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Year: 2009  |  Volume: 28  |  Issue: 3  |  Page No.: 548 - 552

Structural studies on Ph3MSMPh3 (M = Sn, Pb): Quest for a metal–metal bond

Neetu Singh, Rajendra Prasad and Subrato Bhattacharya    

Abstract: The title compounds Ph3PbSPbPh3 (1) and Ph3SnSSnPh3 (2) were prepared in high yields by a reaction of Na2S, respectively, with Ph3Pb(SOCMe) and Ph3Sn(SOCMe). X-ray crystallographic and density functional studies were made to understand the structure and bonding in these molecules. Though the Pb–Pb distance in 1 is only marginally shorter than the sum of the corresponding van der Waals’ radii, a smaller Pb–S–Pb angle suggests for a Pb···Pb interaction. DFT calculations were performed to analyse the nature of M···M interaction in 1 and 2. Strong intramolecular π–π interactions subsist between the different phenyl rings of the molecules.

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