Thin film of linear oligosilane, Me(SiMe2)12Me, was prepared by a vacuum-deposition method. In the film, the Si-backbones adopted all-trans conformation and highly oriented perpendicular to the substrate. The oligosilane film showed a sharp UV absorption at 285 nm attributed to the planar-zigzag form.
Condensations of R(Ph)GeCl2 (R = t-Bu and R = CEt2Me) with Mg/MgBr2 in THF produced cyclotetragermanes [R(Ph)Ge]4, which were converted to [R(Cl)Ge]4 by treatment with HCl/AlCl3 or with CF3SO3H followed by CH3COCl. The crystal structure of [t-Bu(Cl)Ge]4 was established by X-ray diffraction. Unusual configurational behavior of cyclotetragermanes is also described.
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