- Preparation method of aliphatic ring bridged aromatic diamine monomer
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The invention relates to a preparation method of an aliphatic ring bridged aromatic diamine monomer, and belongs to the technical field of preparation of diamine monomers for polyimide. According to the preparation method of the aliphatic ring bridged aromatic diamine monomer, cycloalkyl ketone and amine are used as raw materials, methylbenzene is used as an entrainer, a nucleophilic reaction is performed under the action of perfluorosulfonic acid resin/SiO2 solid acid catalyst, and then after-treatment is performed to obtain the aliphatic ring bridged aromatic diamine monomer. According to the method, the reaction temperature is reduced, the reaction time is shortened, the reaction yield is increased, the toxicity of after-treatment is reduced, the production cost is reduced, and the application range is wide.
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Paragraph 0063; 0064; 0069; 0070
(2020/05/14)
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- Intermolecular London Dispersion Interactions of Azobenzene Switches for Tuning Molecular Solar Thermal Energy Storage Systems
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The performance of molecular solar thermal energy storage systems (MOST) depends amongst others on the amount of energy stored. Azobenzenes have been investigated as high-potential materials for MOST applications. In the present study it could be shown that intermolecular attractive London dispersion interactions stabilize the (E)-isomer in bisazobenzene that is linked by different alkyl bridges. Differential scanning calorimetry (DSC) measurements revealed, that this interaction leads to an increased storage energy per azo-unit of more than 3 kcal/mol compared to the parent azobenzene. The origin of this effect has been supported by computation as well as X-ray analysis. In the solid state structure attractive London dispersion interactions between the C?H of the alkyl bridge and the π-system of the azobenzene could be clearly assigned. This concept will be highly useful in designing more effective MOST systems in the future.
- Kunz, Anne,Heindl, Andreas H.,Dreos, Ambra,Wang, Zhihang,Moth-Poulsen, Kasper,Becker, Jonathan,Wegner, Hermann A.
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p. 1145 - 1148
(2019/08/21)
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- Guanidine-guanidinium cooperation in bifunctional artificial phosphodiesterases based on diphenylmethane spacers; Gem -dialkyl effect on catalytic efficiency
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Diphenylmethane derivatives 1-3, decorated with two guanidine units, are effective catalysts of HPNP transesterification. Substitution of the methylene group of the parent diphenylmethane spacer with cyclohexylidene and adamantylidene moieties enhances catalytic efficency, with gem-dialkyl effect accelerations of 4.5 and 9.1, respectively. Activation parameters and DFT calculations of the rotational barriers around the C-Ar bonds indicate that a major contribution to the driving force for enhanced catalysis is entropic in nature.
- Salvio, Riccardo,Mandolini, Luigi,Savelli, Claudia
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p. 7259 - 7263
(2013/08/23)
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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 43
(2011/05/06)
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- Basic azo dyestuffs of the 3-cyano-2,4,6-triamino pyridine series
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The new basic azo dyestuffs of the formula STR1 wherein the symbols have the meaning given in the description, are suitable for dyeing synthetic and naturally occurring substrates which can be dyed with basic dyestuffs.
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- Process for preparing diaminodiphenyl-alkanes
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A process is described for the preparation of bis(aminophenyl)alkanes and bis(aminophenyl)cycloalkanes which comprises condensing a m-alkylphenol with an alkanone or cycloalkanone and heating the resulting condensation product with an at least stoichiometric amount of an acid addition salt of aniline or a substituted aniline or a mixture of such amines.
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