http://nopr.niscpr.res.in/handle/123456789/39845 Fri, 09 Oct 2026 10:23:10 GMT 2026-10-09T10:23:10Z http://nopr.niscpr.res.in/handle/123456789/40171 Title: Synthesis and characterization of dioxouranium(VI), oxovanadium(lV), thorium(lV), zinc(II), cadmium(II), mercury(II) and lead(II) complexes with propylenediamine-bis(isatin) schiff base Authors: Khalifa, Mohamed A; Hassaan, Aly M Abstract: Some metal complexes of propylenediamine-bis(isatin) schiff base ligand with dioxouranium(VI), oxovanadium(lV), Th(lV), Zn(II), Cd(II), Hg(lI) and Pb(lI) have been prepared and characterized by elemental analysis. IR, UV-visible, NMR spectra as well as molar conductivity and magnetic measurements. The data suggest a 1:1 (metal: ligand) stoichiometry for all the isolated complexes. The ligand behaves as neutral ONNO quadridentate for all chelates except for those prepared from the direct reaction of the free ligand with dioxouranium(VI), Zn(II) and Pb(Il) where the ligand acts as.dibasic quadridentate. Page(s): 580-583 Sat, 01 Jul 1995 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/40171 1995-07-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/40169 Title: Effect of nickel(II) ternary complex formation on the coordination behaviour of glycylglycine in aqueous solution Authors: Nair, M Sivasankaran; Neelakantan, M A; Gnanaselvi, B V Persis; Shenbagavalli, P Abstract: The stability constants of parent complexes of the ligands glycylglycine and glycinamide(A) with Ni(Il). and of the ternary complexes formed with Iigands imidazole, histamine and L-histidine(B) have been determined by the <i>p</i>H-metric measurements at 37°C and <i>l </i>= 0.15 mol dm^{- 3} (NaCIO₄). It has been found that the ligands A form NiABH, NiAB, and NiAH_-1 B mixed ligand complexes with histamine and <img src='http://www.niscair.res.in/jinfo/small.gif' border=0>-histidine(B) Iigands. while with imidazole(B) ligand the saturated NiA B₂ and unsaturated NiAB species have been found to be present. The mode of coordination of ligands A and B in the NiABH and NiAB/NiAB₂ ternary species is similar to their binding in their respective binary species. Though amide deprotonated glycylglycine is tridentate in its NiAH_-1 species, in the NiAH _-1B ternary species in the Ni(II)-glycylglycine(A)-histamine/<img src='http://www.niscair.res.in/jinfo/small.gif' border=0>-histidine(B) systems. it binds the metal in a bidentate manner. Page(s): 576-579 Sat, 01 Jul 1995 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/40169 1995-07-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/40168 Title: Synthesis and characterization of platinum(II) and palladium(II) complexes of methionine and nucleosides Authors: Khan, Badar Taqui; Mohan, K Murali; Khan, S Rounaq Ali; Goud, G Narsa Abstract: A few binary complexes like <i>cis</i>-dichloromethionineplatinum( II), [Pt(MetH)Cl₂] and cis-dichloromethioninepalladium( II), [Pd(MetH)CI₂] react with the nucleosides, viz. adenosine, guanosine, inosine, and cytidine in a 1:1 molar ratio to form mixed ligand complexes. The complexes have been characterized on the basis of analytical, conductivity, infrared, electronic and ¹HNMR spectral data. In these complexes the metal ion is coordinated to methionine through amino nitrogen and sulphur atoms. The purine nucleosides are bound to the metal ion through the ring nitrogen (N₇) and the pyrimidine nucleoside through the ring nitrogen (N₃), in a configuration <i>trans </i> to methionine sulphur. The higher <i>trans </i> directing ability of sulphur as compared to that of amino nitrogen of methionine is responsible for this configuration. Page(s): 573-575 Sat, 01 Jul 1995 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/40168 1995-07-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/40166 Title: Effect of denaturants on the speciation of amino acid complexes-Computer augmented modelling studies - IV: Cobalt(II), copper(II) and zinc(II) complexes of L-glutamic acid in water-N,N' -dimethylformamide mixtures^† Authors: Babu, M Saratchandra; Sukumar, J Stanley; Rao, G Nageswara; Ramana, Karri V; Rao, M S Prasada Abstract: A computer assisted investigation has been made on the nature of complexes of cobalt(Il), copper(II) and zinc(II) with L-glutamic acid. The distribution of these metal ions amongst the complexes formed with the above amino acid has been computed. The formation constants required for this calculation have been determined experimentally by monitoring H⁺ concentration. The formation constants have been refined with the computer program, MINIQUAD 75ᵒ using the primary alkalimetric data. The predominant complexes formed are CoL, CoL<img src='http://www.niscair.res.in/jinfo/twobytwo.gif' border=0>. CuL<img src='http://www.niscair.res.in/jinfo/doubletwo.gif' border=0>, CuL,CuLH⁺.CuL²H^-.ZnL,ZnL<img src='http://www.niscair.res.in/jinfo/doubletwo.gif' border=0>.and ZnLH⁺. The distribution patterns of different species varies with the relative concentrations of the metal ion and the ligand. Page(s): 567-572 Sat, 01 Jul 1995 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/40166 1995-07-01T00:00:00Z