Syntheses and Crystal Structures of Mono-and Binuclear Copper(Ⅱ) Mixed-ligand Complexes Involving Schiff Base

The mononuclear copper(II) complex [Cu(L)(2-AP)] 1 and binuclear copper(II) complex [Cu(L)(py)]2 2 (L = C10H11O5NS, taurine o-vanillin, py = prydine, 2-AP = 2-aminopyridine) with mixed ligand have been synthesized and characterized by Χ-ray diffraction method. Crystal data for 1: orthorhombic, space group Pbca with a = 11.921(4), b = 15.816(6), c = 17.076(6) ?, V = 3219.7(19) ?3, C15H17CuN3O5S, Z = 8, Mr = 414.92, Dc = 1.712 g/cm3, μ(MoKα) = 1.520 mm–1, F(000) = 1704, the final R = 0.0300 and wR = 0.0705 for 2840 observed reflections with I > 2σ(I); and crystal data for 2: monoclinic, space group P21/c with a = 7.929(3), b = 17.038(5), c = 11.734(4) ?, β = 98.162(6)o, V = 1569.1(9) ?3, C15H16CuN2O5S, Z = 4, Mr = 399.90, Dc = 1.693 g/cm3, F(000) = 820, μ(MoKα) = 1.554 mm–1, the final R = 0.0351 and wR = 0.0848 for 2767 observed reflections (I > 2σ(I)). The molecular structure of complex 1 consists of one tetra-coordinated Cu(II) atom generating a slightly distorted square plane, and a one-dimensional chain structure is formed by intermolecular hydrogen bonds. Complex 2 consists of a diphenolic hydroxyl O-bridged binuclear copper(II) structure. The crystal structures of complexes 1 and 2 reveal that the coordinate copper centers are bound to both nitrogen and oxygen atom donors. The usual N,O-trans arrangement of ligands is observed in both cases.