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The ab initio molecular orbital approach suggested that polysilane oligomer has a tendency to prefer a trans zigzag-type structure rather than a random structure when the molecule is charged. Such unique behavior in the rotational barrier of charged polysilane has the potential for a description of solvatochromic transition in conformation of the Si main chain in poly[bis(4-propoxybutyl)silylene] when acids are added.
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Orimoto et al. (2002) studied this question.
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