title: Spectral studies of cobalt(II) complexes of 12-membered macrocyclic ligands having thiosemicarbazone moieties.
abstract: Cobalt(II) complexes of general composition [Co(L)X(2)] and [Co(L(1))X(2)] where (X=NO(3)(-), CH(3)COO(-), Cl(-), Br(-), NCS(-), (1/2)SO(4)(-2)); L=5,11-diethyl-6,12-dimethyl-3,8-dithione-1,2,4,7,9,10-hexaaza cyclododeca-1,4,6,10-tetraene and L(1)=5,11-diethyl-6,12-dimethyl-3,8-dione-1,2,4,7,9,10-hexaaza cyclododeca-1,4,6,10-tetraene with tetradentate 12-membered macrocyclic ligands have been synthesized and characterized by elemental analysis, magnetic susceptibility, IR, electronic and electon spin resonance spectral studies. The various physico-chemical techniques suggest a coordination number six (octahedral geometry) for chloro, nitrato, bromo and thiocyanato complexes, and five-coordinated trigonal bipyramidal geometry for sulphato complexes. All the complexes are of high spin type showing magnetic moment corresponding to three unpaired electrons. All the complexes were also screened against bacteria and pathogenic fungi in vitro.
authors.affiliation: Department of Chemistry, Zakir Husain College, University of Delhi, JL Nehru Marg, New Delhi, India. schandra_00@yahoo.com
authors.forename: Sulekh
authors.initials: S
authors.lastname: Chandra
authors.forename: Meenakshi
authors.initials: M
authors.lastname: Pundir
mesh_terms: D001419:Bacteria / Q000187:drug effects; D003035:Cobalt / Q000737:chemistry*; D004553:Electric Conductivity; D004578:Electron Spin Resonance Spectroscopy; D004583:Electrons; D005658:Fungi / Q000187:drug effects; D008024:Ligands; D047028:Macrocyclic Compounds / Q000737:chemistry* / Q000494:pharmacology; D008280:Magnetics; D013058:Mass Spectrometry; D008826:Microbial Sensitivity Tests; D013055:Spectrophotometry, Infrared; D013882:Thiosemicarbazones / Q000737:chemistry* / Q000494:pharmacology
chemical_list: D008024:Ligands; D047028:Macrocyclic Compounds; D013882:Thiosemicarbazones; D003035:Cobalt