2,2,4,6-Tetraaryl-2H-benzo[h]chromenes: The influence of electronic communication between aryl substituents on their photochromism
作者:Stuart Aiken、Georgina K. Armitage、Orlando D.C.C. de Azevedo、Daniel L. Crossley、Rhianne Dobson、Christopher D. Gabbutt、B. Mark Heron、Denis Jacquemin、Craig R. Rice、Nicola Soltowska
DOI:10.1016/j.dyepig.2021.110036
日期:2022.3
have been efficiently synthesised by two complementary strategies employing the condensation of 1,1,3-triarylprop-2-yn-1-ols with 4-substituted 1-naphthols and Suzuki cross-coupling chemistry. The novel 1,1,3-triarylpropynols were readily obtained either by the addition of an arylacetylide to the requisite benzophenones or by a Sonogashira coupling of a halobenzene with a preformed 1,1-diarylprop-2-yn-1-ol
一系列光致变色的2,2,4,6-tetraaryl-2 H -benzo [ h]色烯已通过两种互补策略有效合成,即采用 1,1,3-triarylprop-2-yn-1-ols 与 4-取代 1-萘酚的缩合和 Suzuki 交叉偶联化学。新的 1,1,3-三芳基丙炔醇很容易通过将芳基乙炔添加到必需的二苯甲酮中或通过卤代苯与预先形成的 1,1-二芳基丙-2-yn-1-醇的 Sonogashira 偶联来获得。在 C-4 处具有强吸电子芳基部分的四芳基苯并色烯表现出良好的室温光致变色。C-6 处的强给电子芳基与 C-4 处的强吸电子芳基的组合导致产生光部花青,其在电磁光谱的可见光区表现出两个吸收带,而不是当 C-6 芳基仅弱给电子时的一个宽带。显着地反转 C-4 和 C-6 芳基的电子性质导致光致变色的抑制,而是导致荧光。TD-DFT 计算用于合理化从光致变色到荧光的转变。