Element—Element-Bindungen, III [1]. Intermolekulare Sb···Sb-Wechselwirkungen im kristallinen Tetramethyldistiban1 / Element—Element Bonds, III [1]. Intermolecular Sb···Sb Interactions in Crystalline Tetramethyldistibane

Abstract

Tetramethyldistibane which shows a colour change from deep red to pale yellow upon melting, has been subjected to single-crystal x-ray diffraction analyses at -21° and -139 °C (orthorhombic, Pnma, Z = 4, -139 °C: a = 1150.9(3); b = 1136.8(2) ; c = 651.6(2) pm). The molecules adopt the antiperiplanar conformation with the crystallographically imposed symmetry m (Cs) and are aligned in extended linear antimony chains with short intermolecular contacts (-139 °C: Sb-Sb 283.8(1), Sb···Sb 367.8(1) pm; Sb-Sb---Sb 179.2°). The structure is compared with those of similar compounds.