Metal complexes derived from hydrazoneoxime ligands VI. Synthesis, characterization and structures of zinc(II) complexes derived from aroylhydrazoneoximes

Abstract

The reaction of Zn(OAc)2.2H2O with substituted diacetylmonoxime aroylhydrazones H2L-R, R = H, p-CH3, p–OCH3, p-Cland p-NO2, using 1: 1 molar ratio, in acidified ethanol as a solvent afforded [{Zn(HL-H)(OAc)}2].H2O 1, [{Zn(HL-CH3)(OAc)}2].H2O 2, [{Zn(HL–OCH3)(OAc)}2].H2O 3, [Zn(HL-Cl)(OAc)(H2O)].H2O 4, [{Zn(HL-NO2)(OAc)}3]n5 respectively. The isolated complexes were characterized by elemental analysis, IR spectra, solution electronic absorption spectra, solution 1H NMR and 13C NMR spectra, and electrospray ionization mass spectra ESI- MS. The crystal and molecular structures of 1, 2, 4 and 5 have been determined by single crystal x-ray diffraction. Self assembly and supramolecular architectures of these complexes have been discussed. The substituent effects of the aroylhydrazone residue on the binding modes of acetate anion as well as the nuclearity and dimensionality of the formed complexes have been also discussed.