Synthesis and crystal structure of diorganotin(IV) complexes with pyruvic acid benzoylhydrazone and pyruvic acid salicylhydrazone

摘要

Six diorganotin esters of Schiff-base ligands formulated as [R_2SnLY]_2, where L_1 is C_6H_5CON_2C(CH_3)CO_2 with Y = CH_3CH_2OH, R = mClC_6H_4CH_2 (1), oFC_6H_4CH_2 (2), pFC_6H_4CH_2 (3) and L, is 2-HOC6H_4CON_2C(CH_3)CO_2 with Y = CH_3OH, R = oFC_6H_4CH_2 (4), pFC_6H_4CH_2 (5), mClC_6H_4CH_2 (6) have been prepared and characterized by elemental analysis, IR, ~1H and ~(119)Sn NMR spectra. The crystal structures of complexes 1 and 4 have been determined by X-ray single crystal diffraction. The structure analyses reveal that the Sn atom in both 1 and 4 is seven-coordinate in distorted pentagonal bipyramid geometries with a planar SnO_4N unit and two apical aryl carbon atoms, thus forming a dimeric molecule, which sits on a crystallographic center of symmetry. Intramolecular or intradimeric hydrogen bonds contribute to the stability and compactness of the crystal structures.