The crystal structure of bismuth diethyldithiophosphinate–benzene (1/1), Bi(S2PEt2)3·C6H6

Abstract

Crystals of Bi(S₂PEt₂)₃·C₆H₆ are trigonal with a= 12.342(5) and c= 17.412(7)Å, space group R3. The structure has been solved by Patterson and Fourier methods for 906 independent reflections and refined by least squares to R 0.042. The bismuth atom, which lies on a three-fold axis, is surrounded by six sulphur atoms from three symmetrically chelating ligands, mean Bi–S 2.79 Å. The twist angle relating to the two sets of independent sulphur atoms is 34.7°, describing a co-ordination polyhedron lying almost midway between the octahedral and trigonal prismatic extremes. The bismuth lone pair of electrons is considered to be sterically inactive.