Studies on Analytical Quantum Chemistry(Ⅱ)--The Protonation and Dissociation of a New Chromogcnic Reagent-Chlorophosphonazo-p-Methyl and Their Mechanism

Abstract

Abstract: The protonation and dissociation of chlorophosphonazo-p-methyl(CPApM) in aqueous solution have been studied spectrophotometrically. The protonation constant (lgK_p) was found to be -0. 158±0. 005 and the dissociation constant (pK_a)11. 41 ± 0. 03. The electronic structure of CPApM and microcosmic mechanism of protonation and dissociation of the reagent are interpreted by the calculation with quantum chemistry.

Key words: Spectrophotometric chromogenic reagent, Protonation, Dissociation, HMO method

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Zhou Wei-liang, Du Ying-xiang, Xu Zhong-jun, Pan Jiao-mai . Studies on Analytical Quantum Chemistry(Ⅱ)--The Protonation and Dissociation of a New Chromogcnic Reagent-Chlorophosphonazo-p-Methyl and Their Mechanism[J]. Chem. J. Chinese Universities, 1991, 12(11): 1452.

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Studies on Analytical Quantum Chemistry(Ⅱ)--The Protonation and Dissociation of a New Chromogcnic Reagent-Chlorophosphonazo-p-Methyl and Their Mechanism

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