Syntheses, crystal structures and coordination modes of tri- and di-organotin derivatives with 2-mercapto-4-methylpyrimidine

The organotin (IV) derivatives of 2-mercapto-4-methylpyrimidine (Hmpymt) R3SnL (R = Ph 1, PhCH2 2, n-Bu 3), R2SnClmLn (m = 1, n = 1, R = CH3 4, Ph 5, n-Bu 6, PhCH2 7; m = 0, n = 2, R = CH3 8, n-Bu 9, Ph 10, PhCH2 11) were obtained by the reaction of the organotin(IV) chlorides R3SnCl or R2SnCl2 with 2-mercapto-4-methylpyrimidine hydrochloride (HCl - Hmpymt) in 1: 1 or 1:2 molar ratio. All complexes 1-11 were characterized by elemental analyses, IR, H-1, C-13 and temperature-dependent Sn-119 NMR spectra. Except for complexes 3 and 6, the structures of complexes 1, 2, 4, 5, 7, 8-11 were confirmed by X-ray crystallography. Including tin-nitrogen intramolecular interaction, the tin atoms of complexes 1-7 are all five-coordinated and their geometries are distorted trigonal bipyramidal. While the tin atoms of complexes 8-11 are six-coordinated and their geometries are distorted octahedral. Besides, the ligand adopts the different coordination modes to bond to tin atom between the complexes 1, 6, 7 and 2, 3, 4, 5, 8-11. Furthermore, intermolecular Sn...N or Sn...S interactions were recognized in crystal structures of complexes 4, 7 and 11, respectively. (C) 2004 Elsevier B.V. All rights reserved.