title: EPR, IR and electronic spectral studies on Mn(II), Co(II), Ni(II) and Cu(II) complexes with a new 22-membered azamacrocyclic [N4] ligand.
abstract: The complexes of transition metal ions with an azamacrocyclic tetradentate nitrogen donor [N4] ligand viz. 2,6,12,16,21,22-hexaaza;3,5,13,15-tetramethyltricyclo[15.3.1.1(7-11)] docosa;1(21),2,5,7,9,11(22),12,15,17,19-decaene (L) have been synthesized. All the complexes were found to have general composition M(L)X2 [where M = manganese(II), cobalt(II), nickel(II) and copper(II) and X = Cl- & NO3-]. All the complexes are characterized by the elemental analysis, molar conductance measurements, magnetic susceptibility measurements, mass, 1H NMR, IR, electronic, EPR spectral and cyclic voltammetric studies. An octahedral geometry was assigned for Mn(II), Co(II) and Ni(II) complexes and tetragonal for Cu(II) complexes. The biological actions of the ligand and complexes have been screened in vitro against many bacteria and pathogenic fungi to study their comparative capacity to inhibit the growth.
authors.affiliation: Department of Chemistry, Zakir Husain College, University of Delhi, J.L. Nehru Marg, New Delhi 110 002, 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: D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000494:pharmacology; D000935:Antifungal Agents / Q000737:chemistry / Q000494:pharmacology; D003035:Cobalt / Q000737:chemistry; D003300:Copper / Q000737:chemistry; D004563:Electrochemistry; D004578:Electron Spin Resonance Spectroscopy; D008024:Ligands; D047028:Macrocyclic Compounds / Q000737:chemistry* / Q000494:pharmacology; D008345:Manganese / Q000737:chemistry; D013058:Mass Spectrometry; D008826:Microbial Sensitivity Tests; D009532:Nickel / Q000737:chemistry; D009942:Organometallic Compounds / Q000737:chemistry* / Q000494:pharmacology; D013055:Spectrophotometry, Infrared
chemical_list: D000900:Anti-Bacterial Agents; D000935:Antifungal Agents; D008024:Ligands; D047028:Macrocyclic Compounds; D009942:Organometallic Compounds; D003035:Cobalt; D008345:Manganese; D003300:Copper; D009532:Nickel