Synthesis of complexes of dimethyltin(IV) with mono- and di-deprotonated pyridoxine (PN) in media with various anions. Crystal structures of [SnMe2(PN-H)]NO3 center dot 2H(2)O, [SnMe2(H2O)(PN-H)]-Cl center dot H2O and [SnMe2(H2O)(PN-2H)]center dot 0.5H(2)O

The reaction of the dimethyltin(IV) cation with pyridoxine [3-hydroxy-4,5-bis(hydroxymethyl)-2-meth PN] has been investigated in ethanol-water (80:20 v/v) containing NO3- and Cl-, NO3- and MeCO2- or Cl- and MeCO2- ions in various mole ratios. The compounds [SnMe2(PN-H)]NO3 . 2H(2)O 1, [SnMe2(H2O)(PN-H)]- H2O 2 and [SnMe2(H2O)(PN-2H)]. 0.5H(2)O 3 were isolated and characterized by-IR, Raman, cross polarization magic angle spinning C-13 NMR and electron impact andFAB mass spectrometry. The structures of the compounds were determined by X-ray diffraction. In I [SnMe2(PN-H)](2)(2+) units in which each moho-deprotonated pyridoxine co-ordinates to one tin atom via the phenolic O and a deprotonated CH2OH group O and to the other via the latter group alone are connected in a polymeric structure via the other CH2OH group of each PN-H. In each dimeric unit the tin atom is co-ordinated to two methyl groups, the phenolic O atom, the O atoms of two deprotonated CH2OH groups, and the O atom of a non-deprotonated CH2OH group. Hydrogen-bonded water and NO3- ions are also present in the crystal lattice. In 2 the lattice contains dimeric [SnMe2(H3O)-(PN -H)](2)(2+) units (in which the tin-pyridoxine co-ordination is the same as:in 1 except that the bonds connecting different units in 1 now bind aqua ligands) and hydrogen-bonded water and chloride ions. In 3 the crystal contains dimeric [SnMe2(H2O)(PN-2H)](2) units (in which the dideprotonated ligand co-ordinates as in 2) and water. The behaviour of these compounds in D2O and (CD3)(2)SO was studied by NMR spectroscopy.