Synthesis and characterization of tetranuclear alkyltin)IV) compounds with Schiff base ligand pyruvic acid isonicotinyl hydrazone and crystal structure of {[nBu2Sn(C9H8N3O3)O]SnBun3}2

The tetranuclear alkyltin(IV) compounds {[R2Sn(C9H8N3O3)O]SnR3}(2) [R=n-Bu (1), 4-CNC6H4CH2 (2), C6H5CH2 (3), 4-ClC6H4CH2 (4)] were prepared by the reaction of Schiff base ligand pyruvic acid isonicotinyl hydrazone with (R3Sn)(2)O in the corresponding molar ratio of 1:1. All compounds have been characterized by elemental analysis, IR and H-1 NMR spectra. The crystal structure of compound 1 was determined by X-ray single crystal diffractional analysis. This compound exhibits a dimeric structure containing distannoxane units with two types of the tin atoms. For the first tin atom, it appears to be seven-coordinated with a distorted pentagonal bipyramid geometry, and the other is five-coordinated with a distorted trigonal bipyramidal geometry. The molecules are packed in the unit cell in two-dimensional network structure through an interaction between the N atoms of the pyridine and the tin atoms of an adjacent molecule.