Thorpe-Ingold Effect on Photoinduced Electron Transfer of Dialkylsilylene-Spaced Divinylarene Copolymers Having Alternating Donor and Acceptor Chromophores
Resource
Macromolecules 40 (26): 9238-9243
Journal
Macromolecules
Journal Volume
40
Journal Issue
26
Pages
9238-9243
Date Issued
2007
Date
2007
Author(s)
Yeh, Mei-Yu
Lin, Hsin-Chieh
Lee, Shern-Long
Lim, Tsong-Shin
Fann, Wunshain
Abstract
Dialkylsilylene-spaced divinylarene copolymers having alternating donor and acceptor chromophores are designed and synthesized. The rates of photoinduced electron transfer (PET) depend on the nature of the substituent on silicon. A replacement of the methyl substituent by the bulky isopropyl group has been shown to enhance the rate of PET. The results are rationalized in terms of the Thorpe−Ingold effect, which would bring the neighboring donor and acceptor chromophores in closer proximity. The STM images of the isopropyl-substituted copolymers are more folded than those of the methyl-substituted analogues, and these results are consistent with the outcome of photophysical studies of these copolymers.
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Type
journal article
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