Abstract
Crystals of [C6H5P]4S are orthorhombic, a= 24·700(6), b= 13·508(3), c= 13·410(2)Å, Z= 8, space group Pbca. The structure was solved from diffractometer data by direct methods, and refined by full-matrix least-squares methods to R 0·083 for 1475 observed reflexions. The phosphorus and sulphur atoms form a five-membered ring which has a puckered conformation, with the sulphur atom nearly in the mean plane through the ring atoms and the phosphorus atoms alternately above and below it. Mean bond lengths are: P–P 2·190(5), P–S 2·116(5), P–C 1·831 (22), and C–C 1·382(16)Å. The angle at sulphur is 110·4(2)° and the endocyclic angles at phosphorus range from 104·2(2)–105·9(2)°, mean 105·2°. The phenyl rings are nearly perpendicular to the mean plane through the five-membered P4S ring. Pairs of phenyl rings on the same side of the P4S ring are close to being parallel to each other and perpendicular to the pair on the other side.
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