Coordination polymers based on building blocks of dimethyltin(IV) Chloride iso-thiocyanate and dimethyltin(IV) di-iso-thiocyanate with pyrazine-2-carboxylate and 4, 4′-bipyridine

Abstract

The reaction of 4,4′-bipy with dimethyltin(IV) chloride iso-thiocyanate affords the one-dimensional (1D) coordination polymer, [Me2Sn(NCS)Cl·(4,4′-bipy)]n (1), whereas reaction of dimethyltin(IV) dichloride with sodium pyrazine-2-carboxylate in the presence of potassium iso-thiocyanate affords the two-dimensional (2D) coordination polymer, {[Me2Sn(C4H3N2COO)2]2 [Me2Sn(NCS)2]}n (2). Both coordination polymers were characterized by elemental analysis and infrared spectroscopy in addition to 1H and 13C NMR spectroscopy of the soluble coordination polymer (1). A single-crystal structure determination showed that the asymmetric unit in 1 contains Me2Sn(NCS)Cl and 4,4′-bipy moieties and a 1D infinite rigid chain structure forms through bridging of the 4,4′-bipy ligand between tin atoms and the geometry around the tin atom is a distorted octahedral. Coordination polymer 2 contains two distinct tin atom geometrics in which one tin atom is seven coordinate, and the other is six coordinate. The two tin atom environments are best described as a pentagonal bipyramidal in the former and distorted octahedral in the latter where the carboxylate groups bridge the two tin atoms and construct a 2D-coordination polymer. The 119Sn NMR spectroscopy indicates the octahedral geometry of 1 retains in solution. © 2011 Wiley Periodicals, Inc. Heteroatom Chem 22:699–706, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/.20736