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Abstract
The new bicyclic lead(II) phosphinate [(t-Bu)2PO2]2Pb (1) was synthesized by the reaction of p-tolyllead triacetate with di-t-butylphosphinic acid and water. An X-ray study showed that it had a pseudo-trigonal bipyramidal geometry (p-TBP) with a stereochemically active lone pair of electrons occupying an equatorial site. Infrared data ruled out the possible presence of a Pb[sbnd]H bond. A series of new monocyclic Pb(IV) compounds, [Et4N][(MeC6H3S2)PbPh2X] where X = Br (2), CI (3), and F (4), was synthesized from the addition reaction of tetraethylammonium halide to 2,2-diphenyl-1,3,2-toluene dithiolato plumbole(IV), (MeC6H3S2)PbPh2 (5). An X-ray study of 3 revealed a monocyclic anionic TBP geometry which was compared with related dithiolato cyclic structures formed earlier by lighter elements of Group IVA. The lead(II) compound 1 crystallizes in the monoclinic space group C2/c with a = 15.594(4) Å, b = 16.889(3) Å, c = 12.642(2) Å, β = 136.85(1)°, and Z = 4. The lead(IV) compound 3 crystallizes in the monoclinic space group P21/c with a = 12.245(5) Å, b = 12.049(3) Å, c = 19.048(4) Å, β = 96.22(2)°, and Z = 4. The conventional unweighted residuals are 0.023(1) and 0.0387 (3).