Studies On the Stability of Group Ⅱ B Metal Ion-α-amino Acids-diketooxime Ternary Systems

Abstract

Abstract: The protonation constants of 3,3,9,9-tetramethyl-4,8-diazaundecane-2,10-dioxime(PnAO) and six α-amino acids, the stability constants of Zn(Ⅱ), Cd(Ⅱ), Hg(Ⅱ) PnAO, Zn(Ⅱ), Cd(Ⅱ), Hg(Ⅱ)-α-amino acids binary complexes and Zn(Ⅱ), Cd(Ⅱ), Hg(Ⅱ)-PnAO-α-amino acids ternary complexes have been determined by pHtitration method at (35±0.1) ℃, I =0.1 mol/L KNO₃. The results show that the Linear Free Energy Relationship(LFER) has been found to exist between the protonation constants of α-amino acids and the corresponding stability constants of Zn(Ⅱ), Cd(Ⅱ), Hg(Ⅱ) PnAO-α-amino acids ternary system. The cause of existence of LFERhas been discussed by means of the stereo structures of the ternary complexes. The trend of change of the stability for the title systems is governed by the sequence Zn(Ⅱ)>Cd(Ⅱ)<Hg(Ⅱ), and the internal cause has been discussed in terms of the charge/radius effect and ionization potential of the metal ions.

Key words: Group ⅡB metal ion, α-Amino acids, Diketooxime ligand, Stability

CLC Number:

O642.4

TrendMD:

ZHANG Yao-Shan, WANG Zhong-Ming, LIN Hua-Kuan, ZHU Shou-Rong, SUN Hong-Wei, WANG Deng-Guo, CHEN Rong-Ti . Studies On the Stability of Group Ⅱ B Metal Ion-α-amino Acids-diketooxime Ternary Systems[J]. Chem. J. Chinese Universities, 1998, 19(12): 1992.

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Studies On the Stability of Group Ⅱ B Metal Ion-α-amino Acids-diketooxime Ternary Systems

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