Syntheses, Optical Properties, and Theoretical Investigation of Silafluorenes and Spirobisilafluorenes Bearing Electron-Donating Aminostyryl Arms around a Silafluorene Core
作者:Tomohiro Agouâ、Md.â
Delwar Hossainâ、Takayuki Kawashima
DOI:10.1002/chem.200901481
日期:2010.1.4
π‐Extended silafluorenes and spirobisilafluorenes bearing electron‐donating aminostyryl substituents at the 2,7‐ or 3,6‐positions were synthesized by a Horner–Wadsworth–Emmons reaction. The electronic influence of spirocyclic structure and substitution mode of the aminostyryl substituents was investigated by UV/Vis spectroscopy, which indicated the existence of a spiroconjugation effect in the 3,6‐substituted
通过Horner-Wadsworth-Emmons反应合成了在2,7或3,6-位带有给电子氨基苯乙烯基取代基的π-扩展的硅芴和螺二硅芴。通过UV / Vis光谱研究了氨基苯乙烯基取代基的螺环结构和取代模式的电子影响,这表明在3,6-取代的螺双二硅芴中存在螺共轭效应。它们显示出中等至强的荧光发射,并且荧光特性与3,6-取代的螺双二硅芴芴相兼容,后者显示出相对较大的荧光量子产率和Stokes位移增强。