作者:Katsuhira Yoshida、Tetsunao Koujiri、Taeko Horii、Yuji Kubo
DOI:10.1246/bcsj.63.1658
日期:1990.6
investigate the reterdation effects of ortho substituents, the activation parameters were determined; the results suggest that the steric hindrance among the ortho substituents and the two nitrogen lone pairs of the azo group becomes far more severe in an inversional transition-state than in the ground cis-state, which leads to the remarkable slow cis-to-trans isomerization. On the basis of the kinetic data
为了在功能分子设计中利用苯基偶氮萘的可逆光致变色体系,研究了各种取代苯基偶氮萘的光致变色行为。在偶氮基的邻位上引入取代基延缓了热顺式到反式异构化的速率。延迟效应很大程度上取决于邻位取代基的数量和位置。为了研究邻位取代基的阻滞效应,确定了活化参数;结果表明,在倒转过渡态中,邻位取代基和偶氮基团的两个氮孤对之间的空间位阻比在基顺态中严重得多,这导致显着缓慢的顺式到反式异构化。