偶氮苯
光异构化
单层
化学
部分
光化学
自组装单层膜
取代基
偶氮化合物
吸收光谱法
结晶学
高分子化学
异构化
立体化学
分子
有机化学
催化作用
聚合物
光学
生物化学
物理
作者
Haruhisa Akiyama,Kaoru Tamada,Jun’ichi Nagasawa,Koji Abe,Takashi Tamaki
摘要
Asymmetric dialkyl disulfides with a para-substituted azobenzene (i.e., 4-substituted 4‘-(12-(dodecyldithio)dodecyloxy)azobenzenes) produced photoresponsive self-assembled monolayers (SAMs) on gold (111) surfaces. Infrared reflection absorption (IR-RA) spectroscopy and reflection ultraviolet (UV) and visible (vis) light absorption spectroscopy gave information on the molecular orientational order of the adsorbates in the SAMs. The photoreactivity was investigated using dynamic contact-angle measurements with a Wilhelmy-type surface balance. The structure and photoreactivity of the SAMs were dependent on the substituent at the para position of an azobenzene moiety. Relatively ordered structures in the methylene parts and the photoisomerization of azobenzene moieties were observed for the SAMs formed from the hexyl- and the nonsubstituted azobenzene disulfides. However, a less-ordered SAM structure was seen for the cyanoazobenzene disulfide SAM, and the photoresponse is rather unstable.
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