title: Versatile binding properties of a di-2-pyridyl ketone nicotinoylhydrazone ligand: crystal structure of a Cu(II) complex.
abstract: Six new copper complexes of di-2-pyridyl ketone nicotinoylhydrazone (HDKN) have been synthesized. The complexes have been characterized by a variety of spectroscopic techniques and the structure of [Cu(DKN)(2)]·H(2)O has been determined by single crystal X-ray diffraction. The compound [Cu(DKN)(2)]·H(2)O crystallized in the monoclinic space group P2(1) and has a distorted octahedral geometry. The IR spectra revealed the presence of variable modes of chelation for the investigated ligand. The EPR spectra of compounds [Cu(2)(DKN)(2)(μ-N(3))(2)] and [Cu(2)(DKN)(2)(μ-NCS)(2)] in polycrystalline state suggest a dimeric structure as they exhibited a half field signal, which indicate the presence of a weak interaction between two Cu(II) ions in these complexes.
authors.affiliation: Department of Applied Chemistry, Cochin University of Science and Technology, Kochi, Kerala, India.
authors.forename: Neema Ani
authors.initials: NA
authors.lastname: Mangalam
authors.forename: M R Prathapachandra
authors.initials: MR
authors.lastname: Kurup
mesh_terms: D002614:Chelating Agents / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004578:Electron Spin Resonance Spectroscopy; D006835:Hydrazones / Q000737:chemistry*; D008024:Ligands; D008969:Molecular Sequence Data; D015394:Molecular Structure; D011725:Pyridines / Q000737:chemistry*
chemical_list: D002614:Chelating Agents; D006835:Hydrazones; D008024:Ligands; D011725:Pyridines; C511462:di-2-pyridyl ketone isonicotinoyl hydrazone; D003300:Copper