Acta Cryst. (2012). E68, m1546
[ doi:10.1107/S160053681204771X ]

Di-₂-isopropanolato-octamethylbis(-4-methyl-5-sulfanylidene-4,5-dihydro-1H-1,2,4-triazol-1-ido-²N¹:N²)di-₃-oxido-tetratin(IV)

E. Najafi, M. M. Amini and S. W. Ng

Abstract: The tetranuclear title compound, [Sn₄(CH₃)₈(C₃H₇O)₂O₂(C₃H₄N₃S)₂], lies about a center of inversion; the molecule features a three-rung-staircase Sn₄O₄ core in which two Sn^IV atoms are bridged by the 4-methyl-5-sulfanylidene-4,5-dihydro-1H-1,2,4-triazol-1-ide group. The negatively charged N atom of the group binds to the terminal Sn^IV atom at a shorter distance [Sn-N = 2.236 (2) Å] compared with the neutral N atom that binds to the central Sn^IV atom [Sn N = 2.805 (2) Å]. The terminal Sn^IV atom is five-coordinate in a cis-C₂SnNO₂ trigonal-bipyramidal geometry [C-Sn-C = 136.4 (1)°], whereas the central Sn^IV atom is six-coordinate in a C₂SnNO₃ skew-trazepoidal bipyramidal geometry [C-Sn-C = 145.4 (1)°]. The C atoms of the isopropoxy group are disordered over two positions in a 0.591 (7):0.409 (7) ratio.

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