title: Copper(II) complexes derived from di-2-pyridyl ketone-N(4)-phenyl-3-semicarbazone: Synthesis and spectral studies.
abstract: Five copper(II) complexes [CuLCl](2).CuCl(2).4H(2)O (1), [CuLOAc] (2), [CuLNO(3)](2) (3), [CuLN(3)] (4) and [CuLNCS].3/2H(2)O (5) of di-2-pyridyl ketone-N(4)-phenyl-3-semicarbazone (HL) were synthesized and characterized by elemental analyses and electronic, infrared and EPR spectral techniques. In all these complexes the semicarbazone undergoes deprotonation and coordinates through enolate oxygen, azomethine and pyridyl nitrogen atoms. All the complexes are EPR active due to the presence of an unpaired electron. EPR spectra of all the complexes in DMF at 77K suggest axial symmetry and the presence of half field signals for the complexes 1 and 3 indicates dimeric structures.
authors.affiliation: Department of Applied Chemistry, Cochin University of Science and Technology, Kochi 682 022, Kerala, India.
authors.forename: T A
authors.initials: TA
authors.lastname: Reena
authors.forename: M R Prathapachandra
authors.initials: MR
authors.lastname: Kurup
mesh_terms: D015082:2,2'-Dipyridyl / Q000737:chemistry*; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D004578:Electron Spin Resonance Spectroscopy; D007659:Ketones / Q000737:chemistry; D012664:Semicarbazones / Q000737:chemistry*; D013055:Spectrophotometry, Infrared
chemical_list: D056831:Coordination Complexes; D007659:Ketones; D012664:Semicarbazones; D015082:2,2'-Dipyridyl; D003300:Copper