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Detailed spectroscopic, thermodynamic, and kinetic characterization of nickel(II) complexes with 2,2'-bipyridine and 1,10-phenanthroline attained via equilibrium-restricted factor analysis.

Griend DA, Bediako DK, DeVries MJ, DeJong NA, Heeringa LP

Department of Chemistry and Biochemistry, Calvin College, 1726 Knollcrest Circle SE, Grand Rapids, Michigan 49546-4403, USA. dvg@calvin.edu

The molar absorptivity curves of the mono and bis nickel(II) complexes of 2,2'-bipyridine and 1,10-phenanthroline have been deduced from the composite absorbance data of a series of equilibrium solutions in methanol using equilibrium-restricted factor analysis, a technique for extracting spectral and thermodynamic information for component species involved in solution equilibria. The solutions achieve equilibrium slowly (t(1/2) approximately 100 min) as the amounts of the tris and methanolato complexes are initially in excess. The relative formation constants at 293 K have been determined with a high degree of accuracy, especially for the bipyridine complexes: log(K(1)/K(2)) = 0.340(4) and log(K(2)/K(3)) = 1.091(6). Solubility limitations compromised the accuracy of the thermodynamic results for the phenanthroline complexes.

Published 14 January 2008 in Inorg Chem, 47(2): 656-62.
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