The synthesis and characterisation of Sn(IV) complexes of 2,6-pyridine dicarboxylate — the molecular structure of divinyltin(IV) derivative

A series of organotin(IV) derivatives were obtained employing 2,6-pyridinedicarboxylate as ligand: [{SnBu 3(OOC) 2C 5H 3N} n ] ( 1), [SnBuCl(OOC) 2C 5H 3N] ( 2) and [Sn(CHCH 2) 2(OOC) 2C 5H 3N] ( 3). They were fully characterised by multinuclear NMR [ 1H, 13C{ 1H}, and 119Sn{ 1H}], IR spectroscopies and elemental analysis. In addition suitable crystals of ( 3) have shown a dimmeric arrangement by X-ray crystallographic studies, held together by Sn–O intermolecular interactions which persists in solution. The crystal packing shows hydrogen bonds joining the dimmers, forming two infinite one-dimensional chain. Each monomer comprises a Sn(IV) centre bonded to a pyridinecarboxylate-containing ring, through both nitrogen and oxygen donor atoms. It is also co-ordinated by a water molecule and two vinyl groups.