1-Thiazolyl-2-vinylcyclopentene derivatives, 1-(5-methoxy-2-phenyl-4-thiazolyl)-2-(2-methyl-1-phenyl-1-propenyl)perfluorocyclopentene (1a), 1-[5-methoxy-2-(4-methoxyphenyl)-4-thiazolyl]-2-(2-methyl-1-phenyl-1-propenyl)perfluorocyclopentene (2a), and 1-[5-methoxy-2-(4-methoxyphenyl)-4-thiazolyl]-2-[1-(4-methoxyphenyl)-2-methyl-1-propenyl]perfluorocyclopentene (3a) were synthesized in an attempt to obtain yellow photochromic compounds having low photocycloreversion quantum yields and large absorption coefficients of the closed-ring isomers. Their photochromic performance, thermal stability, and fatigue resistance were compared with 1-[5-methoxy-2-(4-methoxyphenyl)-4-thiazolyl]-2-(1,2-dimethyl-1-propenyl)perfluorocyclopentene (4a) having a methyl-substituted olefin. Upon irradiation with 313 nm light, compounds 1a, 2a, and 3a changed from colorless to various shades of yellow in toluene. The conversions from the open-ring (1a, 2a, and 3a) to the closed-ring (1b, 2b, and 3b) isomers in the photostationary state under irradiation with 313 nm light were 93, 95, and 98%, respectively. Among the three derivatives 3b has the largest absorption coefficient (ε = 18900 M−1 cm−1) at 428 nm and the lowest cycloreversion quantum yield of 1.8 × 10−3.
We herein propose a new type of efficient neutral photoacidgenerator. A photoinduced 6π-electrocyclization reaction of photochromic triangle terarylenes triggers subsequent release of a Brønsted acid, which took place from the photocyclized form. A H-atom and its conjugate base were introduced at both sides of a 6π-system to form the self-containedphotoacidgenerator. UV irradiation to the 6π-system
我们在此提出了一种新型高效的中性光酸产生剂。光致变色三角四萘嵌苯的光诱导 6π-电环化反应触发了布朗斯台德酸的后续释放,该反应从光环化形式发生。在 6π 体系的两侧引入 H 原子及其共轭碱以形成自含的光酸产生剂。对 6π 系统的紫外线照射会产生一个带有 H 原子的环己-1,3-二烯部分和分别位于 sp(3) C-原子的 5 位和 6 位的共轭碱,这会自发地释放酸分子定量形成多环芳烃化合物。证明了在环境条件下光酸产生的净量子产率高达 0.52,并证明了环氧单体的光引发阳离子聚合。
Pohtochromic material
申请人:JAPAN SCIENCE AND TECHNOLOGY CORPORATION
公开号:US20040049040A1
公开(公告)日:2004-03-11
A photochromic material having a ring opening quantum yield of 10
−3
or lower which does not fade under ambient light is provided. The material comprises a compound belonging to the diheteroarylethene class. The compound has alkoxy group and aryl group on the heteroaryl group.
A photochromic material having a ring opening quantum yield of 10−3 or lower which does not fade under ambient light is provided. The material comprises a compound belonging to the diheteroarylethene class. The compound has alkoxy group and aryl group on the heteroaryl group.