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KMID : 1059519890330060607
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Journal of the Korean Chemical Society
1989 Volume.33 No. 6 p.607 ~ p.613
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Equilibria between Low-spin State (D4h) and High-spin State (Oh) of the Ni (Ⅱ)-N4 Complex Ion (N4 : 2,12-dimethyl-3,7,11,17-tetraazabicyclo-11,3,1-heptadeca-1(17),2,11,13,15-pentaene)
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Park Yu-Chul
Byun Jong-Chul
Yu Mahn-Su
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Abstract
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The chemical equilibria of Ni(Ⅱ)-tetraamine (tetraamine = 2,12-dimethyl-3,7,11,17-tetraazabicyclo-11,3,1-heptadeca-1(17),2,11,13,15-pentaene) complex ion in water, acetonitrile, acetone and nitromethane were investigated using spectrophotometric method, respectively. The equilibria between low-spin (D4h) and high-spin (Oh) structures of Ni-tetraamine complex ion were presented in water, acetonitrile and acetone, but not in nitromethane. The eqilibrium constants, the reaction enthalpies and the reaction entropies were determined from analysis of the temperature dependence of the electronic spectra. The formation of the triplet species (Oh) was found to be exothermic. The solvent and electrolyte effects on the equilibrium constants could be explained by the dielectric constants of solvents and the reaction entropies.
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