NOPR Collection:

Adsorption of oxine and its derivatives on granular activated carbon

Sun, 01 Dec 2002 00:00:00 GMT

Title: Adsorption of oxine and its derivatives on granular activated carbon Authors: Mustoor, Ms Veena; Natarajan, G S Abstract: The adsorption of 8-hydroxyquinoline and some of its derivatives on granular activated carbon. F-400 sample, has been studied. The adsorption isotherms have been determined and tested for adherance to Freundlich and Langmuir theories. The surface area calculated on the basis of monolayer formation of these adsorbates has been correlated with structure of the oxines. Page(s): 2551-2554

Trace level determination of bromide in presence of large concentration of chloride by differential pulse polarography

Sun, 01 Dec 2002 00:00:00 GMT

Title: Trace level determination of bromide in presence of large concentration of chloride by differential pulse polarography Authors: Sharma, P; Sharma, Rakesh Abstract: The optimum conditions for the determination of bromide at low concentrations has been developed employing differential pulse polarography. A detection limit of 0.3 μg/ml has been achieved. The method has been successfully applied for the analysis of bromide content in underground waters and food products. Page(s): 2548-2550

Synthesis and characterization of lanthanide complexes of 1-phenyl-3-methyl-5- hydroxy-4-pyrazolyl-phenyl ketone-2ʹ-picolinoyl hydrazone

Sun, 01 Dec 2002 00:00:00 GMT

Title: Synthesis and characterization of lanthanide complexes of 1-phenyl-3-methyl-5- hydroxy-4-pyrazolyl-phenyl ketone-2ʹ-picolinoyl hydrazone Authors: Thaker, B T; Modi, Chetan K Abstract: The ligand, 1-phenyl-3-methyl-5-hydroxy-4-pyrazolyl-phenyl ketone-2ʹ-picolinoyl hydrazone (HL) is prepared by condensation of 1-phenyl-3-methyl -4-ben zoyl-5-pyrazolone with 2-picolinic acid hydrazide. Seven complexes of lanthanides with HL of the type [Ln (HL)₃].2 H₂O (where Ln=trivalent lanthanides such as La, Ce, Nd, Sm, Gd, Dy and Er) have been synthesized and characterized by complexometric titration of lanthanoid ions,elemental analysis, molar condudance, IR, ¹H NMR, electronic spectral studies, and TGA analysis, IR spectra and thermogram shows the presence of two water moieties outside the coordination sphere and are non-electrolytic in nature. The complexes appear to be nine -coordinated and ligand act as a tridentate ligand. Page(s): 2544-2547

Synthesis and spectroscopic characterization of molybdenum(0) and molybdenum(II) carbonyl benzophenoneazine complexes

Sun, 01 Dec 2002 00:00:00 GMT

Title: Synthesis and spectroscopic characterization of molybdenum(0) and molybdenum(II) carbonyl benzophenoneazine complexes Authors: Affan, M A; Hitam, Ramli bin; Shamsuddin, Mustaffa bin Abstract: A chelating 2-methylpyridylbenzophenoneazinc ligand has been prepared by the condensation of 2-acetylpyridine with benzophenone hydrazone. Reaction of the ligand with Mo(CO)₆ gives 12-methylpyridylbenzophenoneazine) tetracarbonylmolybdenum(0) complex where the ligand is bidentate N, N. Oxidative-addition of the tetracarbonyl complex with 1 mol equivalent of bromine, yields the neutral seven-coordinated dibromotricarbonylmolybdenum( II) azine complex. Treatment of the tetracarbonyl complex with 1 mol equivalent of PPh₃ gives the expected tri -carbnonylmolybdenum(0)-azine tri phenylphosphine substituted complex. Page(s): 2540-2543