title: Synthesis, spectroscopic, thermal and antimicrobial studies of neodymium(III) and samarium(III) complexes derived from tetradentate ligands containing N and S donor atoms.
abstract: Trivalent lanthanide complexes of the type [Ln(L)Cl(H2O)2] (where Ln=Nd(III) or Sm(III) and LH2=Schiff bases derived by the condensation of 3-(phenyl/substitutedphenyl)-4-amino-5-mercapto-1,2,4-triazole with diacetyl/benzil) have been synthesized by the reactions of anhydrous lanthanide(III) chloride with Schiff bases in methanol. The structures of the complexes have been proposed on the basis of elemental analysis, electrical conductance, magnetic moment, spectroscopic measurements (IR, 1H, 13C NMR and UV-vis spectra) and X-ray diffraction studies. The spectral data reveal that the Schiff base ligands behave as dibasic tetradentate chelating agents having coordination sites at two thiol sulfur atoms and two azomethine nitrogen atoms. The presence of coordinated water in metal complexes was confirmed by thermal and IR data of the complexes. All the Schiff bases and their metal complexes have also been screened for their antibacterial activity against Bacillus subtilis, Staphylococcus aureus and antifungal activities against Aspergillus niger, Curvularia pallescens and Colletotrichum capsici.
authors.affiliation: Chemistry Department, D.D.U. Gorakhpur University, Gorakhpur 273009, India.
authors.forename: Qurratul
authors.initials: Q
authors.lastname: Ain
authors.affiliation: Chemistry Department, D.D.U. Gorakhpur University, Gorakhpur 273009, India.
authors.forename: S K
authors.initials: SK
authors.lastname: Pandey
authors.affiliation: Chemistry Department, D.D.U. Gorakhpur University, Gorakhpur 273009, India.
authors.forename: O P
authors.initials: OP
authors.lastname: Pandey
authors.affiliation: Chemistry Department, D.D.U. Gorakhpur University, Gorakhpur 273009, India. Electronic address: sengupta@hotmail.co.uk.
authors.forename: S K
authors.initials: SK
authors.lastname: Sengupta
mesh_terms: D000900:Anti-Bacterial Agents / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D000935:Antifungal Agents / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D001419:Bacteria / Q000187:drug effects; D001424:Bacterial Infections / Q000188:drug therapy; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D005658:Fungi / Q000187:drug effects; D006801:Humans; D008024:Ligands; D008826:Microbial Sensitivity Tests; D009181:Mycoses / Q000188:drug therapy; D009354:Neodymium / Q000737:chemistry* / Q000494:pharmacology; D012493:Samarium / Q000737:chemistry* / Q000494:pharmacology; D012545:Schiff Bases / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D013057:Spectrum Analysis; D013696:Temperature; D014230:Triazoles / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology
chemical_list: D000900:Anti-Bacterial Agents; D000935:Antifungal Agents; D056831:Coordination Complexes; D008024:Ligands; D012545:Schiff Bases; D014230:Triazoles; C045575:1,2,4-triazole; D009354:Neodymium; D012493:Samarium
keywords: 1,2,4-Triazoles; Antimicrobial; Lanthanide complexes; Spectroscopic properties; Thermal analysis