title: Synthesis, spectroscopic, thermal and DFT calculations of 2-(3-amino-2-hydrazono-4-oxothiazolidin-5-yl) acetic acid binuclear metal complexes.
abstract: The binuclear complexes of 2-(3-amino-2-hydrazono-4-oxothiazolidin-5-yl) acetic acid ligand (HL) with Fe(III), Co(II), Ni(II), Cu(II) and Zn(II) ions were prepared and their stoichiometry was determined by elemental analysis. The stereochemistry of the studied series of metal complexes was established by analyzing their infrared, (1)H NMR spectra and the magnetic moment measurements. According to the elemental analysis data, the complexes were found to have the formulae [Fe2L(H2O)8]Cl5 and [M2L(H2O)8]Cl3 (M=Co(II), Ni(II), Cu(II) and Zn(II)). The present analyses demonstrate that all metal ions coordinated to the ligand via O(9), O(11), N(16) and N(18) atoms. Thermal decomposition studies of the ligand-metal complexes have been performed to verify the status of water molecules present in these metal complexes and their general decomposition pattern. Density Functional Theory (DFT) calculations at the B3LYP/6-31G(*) level of theory have been carried out to investigate the equilibrium geometry of the ligand and complexes. Moreover, charge density distribution, extent of distortion from regular geometry, dipole moment and orientation have been performed and discussed.
authors.affiliation: Chemistry Department, Faculty of Science, Cairo University, 12613 Giza, Egypt.
authors.forename: Walid M I
authors.initials: WM
authors.lastname: Hassan
authors.forename: M A
authors.initials: MA
authors.lastname: Badawy
authors.forename: Gehad G
authors.initials: GG
authors.lastname: Mohamed
authors.forename: H
authors.initials: H
authors.lastname: Moustafa
authors.forename: Salwa
authors.initials: S
authors.lastname: Elramly
mesh_terms: D019342:Acetic Acid / Q000138:chemical synthesis* / Q000737:chemistry*; D056831:Coordination Complexes / Q000138:chemical synthesis* / Q000737:chemistry*; D004055:Differential Thermal Analysis; D004553:Electric Conductivity; D004583:Electrons; D004602:Elements; D006835:Hydrazones / Q000138:chemical synthesis* / Q000737:chemistry*; D008024:Ligands; D060328:Magnetic Phenomena; D009682:Magnetic Resonance Spectroscopy; D008956:Models, Chemical; D008968:Molecular Conformation; D011789:Quantum Theory; D013055:Spectrophotometry, Infrared; D013696:Temperature; D013816:Thermodynamics; D013818:Thermogravimetry; D053778:Thiazolidines / Q000138:chemical synthesis* / Q000737:chemistry*
chemical_list: D056831:Coordination Complexes; D004602:Elements; D006835:Hydrazones; D008024:Ligands; D053778:Thiazolidines; D019342:Acetic Acid