Thermally Irreversible Photochromic Systems. Reversible Photocyclization of Non-Symmetric Diarylethene Derivatives
作者:Yasuhide Nakayama、Koichiro Hayashi、Masahiro Irie
DOI:10.1246/bcsj.64.789
日期:1991.3
ring on the other end of the double bond were synthesized in an attempt to get thermally irreversible photochromic compounds having absorption bands at longer wavelengths. 2-(1,2-Dimethyl-3-indolyl)-3-(2,4,5-trimethyl-3-thienyl)maleic anhydride(8a) underwent photoinduced cyclization/ring-opening reactions with relatively high quantum yields (cyclization quantum yield: 0.15; ring-opening quantum yield:
合成了一端为吲哚环、双键另一端为噻吩、苯并[b]噻吩或吡咯环的非对称二芳基乙烯,试图获得具有更长吸收带的热不可逆光致变色化合物波长。2-(1,2-Dimethyl-3-indoyl)-3-(2,4,5-trimethyl-3-thienyl)maleic anhydride(8a) 经历了光致环化/开环反应,量子产率相对较高(环化量子产率:0.15;开环量子产率:0.40),两种异构体都是热稳定的。闭环形式在 595 nm 处具有最大吸收,边缘延伸至 760 nm。8a 和 2-(1,2-二甲基-3-吲哚基)-3-(2-甲基-3-苯并[b]噻吩基)马来酸酐 (9a) 的环化/开环反应是由 Ar 离子诱导的 (488 nm) 和 He-Ne (633 nm) 激光器。