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, PhCH22, n-Bu 3), R2SnClmLn (m = 1, n = 1, R = CH34, Ph 5, n-Bu 6, PhCH27; m = 0, n = 2, R = CH38, n-Bu 9, Ph 10, PhCH211) 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, 1H, 13C and temperature-dependent 119Sn 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.