The crystal structure of metal diethyldithiophosphates. I. Zinc diethyldithiophosphate

The crystal structure of lead diethyldithiophosphate, Pb[S2P(OC2Hs)2]2 has been determined. The final R value was 8-6%. The crystal is triclinic, space group P1, with a=10.102 (2), b= 10-366 (3), c= 9.702 (2)/~, 6~=99.82 (4), r = 109.91 (2), 7=86-17 (3) °, Z=2. The formula units exist as monomers in the crystal. The monomers are packed three-dimensionally with van der Waals contacts. The two diethyldithiophosphate groups are coordinated to the lead atom with the four sulphur ends in a distorted tetragonal pyramidal environment. The Pb-S distances are 2.754, 2.790, 2.990 and 3.022 (0006)/~. The molecule has an approximate twofold symmetry axis passing through the lead atom.