Singlet Fission and Excimer Formation in Disordered Solids of Alkyl-Substituted 1,3-Diphenylisobenzofurans
作者:Paul I. Dron、Josef Michl、Justin C. Johnson
DOI:10.1021/acs.jpca.7b07362
日期:2017.11.16
diffraction peaks. The films of 1 carrying a methyl in the para position of one phenyl ring undergo SF relatively efficiently (≥75% triplet yield, ΦT) but more slowly than thin films of 1. When the methyl is replaced with a t-butyl, kinetic competition in the excited state favors excimer formation rather than SF (ΦT = 55%). When t-Bu groups are placed in both meta positions of the phenyl substituent, SF is slowed
我们描述了溶液和薄膜中1,3-二苯基异苯并呋喃(1)的三种烷基衍生物的制备和激发态动力学。取代旨在破坏在1的晶体中观察到的粉滑堆积堆积,同时保持单线态裂变(SF)的单线态和三线态的有利能量。通过不存在强的X射线衍射峰可以判断,所有取代均会导致薄膜大部分为非晶态。的膜1在一个苯基环的对位上带有甲基经受SF相对有效(≥75%三重收率,Φ Ť),但比更慢的薄膜1。当甲基被t取代时丁基,处于兴奋状态动力学竞争有利于形成受激准分子,而不是SF(Φ Ť = 55%)。当吨-Bu组被放置在苯基取代基的两个间位,SF被减慢进一步和Φ Ť = 35%。