,Spectrophotometric determination of the formation constants of Calcium(Ⅱ)complexes with 1,2-ethylen

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In this work, with the purpose to explore the coordination chemistry of calcium complexes which could work as a partial model of man-ganese-calcium cluster, a spectrophotometric study to evaluate the stability of the complexes: Calcium(Ⅱ)-1,2-ethylendiamine, Calcium(Ⅱ)-1,3-propanediamine and Calcium(Ⅱ)-1,4-butanediamine in acetonitrile, were carried on. By processing the spectrophotometric data with the HypSpec program allows the determination of the formation constants. The logarithmic values of the formation constants obtained for Cal-cium(Ⅱ)-1,2-ethylendiamine, Calcium(Ⅱ)-1,3-propanediamine and Calcium(Ⅱ)-1,4-butanediamine were log β110 = 4.69, log β110 = 5.25 and logβ110 = 4.072, respectively.
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