Synthese und Struktur von (MeSe)3Sb / Synthesis and Structure of (MeSe)3Sb

Tris(methylseleno)stibane (1) has been prepared by reaction of Sb with Me2Se2. The crystal structure of 1 consists of (MeSe)3Sb molecules with trigonal pyramidal SbSe3 units (average distances Sb—Se 2.580 Å and Se—C 1.97 A, angles SeSbSe 83-102°). Intermolecular Sb···Se contacts of 3.55-3.66 Å lead to a distorted octahedral coordination at Sb. In the UV-VIS spectrum of the yellow solid of 1 there is a maximum of absorption at 430 nm with a slope to 540 nm. Raman emissions at 204 and 237 cm-1 are related with vs,as SbSe3.