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KMID : 1059519860300050475
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Journal of the Korean Chemical Society
1986 Volume.30 No. 5 p.475 ~ p.482
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Kinetic and Equilibrium Studies on Complex Formation Between Ni(II) and D-Penicillamine in Aqueous Media
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Kim Yong-Kyun
Choi Sung-Nak
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Abstract
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Rates and equilibriurn of complex formation between Ni2+ and D-penicillamine have been investigated in aqueous solutions. Kinetic study on the complex formation were performed in the pH range of 8∼9 by the use of pressure-jump technique. D-Penicillamine coordinates to the nickel(Ⅱ) ion utilizing sulfur and nitrogen as donor atoms in the high pH condition (pH 9.2). However, in the pH range of 8.25∼9.07, the stepwise stability constant becomes drastically reduced and the undissociated mercapto group does not participate in bonding. The rate-determining step of the complexation reaction is found to be the release of a water molecule from the inner-coordination sphere of Ni2+ ion.
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