Synthesis of Amorphous Molecular Materials with Multiple Azobenzene Units by Palladium-Catalyzed Amination and their Photochromism
作者:
A. Honma,
T. Kanbara,
K. Hasegawa,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 2000)
卷期:
Volume 345,
issue 1
页码: 125-130
ISSN:1058-725X
年代: 2000
DOI:10.1080/10587250008023906
出版商: Taylor & Francis Group
关键词: triarylamine;amorphous;isomerization;azobenzene
数据来源: Taylor
摘要:
New photochromic amorphous molecules containing core of triphenylamine and three branches of azobenzene were obtained in good yields by Pd-catalyzed amination. High glass temperature (Tg) above 100°C of these molecules was because of many triphenylamine units and high molecular weight. The stable amorphous films of these molecules could be easily prepared by spin-coated method. The photoinduced and thermal isomerization were observed in the amorphous films and the solutions. The size of the core had no clear effect on rates and activation energy values (Ea) of the cis→trans thermal isomerization in solution.
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