Electron and Energy of Silylene-Spaced Aryl Copolymers
Date Issued
2006
Date
2006
Author(s)
Wang, Hsian-Wen
DOI
zh-TW
Abstract
A series of regioregular silylene-spaced alternating donor-acceptor arene copolymers [(donor)-SiMe2-(acceptor)-SiMe2-]n were synthesized by rhodium catalyzed hydrosilylation of bis-alkynes with bis-silylhydride or by palladium catalyzed Heck reaction of di-bromoarene with bis-vinylsilane. Vinylsilylhydrides were prepared by nickel-catalyzed olefination of the corresponding aryl dithioacetals with Grignard reagent followed by LAH reduction. Unlike most copolymers, our strategy has furnished a powerful arsenal for the construction of copolymers with precise regiochemistry and repetitive units. The silylene group serves as an insulating building block between chromophores.
In the aniline and anthracene copolymer, efficient intrachain electron transfer between donor-acceptor chromophores is observed. On the other hand, in the biphenyl and anthracene copolymer, very weak intensity emission coming from donor is observed in fluorescence spectra, illustrating that energy transfer is highly efficient between the donor and the acceptor along the copolymer chain.
In addition, the polymer composed of three different chromophores is synthesized, the sequential energy and electron transfer along the polymeric chain is also observed. In this three chromophores silyene-spaced copolymer system, we can successfully mimic the photosynthesis process in the green plants.
Subjects
矽烷基
電子轉移
能量轉移
silylene
electron transfer
energy transfer
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-95-R93223039-1.pdf
Size
23.31 KB
Format
Adobe PDF
Checksum
(MD5):562905adc942fa3edad2c256a0cf52ab