title: Elaborated 1H NMR study for the ligitional behavior of two thiosemicarbazide derivatives towards some heavy metals (Sn(II), Sb(III), Pb(II) and Bi(III)), thermal, antibacterial and antifungal studies.
abstract: A new series of heavy metal complexes are prepared. Sn(II), Sb(III), Pb(II) and Bi(III) are the metal ions used in complexation with two thiosemicarbazide ligands. The IR and (1)H NMR spectra of the free ligands display their presence in thiole-thione forms coincide with each other. The IR spectra of the complexes support the presence of 2:2 molar ratio (M:HL) with HL(1) ligand and 1:1 beside 1:2 with HL(2). The ligand coordinates as bi molecules in some complexes and displays two tautomer forms at the same complex molecule (1)H NMR spectra of Sn(II) and Sb(III) complexes were done and comes coincide with IR data. The electronic spectral analysis displays a lower shift appearance in n→π* charge transfer band in most isolated complexes. As well as, a new band is shinned in visible region with Sb(III), Bi(III) complexes and Sn(II)-HL(2). This band is pointed to its use in spectrophotometric analysis for these metal ions. The TG analysis for all isolated compounds was briefly discussed. The molecular modeling parameters support the stability of thiole form of the free ligands in comparing with their thiones by a small difference. The antibacterial and antifungal activities were studied against some organisms and reveal the priority of most investigated complexes.
authors.affiliation: Department of Chemistry, Faculty of Science, Mansoura University, Egypt.
authors.forename: Nashwa M
authors.initials: NM
authors.lastname: el-Metwaly
authors.forename: Moamen S
authors.initials: MS
authors.lastname: Refat
mesh_terms: D000900:Anti-Bacterial Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D000935:Antifungal Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D000965:Antimony / Q000737:chemistry; D001729:Bismuth / Q000737:chemistry; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D004347:Drug Interactions; D006859:Hydrogen / Q000737:chemistry; D007477:Ions / Q000737:chemistry; D007854:Lead / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D019216:Metals, Heavy / Q000737:chemistry*; D008826:Microbial Sensitivity Tests; D008954:Models, Biological; D008958:Models, Molecular; D015394:Molecular Structure; D009947:Organotin Compounds / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D012663:Semicarbazides / Q000737:chemistry*; D013816:Thermodynamics; D014001:Tin / Q000737:chemistry
chemical_list: D000900:Anti-Bacterial Agents; D000935:Antifungal Agents; D056831:Coordination Complexes; D007477:Ions; D019216:Metals, Heavy; D009947:Organotin Compounds; D012663:Semicarbazides; D007854:Lead; C005151:thiosemicarbazide; D014001:Tin; D006859:Hydrogen; D000965:Antimony; D001729:Bismuth