title: Design and characterization of Cu(II) complexes from 2-benzoylpyridine benzhydrazone: crystallographic evidence for coordination versatility.
abstract: The syntheses and characterization of six copper(II) complexes of 2-benzoylpyridine benzhydrazone in the form of [Cu(BPB)(2)], [Cu(BPB)Cl].H(2)O, [Cu(BPB)Br], [Cu(2)(BPB)(2)](ClO(4))(2).4H(2)O, [Cu(BPB)N(3)].H(2)O, and [Cu(BPB)NCS].H(2)O.CH(3)OH are reported. The analytical methods used for the characterization of complexes include partial elemental analyses, IR, electronic and EPR spectra, conductivity measurements, magnetic susceptibility measurements and single crystal X-ray diffraction. From the crystal structure, it is clear that the hydrazone adopts the E conformation about the azo bond to attach to the metal through the N(py)-N(azo)-O chelating system. In the EPR spectra of complexes in DMF at 77K four hyperfine quartets in the parallel region could be resolved and a half field signal is observed at 1500 G for complex [Cu(2)(BPB)(2)](ClO(4))(2).4H(2)O in polycrystalline state at 298 K which gives evidence for its binuclear nature indicating a weak interaction between the two Cu(II) ions.
authors.affiliation: Department of Applied Chemistry, Cochin University of Science and Technology, Kochi, Kerala 682 022, India.
authors.forename: Neema Ani
authors.initials: NA
authors.lastname: Mangalam
authors.forename: Sarika
authors.initials: S
authors.lastname: Sivakumar
authors.forename: M R Prathapachandra
authors.initials: MR
authors.lastname: Kurup
authors.forename: Eringathodi
authors.initials: E
authors.lastname: Suresh
mesh_terms: D056831:Coordination Complexes; D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D015195:Drug Design; D004578:Electron Spin Resonance Spectroscopy; D006835:Hydrazones / Q000737:chemistry*; D008956:Models, Chemical; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D013055:Spectrophotometry, Infrared
chemical_list: D056831:Coordination Complexes; D006835:Hydrazones; D009942:Organometallic Compounds; C027566:benzhydrazone; D003300:Copper