Synthesis and spectral characterization of some mixed ligand complexes of CuII containing NNS and NN/NO/OO chelating ligands

Inorganic Chemistry Section, Department of Chemistry, Jadavpur University, Kolkata-700 032, India E-mail : c_r_sinha@yahoo.com Fax : 91-033-24137121 Present address : Institute of Chemistry, Academia Sinica, Nankang, Taipei-115, Taiwan Manuscript received 09 August 2016, revised 19 September 2016, accepted 20 September 2016 Cu(NN´S)Cl2 (NN´S : 1-alkyl-2-{(o-thioalkyl)phenylazo}imidazole) reacts with some bidentate chelating ligands like, N,N (2,2´-bipyridine, 1,10-phenanthroline), N,O (oxine, picolinic acid) and O,O (salicylic acid, oxalic acid) to prepare mixed ligand complexes, [Cu(NN´S)(N,N)](ClO4)2, [Cu(NN´S)(N,O)](ClO4) and [Cu(NN´S)(O,O)]. The complexes are characterized by the elemental analysis, Mass, molar conductance measurements, magnetic moment data. Penta-coordinated distorted square pyramidal structure is supported by spectral studies (FT-IR, UV-Vis). The cyclic voltammetric measurements and EPR spectral studies assign CuII redox state. DFT and TD-DFT computation have been carried out of representative complex to explain spectral and redox properties