title: Modern spectroscopic techniques in the characterization of Schiff base macrocyclic ligand and its complexes with transition metals.
abstract: Mn(II), Co(II), Ni(II), and Cu(II) complexes with a new azamacrocyclic tetradentate [N(4)] ligand i.e. 2,3,9,10-tetraphenyl;l,4,8,11-tetraazacyclotetradeca;1,3,8,10-tetraene (L) have been synthesized and characterized by elemental analysis, molar conductance measurements, magnetic susceptibility measurements, mass, (1)HNMR, IR, electronic and EPR spectral studies. On the basis of their non-electrolytic nature, the probable formula of the complexes is proposed to be [M(L)X(2)], where M=Mn(II), Co(II), Ni(II), and Cu(II), X=Cl(-) and NO(3)(-), in dimethylformamide (DMF). All the complexes are of high-spin type and found to have six coordinated, octahedral geometry for Mn(II), Co(II), and Ni(II) complexes, and tetragonal for Cu(II) complexes. Macrocyclic ligand and its complexes have also been screened against pathogenic bacteria and fungi in vitro as growth inhibiting agent.
authors.affiliation: Department of Chemistry, Zakir Husain College, University of Delhi, JLN Marg, New Delhi 110002, India. schandra_00@yahoo.com
authors.forename: Sulekh
authors.initials: S
authors.lastname: Chandra
authors.forename: Lokesh Kumar
authors.initials: LK
authors.lastname: Gupta
mesh_terms: D003035:Cobalt; D004578:Electron Spin Resonance Spectroscopy; D000431:Ethanol; D008024:Ligands; D009682:Magnetic Resonance Spectroscopy; D008345:Manganese; D008958:Models, Molecular; D011083:Polycyclic Compounds / Q000737:chemistry*; D012545:Schiff Bases / Q000737:chemistry*; D012996:Solutions; D013055:Spectrophotometry, Infrared; D028561:Transition Elements / Q000737:chemistry*
chemical_list: D008024:Ligands; D011083:Polycyclic Compounds; D012545:Schiff Bases; D012996:Solutions; D028561:Transition Elements; D003035:Cobalt; D000431:Ethanol; D008345:Manganese