Effects of boryl, phosphino, and phosphonio substituents on optical, electrochemical, and photophysical properties of 2,5-dithienylphospholes and 2-phenyl-5-thienylphospholes
Group 14 Metalloles with Thienyl Groups on 2,5-Positions: Effects of Group 14 Elements on Their π-Electronic Structures
作者:Shigehiro Yamaguchi、Yujiro Itami、Kohei Tamao
DOI:10.1021/om980393z
日期:1998.10.1
from silole to stannole have essentially the same electronic structures and, thereby, comparable photophysical properties to each other, while significant differences exist between the cyclopentadiene and silole derivatives. The central group 14 elements, silicon, germanium, and tin, of the metalloles affect the LUMO energy levels of the π-electronic systems to almost the same extent through σ*−π*
Cyclopentane- and cyclohexane-fused arsoles were also synthesized. While the former was stable, the latter gradually decomposed to the corresponding diketone under ambient conditions owing to its frustrated structure. The frustration of the fused cyclohexane also caused large structural relaxation, resulting in a relatively large Stokes shift.