Synthesis and optical characterization of novel imidazole-based azo materials

被引：15

作者：

Fukuda, N ^{[1
]}

Kim, JY ^{[1
]}

Fukuda, T ^{[1
]}

Ushijima, H ^{[1
]}

Tamada, K ^{[1
]}

机构：

[1] Natl Inst Adv Sci & Technol, Photon Res Inst, Tsukuba, Ibaraki 3058565, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS | 2006年 / 45卷 / 1B期

关键词：

imidazole-based azo materials; hydrogen bonding; aggregation; photoisomerization; birefringence; photoinduced molecular reorientation; dipole-dipole interaction;

D O I：

10.1143/JJAP.45.460

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We synthesized novel imidazole-based azo compounds and their optical properties were investigated. In the course of recrystallization, pink-orange and violet products were obtained. The violet one shows poor solubility for most organic solvents except polar aprotic solvents such as dimethylsulfoxide (DMSO) and dimethylfolmamide (DMF). The spectra of NMR in DMSO-d(6) and UV-vis absorption spectra in DMSO for both products were found to be identical. However, there were differences in FT-IR absorption spectra. The violet solid compound exhibited broad bands that could be attributed to N-(HN)-N-... hydrogen bonding. These results show that the violet product consists of an aggregation of molecules formed via intermolecular hydrogen bonding. Additionally, imidazole-based azo copolymers containing liquid crystalline side chain groups were also synthesized. The photoinduced birefringence of these copolymers was observed by irradiation of a linearly polarized 532 mn laser beam as a pumping light. It was confirmed that the material exhibited photoisomerization properties and the observed birefringence was attributed to photoinduced molecular reorientation. Moreover, the dipolar effect in photoinduced birefringence was briefly discussed.

引用

页码：460 / 464

页数：5

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