20256-51-3Relevant academic research and scientific papers
Langmuir monolayers of azobenzene derivative with a urea head group
Seki, Takahiro
, p. 2807 - 2816 (1998)
An azobenzene (Az) containing amphiphile having a urea head group [N- (10-{4-[(4-hexylphenyl)azo]phenoxy})decylurea (6Az10-Urea)] was synthesized for the first time, and the spreading behavior, morphology, absorption spectral features, and photoreactivity of this amphiphile at the air-water interface was examined. The features of this monolayer were argued in comparison with those of a carboxylic acid derivative of the homologous structure. Polymer-like stable stable monolayers were formed form 6Az10-Urea both in the trans and cis forms of the Az unit, possibly indicating the formation of intermolecular bifurcated NH...O=C hydrogen bonds of urea heads. Unlike monolayers of simple long alkylureas, the present monolayer did not show a thermal phase transition within the temperature region examined (10 - 35 °C). In the trans-6Az10-Urea monolayer, the Az unit formed tilted aggregates. In this aggregation state, the trans-tocis photoisomerization in the 6Az10-Urea monolayer was completely hindered despite the fact that the monolayer was more expanded than that of a corresponding carboxylic acid derivative in which the photoisomerization proceeded.
PHOTORESPONSIVE POLYMER, BUILT-UP TYPE DIACETYLENE POLYMER, CRYSTALS OF AMMONIUM CARBOXYLATES, AND PROCESSES FOR PRODUCTION OF THEM
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Page 24; 13, (2010/02/07)
A crystal of carboxyl acid and at least one compound selected from the group consisting of amine and ammonia are mixed in an absence of a liquid medium. The carboxyl acid is conjugated diene such as (Z,Z)-muconic acid, the conjugated diene including a carboxyl group. The at least one nitrogen-containing compound selected from the group consisting of amine and ammonia is primary amine represented by RCH2NH2, where R is an aryl group, or is a normal alkyl group that contains five or more carbon atoms. Moreover, such amine that is a bivalent group and that is represented by -Ar-N=N-Ar'-, where Ar and Ar' are independently aromatic hydrocarbon bivalent groups, is intercalated in a layered crystal of a polymer such as polymuconic acid, the layered crystal including a carboxyl group. In this way, a novel photoresponsive polymer is obtaind.Also obtained is a crystal of ammonium carboxylate including at least one kind of carboxyl acid and at least one kind of amine, at least one kind of compound selected from (i) the at least one kind of carboxyl acid and (ii) the at least one kind of amine being a diacetylene derivative. The crystal of ammonium carboxylate is subjected to light or heat, to obtain a built-up type diacetylene polymer.
