Synthesis, spectroscopic study and crystal structure of bis (4,6-dimethyl-2-thiopyrimidinium) tetrachlorozincatum(II) monohydrate and its solid state transformations
作者:M.L. Godino-Salido、R. López-Garzón、M.D. Gutierrez-Valero、J.M. Moreno
DOI:10.1016/0020-1693(95)04634-l
日期:1995.8
The solid complex [H(2)L],[ZnCl4]. H2O (HL=4,6-dimethyl-2-thiopyrimidine) has been obtained and characterized by IR, H-1 and C-13 NMR spectroscopies and thermal techniques. The molecular structure of this complex has been established by single crystal X-ray diffraction. Crystals of the compound are orthorhombic, of space group P2(1)2(1)2(1) with cell constants a = 7.153(2), b = 14.624(3), c = 20.499(4) Angstrom, Z = 6 and D-c = 1.572 g cm(-3). The structure was solved and refined to R = 0.049 (R(w) = 0.029). The asymmetric complex unit consists of two 4,6-dimethyl-2-thiopyrimidinium cations, a [ZnCl4](2-) anion and a water molecule. The Zn(II) centres are tetracoordinated by chloride ions giving a tetrahedral arrangement. This asymmetric unit is stacked along the b axis giving rise to a packing of pyrimidine rings and [ZnCl4](2-) anions which are linked by hydrogen bonds involving chlorine atoms, NH groups and water molecules. The thermal treatment of [H(2)L](2)[ZnCl4]. H2O leads to two different solid complexes [Zn(HL)(2)Cl-2] and [ZnL(2)] which have been previously obtained and characterized by us.