipolar cross-linking reaction. It consists in freezing the chromophores orientation after the poling process by a cross-linking reaction based on the 1,3-dipolar cycloaddition between an azide and an alkyne. To reach this goal, the synthesis of new methacrylate type polymers bearing a derivative of Disperse Red 1 chromophore was performed. The polymeric structure is bearing a cross-linkable function on its backbone and the complementary reactive function is brought by a small molecule called "doping agent" (DA), containing several complementary cross-linking groups, evenly distributed in the polymer film. Materials have been prepared and exhibit large second-order nonlinear optical coefficients (d33) up to 60 pm/V at the fundamental wavelength of 1064 nm. Moreover, the thermal stability of the orientation of the chromophores could reach 150 °C upon cross-linking with such materials, which is higher than previously described cross-linkable EO polymers based on this reaction. Furthermore, this new strategy widens the possibilities offered by copper-free thermal Huisgen 1,3-dipolar cycloaddition as cross-linking reaction for EO polymers.
- Cabanetos, Clément,Blart, Errol,Pellegrin, Yann,Montembault, Véronique,Fontaine, Laurent,Adamietz, Frédéric,Rodriguez, Vincent,Odobel, Fabrice
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scheme or table
p. 2286 - 2294
(2012/05/05)
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- Self-assembled organogels based on two-component system
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Organogels were produced by the self-assembly of two organogelators, 3,5-bis(dodecanoylamino)benzoic acid and aromatic amines, in nonaromatic hydrocarbon solvents, through hydrogen bonding, aromatic stacking, and van der Waals interactions. 3,5-Bis(dodecanoylamino)benzoic acid has one carboxylic acid group for hydrogen bonding with amines and two alkylamide groups that can participate in interlayer hydrogen bonding and van der Waals interactions. The shape and size of the aromatic amines have a significant effect on the gel properties as well as their structures. A variety of organogels were realized by forming complexes of 3,5-bis(dodecanoylamino)benzoic acid and various amines with an aromatic group in nonaromatic hydrocarbon solvents.
- Nam, Seong Ryong,Lee, Ho Yong,Hong, Jong-In
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p. 10531 - 10537
(2008/12/23)
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- Multi-maleimides bearing electron-donating chromophores: Reversible fluorescence and aggregation behavior
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A(=)-D, [A(=)]2-D and [A (=)]3-D multi-maleimides and multi-itaconimides bearing electron-donating chromophores display a strong fluorescence quenching due to an intramolecular charge-transfer interaction. The electron-accepting C=C bond plays a key role in the intramolecular quenching. For the isomerization of these multi-itaconimides and Michael additions of these multi-maleimides, their emission behavior is irreversible. For the Diels-Alder additions of these multi-maleimides, their emission behavior is reversible due to the reversible opening and closing of intramolecular charge-transfer pathway. Tris-maleimide TMPA peripherally modified with furfural alcohol displays not only reversible fluorescence behavior but also reversible aggregation behavior. Copyright
- Zhang, Xin,Li, Zi-Chen,Li, Kai-Bo,Du, Fu-Sheng,Li, Fu-Mian
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p. 12200 - 12201
(2007/10/03)
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- Linear 1,4-coupled oligoanilines of defined length: Preparation and spectroscopic properties
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A facile synthetic method involving SNAr coupling of 4-fluoronitrobenzene to arylamines, followed by reduction of the nitro groups, has been developed. The method allows the preparation of symmetric (NH 2/ NH2 end-capped) and asymmetric (Ph/NH2 end-capped) oligoanilines of even or odd chain lengths. The preparation of the NH2/NH2 end-capped trimer to octamer and Ph/NH2 end-capped trimer to pentamer is described. The effect of the chain length on the spectroscopic properties of the oxidized oligomers has been investigated by UV-Vis-NIR spectroscopy.
- Rozalska, Izabela,Kulyk, Paulina,Kulszewicz-Bajer, Irena
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p. 1235 - 1243
(2007/10/03)
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- A metallosupramolecular tetrahedron with a huge internal cavity
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A huge molecular tetrahedral complex forms quantitatively by self-assembly from four ligands L-H6 and four titanium-(IV) ions; in the solid state it encapsulates four {K(DMF)3}+ units in its interior.
- Albrecht, Markus,Janser, Ingo,Meyer, Sebastian,Weis, Patrick,Froehlich, Roland
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p. 2854 - 2855
(2007/10/03)
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- Compounds exhibiting thrombopoietin-like activities
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The compounds of the invention are compounds represented by the following general formula (1): wherein E represents one selected from the group consisting of a methylidyne group and a nitrilo group, R1 represents one selected from the group consisting of optionally substituted aryl groups and optionally substituted heteroaryl groups, R2 represents one selected from the group consisting of a hydrogen atom and alkyl groups, W1 represents an amino acid residue, A represents one selected from the group consisting of a carbonyl group and a sulfonyl group, X1 represents one selected from the group consisting of optionally substituted alkylene groups and optionally substituted alkenylene groups, and p represents 0 or 1; and their pharmacologically acceptable salts, which exhibit thrombopoietin-like activity.
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- Synthesis of Azapolycyclic Systems Based on the Indolizino[3,4-b]quinoline Skeleton - A Diastereoselective Entry to Potential Oligodentate Artificial Receptors
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A convenient diastereoselective synthetic route to the molecular tweezer bis(indolizino[3,4-b]quinolyl)methane 9 and the rigid indolizino[7′,8′:2,3]quinolino[8,7-h]indolizino[8,7-b]quinolines 14, 15 as potential receptor molecules has been developed, involving double imine condensation followed by Lewis acid catalyzed biscyclization of prolinal-derived bis-(imines) 8 and 13, respectively. Whereas the use of SnCl4 leads to the formation of the planar polycycle 15, the corresponding concave product 14 is formed in the presence of EtAlCl2. Both compounds 14, 15, as well as tweezer 9 have been characterized by X-ray crystal-structure analysis. Although tris(imines) 20, 24 derived from 1,3,5-triaminobenzene (18) and tris(4-aminophenyl)amine (23) could be obtained similarly by molecular sieve-catalyzed condensation, the corresponding triscyclization could not be achieved. However, by attaching preformed indolizino[3,4-b]quinoline subunits 25 and 31 to an aromatic core, the bidentate receptors 30, 33 and the tentacle molecule 28 were accessible.
- Temme, Oliver,Dickner, Tim,Laschat, Sabine,Froehlich, Roland,Kotila, Sirpa,Bergander, Klaus
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p. 651 - 659
(2007/10/03)
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