- A novel nitrogen rich porous aromatic framework for hydrogen and carbon dioxide storage
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A nitrogen rich, p-phenylenediamine based, porous aromatic framework (NPAF) with 1790 m2 g-1 BET surface area has been synthesized by using a Yamamoto coupling technique. The NPAF has shown a hydrogen uptake of 1.87 and 0.33 wt% at 7
- Demirocak, Dervis Emre,Ram, Manoj K.,Srinivasan, Sesha S.,Goswami, D. Yogi,Stefanakos, Elias K.
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- Controlling Multiphoton Absorption Efficiency by Chromophore Packing in Metal-Organic Frameworks
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Coordination polymers show great potential for the tailored design of advanced photonic applications by employing crystal chemistry concepts. One challenge for achieving a rational design of nonlinear optically active MOF materials is deriving fundamental structure-property relations of the interplay between the photonic properties and the spatial arrangements of optically active chromophores within the network. We here investigate two-photon-absorption (TPA)-induced photoluminescence of two new MOFs based on a donor-acceptor tetraphenylphenylenediamine (tPPD) chromophore linker (H4TPBD) and Zn(II) and Cd(II) as metal centers. The TPA efficiencies are controlled by the network topologies, degree of interpenetration, packing densities, and the specific spatial arrangement of the chromophores. The effects can be rationalized within the framework of established excited-state theories of molecular crystals. The results presented here demonstrate the key effect of chromophore orientation on the nonlinear optical properties of crystalline network compounds and allow for establishing quantitative design principles for efficient TPA materials.
- Mayer, David C.,Manzi, Aurora,Medishetty, Raghavender,Winkler, Benedikt,Schneider, Christian,Kieslich, Gregor,P?thig, Alexander,Feldmann, Jochen,Fischer, Roland A.
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- An electroluminescent compound and an electroluminescent device comprising the same
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The present invention relates to: a novel organic light emitting compound represented by chemical formula I, which is used as a material for an organic material layer such as a light emitting layer, a hole transport layer, an electron transport layer, an electron blocking layer, and a light efficiency improvement layer in an organic light emitting device, so that it is possible to realize remarkably excellent luminous efficiency and luminous properties such as quantum efficiency; and the organic light emitting device comprising the same.
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Paragraph 0161-0164
(2021/02/05)
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- Synthesizing method of tetracarboxylic acid N,N,N',N'-tetra-(4'-carboxyl biphenyl)-1,4-phenylenediamine
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The invention relates to a synthesizing method of tetracarboxylic acid N,N,N',N'-tetra-(4'-carboxyl biphenyl)-1,4-phenylenediamine. The synthesizing method comprises the following steps of enabling 1,4-benzene dibromide and diphenylamine to generate N,N,N',N'-tetraphenyl-1,4-phenylenediamine (A) through arylamination reaction; enabling the N,N,N',N'-tetraphenyl-1,4-phenylenediamine (A) and NBS (N-bromosuccinimide) to generate N,N,N',N'-tetra-(4-bromophenylacetone)-1,4-phenylenediamine (B); enabling the N,N,N',N'-tetra-(4-bromophenylacetone)-1,4-phenylenediamine (B) and 4-methyl boronobenzoate to generate N,N,N',N'-tetra-(4'-methoxycarbonyl biphenyl)-1,4-phenylenediamine (C); hydrolyzing the N,N,N',N'-tetra-(4'-methoxycarbonyl biphenyl)-1,4-phenylenediamine (C), so as to generate a target compound D, namely N,N,N',N'-tetra-(4'-carboxyl biphenyl)-1,4-phenylenediamine. The synthesizing method has the advantages that the poly-benzene ring aromatic tetracarboxylic acid compound not reported in literature is synthesized; the synthesizing method is simple, the cost is low, the yield rate is high, and the purity is high. The target compound is shown as a formula shown in the attached figure.
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- Quaternary carboxylic acid N, N, N', four N' - (4 - carboxyl vinyl phenyl) - 1, 4 - phenylenediamine synthetic method (by machine translation)
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The invention of a four-membered carboxylic acidN,N,N',N' - Four (4 - carboxyl vinyl phenyl) - 1, 4 - phenylenediamine synthetic method, 1, 4 - bromobenzene with two passes the amination reaction of the diphenylamineN,N,N',N' - Tetraphenyl - 1, 4 - phenyl
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- Substituted Triarylamine Cation-Radical Redox Systems - Synthesis, Electrochemical and Spectroscopic Properties, Hammet Behavior, and Suitability as Redox Catalysts
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21 triarylamines (1n - 1z, 1za, 1zb) and triarylamine analogs (2a, 2b, 3a, 3b, 4a, 4b) with substituents in at least all three p positions and some of their cation-radical hexachloroantimonates have been synthesized.The electrochemical behavior has been studied by cyclic voltammetry.Most of the compounds show chemically and electrochemically reversible first oxidation waves in the formation of the cation radicals.With the exception of 4a and 4b, the second wave for the formation of the dication is chemically irreversible.The UV spectra of the triarylamine cation radicals have been obtained in the presence of a slight excess of SbCl5.A good Hammett correlation between the first anodic potential of only p-substituted triarylamines and the ?/?+ values has been established.Some redox-catalytic properties of triarylamine cation radicals are described. Key Words: Triarylamines / Cation radicals / Electrochemistry / Redox catalysts / Voltammetry, cyclic
- Dapperheld, Steffen,Steckhan, Eberhard,Grosse Brinkhaus, Karl-Heinz,Esch, Thomas
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p. 2557 - 2568
(2007/10/02)
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- Convenient Syntheses of 2-Nitrophenylsulfen-(NPS-)imines by Oxidation of NPS-Protected Amines and Amino Acid Derivatives
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2-Nitrophenylsulfenimines 2 of large structural variety are easily available from 2-nitrophenylsulfenamides 1, by direct and indirect electrochemical oxidation or by using stoichiometric amounts of a triarylamine radical cation salt.In most cases the dire
- Heyer, Joachim,Dapperheld, Steffen,Steckhan, Eberhard
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p. 1617 - 1624
(2007/10/02)
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