Synthesis and Structure of the Clusters [Hg2(μ—SePh)2(SePh)2(PPh3)2] and [Hg3Br3(μ—SePh)3] · 2 DMSO

Abstract

AbstractThe compounds [Hg2(μ—SePh)2(SePh)2(PPh3)2] (I) and [Hg3Br3(μ—SePh)3] · 2 DMSO (II) are formed by reactions of [Hg(SePh)2] with PPh3 in THF(I) or with HgBr2 in DMSO (II) at room temperature. X—ray crystallography reveals that the cluster I consists of a distorted square built by each two Hg and Se atoms. The Hg atoms have almost tetrahedral co‐ordination environments formed by selenium atoms of two (μ‐—SePh) ligands and Se and P atoms of terminal —SePh and PPh3 ligands. The compound II is a six‐membered ring with alternating Hg and Se atoms in the chair conformation. Two DMSO molecules occupy positions below and above the [Hg3Se3] ring with the oxygen atoms directed to the centre of the ring.