Abstract
The reaction between Bil3, [PPh4] and an excess of PMe2Ph afforded the ionic compound [PPh4][Bil4(PMe2Ph)2] the structure of which has been determined by X-ray crystallography. The anion [Bil4(PMe2Ph)2]– comprises an octahedral bismuth centre bonded to four iodines and two cis phosphine ligands, although there are some significant distortions from idealised octahedral co-ordination, the origins of which are discussed. From the reaction between SbBr3 and PEt3, the ionic complex [PEt3H][Sb2Br7(PEt3)2] was isolated, probably as a result of adventitious hydrolysis, and also characterised by X-ray crystallography. A discrete dinuclear anion [Sb2Br7(PEt3)2]– is present in this complex with a geometry best described as between face-shared bioctahedral and two square-based pyramids sharing a vertex.
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