Structural correlations in nickel(II)-thiodiacetato complexes:molecular and crystal structures and properties of[Ni(tda)(H_2O)_3]

摘要

Triaqua(thiodiacetato)nickel(II)has been synthesized and studied by X-ray crystallography,thermal,spectral and magnetic methods.The compound crystallizes in the triclinic system,space group PI,in contrast to the related compound[Ni(tda)(H_2O)j]o H_2O(orthorhombic)reported long time ago.As in other four Ni-tda derivatives,the metal atom exhibits an octahedral coordination and tda ligand adopts a fac-tridentate chelating role.The studied compound is closely related to[Zn(tda)(H_2O)_3].In addition,a structural comparison of the binary and ternary Ni-tda derivatives reveals that auxiliary N-donor ligands bind the metal atom using the trans-positions towards the Ni-O(carboxylato)bonds,but not in trans to the Ni-S(thioether)bond.