Poly[(octamethyltetrasilylene)methylene] was prepared by the Wurtz reaction of bis(chlorotetramethyldisilanyl)methane. The periodic structure with Si 4 C-type sequences was characterized by 1 H-, 13 C-, and 29 Si-NMR. An investigation of the UV absorption and photoluminescence properties of this polymer in solid-state film revealed the unique character of Si 4 C-type periodic polycarbosilane. The σ−σ* transition energy varied from 5.2 to 4.5 eV due to conformation. The strong Stokes shift (1.2 eV) indicated that the emission is due to a “self-trapped” exciton state, in which excitation is weakly delocalized in a skeleton with a nonvertical geometry.
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Hiroaki Isaka (1997) studied this question.
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