Syntheses and characterization of diorganotin derivatives of 2-mercapto-5-methyl-1,3,4-thiadiazole:: X-ray crystal structure of polymeric (C3H3S2N2) [(n-C4H9)6Sn3O(OH)2](C3H3S2N2)

Diorganotin derivatives of 2-mercapto-5-methyl-1,3,4 -thiadiazole, (C3H3S2N2)[(R)(6)Sn3O(OH)(2)](C3H3S2N2) (R = Me 1, n-Bu 2, Ph 3, PhCH2 4), have been synthesized and characterized by IR, H-1, C-13 and Sn-119 NMR spectroscopy. Among them, polymer 2 was also characterized by X-ray crystallography diffraction analysis. This revealed that 2 showed a unique tricyclic structure consisting of a fused five-membered Sn2ON2 ring and a four-membered Sn2O2 ring. These formed a planar N2Sn3O2 skeleton, with distorted trigonal bipyramidal coordination at the two tin centers and a distorted octahedral coordination at the other tin center. The supramolecular structure of polymer 2 was a 1D zig-zag polymeric chain stabilized by intermolecular O-H center dot center dot center dot S hydrogen bonds.