The title ladder polysilane was synthesized by the cross-coupling of all-trans-[(t-Bu)ClSi]4 and Cl(i-Pr)2SiSi(i-Pr)2Cl with lithium in 40% yield. X-ray crystallographic analysis of the ladder polysilane shows a highly strained silicon skeleton; the Si-Si bond lengths vary from 2.412(3) to 2.481(2) Å and the Si-Si-Si bond angles of the Si4 rings range from 87.9(1) to 90.5(1)°. By comparison of the structure and UV-visible spectra of this compound with those of the perisopropyl analog, we found that the structures and properties of ladder polysilanes are strongly affected by the substituents.
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Kyushin et al. (1994) studied this question.
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