title: Spectroscopic studies of transition metal complexes with a N-donor tetradentate(N4) 12-membered macrocylic ligand.
abstract: Chromium(III), manganese(II), iron(III), cobalt(II), nickel(II), copper(II), ruthenium(III), iridium(III), palladium(II) and platinum(II) complexes were synthesized with a 12-membered 1,4,7,10-tetraazadodeca-5,6,11,12-tetraene macrocylic ligand (L) and characterized by elemental analysis, molar conductance, magnetic susceptibility, IR, electronic, EPR and Mössbauer [Fe(III)] spectral studies. The molar conductance measurements of all the complexes in DMF solution correspond to non-electrolytic nature for M(L)Cl2 complexes [where M=Mn(II), Co(II), Ni(II), Cu(II)], 1:1 electrolytes for M'(L)Cl3 complexes [where M'=Cr(III), Fe(III), Ru(III) and Ir(III)] and 1:2 electrolytes for M''(L)Cl2 complexes [where M''=Pd(II) and Pt(II)]. Thus, the complexes may be formulated as [M(L)C1(2)], [M'(L)C1(2)]C1 and [M''(L)]C1(2), respectively [where L=ligand]. All complexes were of the high-spin type and found to have six-coordinate octahedral geometry except the Pd(II) and Pt(II) complexes which were four coordinate, square planar and diamagnetic.
authors.affiliation: Department of Chemistry, Zakir Husain College, University of Delhi, J.L.N. Marg, New Delhi 110002, India. schandra_00@yahoo.com
authors.forename: Sulekh
authors.initials: S
authors.lastname: Chandra
authors.forename: Shweta
authors.initials: S
authors.lastname: Verma
mesh_terms: D008024:Ligands; D047028:Macrocyclic Compounds / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D019216:Metals, Heavy / Q000737:chemistry; D015394:Molecular Structure; D009570:Nitriles / Q000737:chemistry; D009584:Nitrogen / Q000737:chemistry*; D012492:Salts / Q000737:chemistry; D028561:Transition Elements / Q000737:chemistry*; D014732:Vibration
chemical_list: D008024:Ligands; D047028:Macrocyclic Compounds; D019216:Metals, Heavy; D009570:Nitriles; D012492:Salts; D028561:Transition Elements; C011206:cyanogen; D009584:Nitrogen