Copper(II) Complexes of Hydrazone Derivatives

Abstract

Three benzil based, macrocyclic oxygen-, nitrogen-, and sulfur-containing ligands, (3,4,10,11 -tetraphenyl-1,2,5,6,8,9,12,13-octaazacyclotetradeca-7,14-dithione-2,4,9,11 -tetraene) ethanol (L1), 10,1 l-diethoxy-3,4,10,11-tetraphenyl-1,2,5,6,8,9,12,13-octaazacyclotetradeca- 7.14-dithione-2,4-diene (L2), (3,4,10,11 -tetraphenyl-1,2,5,6,8,9,12,13-octaazacyclotetradeca- 7.14-dione-2,4,9,l 1-tetraene) ethanol (L3); a cyclic ligand, 6-ethoxy-l,6-diphenyl-4-oxo- 3,4,5,6-tetrahydro-2,3,5-triazine (L5) and two open chain ligands, benzilsemicarbazone (L6) and benzilbisthiosemicarbazone (L4) are reported. These ligands react with copper(II) chloride, nitrate and acetate. The complexes obtained have been characterized on the basis of NMR , IR, electronic and mass spectral studies, conductance and analytical data. The stoichiometry and the spectroscopic data o f the complexes indicate that the copper ions are coordinated by neutral ligands or by ligand anions formed by loss o f protons from the ligand. The molecular and crystal structure of 6-ethoxy-l,6-diphenyl-4-oxo-3,4,5,6-tetrahydro- 2,3,5-triazine (L 5) was determined by X-ray diffraction; the space group is triclinic, P1̄ with a = 7.865(1), b = 14.101(6), c = 15.733(9) Å, α = 69.10(3)°, β = 75.62(2)°, γ = 86.69(2)°, V = 1578(1) Å3, Z = 4.