title: Spectroscopic studies and antibacterial activities of some new 16-membered octaazamacrocyclic complexes derived from thiocarbohydrazide and pentane-2,4-dione.
abstract: A series of macrocyclic complexes of the type [M(C12H20N8S2)X2]; where M=Co(II), Ni(II), Cu(II), Zn(II); X=Cl-, NO3-, CH3COO- has been synthesized by template condensation of thiocarbohydrazide and pentane-2,4-dione in the presence of divalent metal salts in methanolic medium. The complexes have been characterized with the help of elemental analyses, conductance measurements, magnetic measurements, electronic, NMR, IR, EPR and MS spectral studies. The low value of molar conductance indicates them to be non-electrolytes. On the basis of various studies a distorted octahedral geometry may be proposed for all of these complexes. These metal complexes were also tested for their in vitro antibacterial activities against some Gram-positive bacterial strains, i.e., Bacillus subtilis, Bacillus stearothermophilus and two Gram-negative bacterial strains, i.e., Escherichia coli, Pseudomonas putida. The results obtained were compared with standard antibiotics, Chloramphenicol and Streptomycin and found that some of the synthesized complexes show good antibacterial activities as compared to the standard antibiotics.
authors.affiliation: Department of Chemistry, National Institute of Technology, Kurukshetra 136 119, India. dpsinghchem@yahoo.co.in
authors.forename: D P
authors.initials: DP
authors.lastname: Singh
authors.forename: Krishan
authors.initials: K
authors.lastname: Kumar
authors.forename: Rimpi
authors.initials: R
authors.lastname: Mehani ne'e Chopra
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001372:Aza Compounds / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects; D003035:Cobalt / Q000737:chemistry; D003300:Copper / Q000737:chemistry; D004578:Electron Spin Resonance Spectroscopy; D004583:Electrons; D006834:Hydrazines / Q000737:chemistry*; D047028:Macrocyclic Compounds / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D009682:Magnetic Resonance Spectroscopy; D008280:Magnetics; D013058:Mass Spectrometry; D008826:Microbial Sensitivity Tests; D009532:Nickel / Q000737:chemistry; D010422:Pentanones / Q000737:chemistry*; D013055:Spectrophotometry, Infrared
chemical_list: D000900:Anti-Bacterial Agents; D001372:Aza Compounds; D006834:Hydrazines; D047028:Macrocyclic Compounds; D010422:Pentanones; C011368:thiocarbohydrazide; D003035:Cobalt; C008790:acetylacetone; D003300:Copper; D009532:Nickel