title: Spectral and structural studies of copper(II) complexes of thiosemicarbazones derived from salicylaldehyde and containing ring incorporated at N(4)-position.
abstract: Mononuclear and binuclear copper(II) complexes (1-8) with two ONS donor thiosemicarbazone ligands {salicylaldehyde 3-hexamethyleneiminyl thiosemicarbazone [H2L1] and salicylaldehyde 3-tetramethyleneiminyl thiosemicarbazone [H2L2]} have been prepared and physico-chemically characterized. IR, electronic and EPR spectra of the complexes have been obtained. The thiosemicarbazones bind to metal as dianionic ONS donor ligands in all the complexes except in [Cu(HL1)2] (2) and [Cu(HL2)2] (6). In compounds 2 and 6 the ligands are coordinated as monoanionic HL- ones. The magnetic susceptibility measurements indicate that all the complexes are paramagnetic. In complex [(CuL1)2] (1), the magnetic moment value is lower than the expected spin only value. In all the complexes g(||)>g( perpendicular)>2.0023 and G values within the range 2.5-3.5 are consistent with dx2-y2 ground state. The complexes were given the formula as [(CuL1)2] (1); [Cu(HL1)2] (2); [CuL1bpy] (3); [CuL1phen] (4); [CuL1gamma-pic].2H2O (5); [Cu(HL2)2] (6); [CuL2py].3H2O (7); [CuL2bipy] (8). The structure of the compound 8 have been solved by single crystal X-ray crystallography and was found to be distorted square pyramid around copper(II) ion.
authors.affiliation: Department of Applied Chemistry, Cochin University of Science and Technology, Kochi 682022, Kerala, India.
authors.forename: Leji
authors.initials: L
authors.lastname: Latheef
authors.forename: Maliyeckal R Prathapachandra
authors.initials: MR
authors.lastname: Kurup
mesh_terms: D000447:Aldehydes / Q000737:chemistry*; D003300:Copper / Q000032:analysis* / Q000737:chemistry; D018360:Crystallography, X-Ray; D004578:Electron Spin Resonance Spectroscopy / Q000379:methods*; D008024:Ligands; D008280:Magnetics; D015394:Molecular Structure; D013055:Spectrophotometry, Infrared / Q000379:methods*; D013882:Thiosemicarbazones / Q000032:analysis* / Q000737:chemistry
chemical_list: D000447:Aldehydes; D008024:Ligands; D013882:Thiosemicarbazones; C013243:salicylaldehyde; D003300:Copper