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Kinetics of the complexation of nickel(II) with 1,10-phenanthroline and its derivatives in acetonitrile–water mixed solvents by Masaaki Tabata; Toshihiro Murase; Kousuke Kurisaki; Ying Guang Wu is a Chemistry article available to read on EtoBox.

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The kinetics of the complexation of Ni(II) with 1,10-phenanthroline(phen), 4,7-dimethyl-1,10-phenanthroline(dmphen), and 5nitro-1,10-phenanthroline(NO 2 phen) in acetonitrile-water mixed solvents of acetonitrile mole fraction x AN = 0, 0.05, 0.1, 0.2 and 0.3 at 288, 293, 298 and 303 K have been studied by stopped-flow method at ionic strength of 1.0 (NaClO 4 ) and pH 7.4. The corresponding activation enthalpy, entropy, and free energy were determined from the observed rate constants. The complexation of Ni(II) with the three ligands has comparable observed rate constants; in pure water the observed rate constants are (•10 3 dm 3 mol À1 s À1 ) 2.31, 2.57, and 1.38 for phen, dmphen and NO 2 phen, respectively. The corresponding activation parameters for the three ligands are, however, considerably different; in pure water the DH à /DS à (kJ mol À1 /J K À1 mol À1 ) are 44.7/À30.2, 19.5/ À114.1, and 32.2/À76.9 for phen, dmphen, and NO 2 phen, respectively. The effects of solvent composition on the kinetics are also markedly different for the three ligands. The DH à and DS à showed a minimum at x AN = 0.1 for phen; for dmphen and NO 2 phen, however, maxima at x AN = 0.2 were observed. N

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Author

Masaaki Tabata; Toshihiro Murase; Kousuke Kurisaki; Ying Guang Wu

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0020-1693)

Published

2005

Language

EN

Field

Chemistry (Physical Sciences)