Studies on the Stability of L-Threonic Acid-α-aminoacids(5-Substituted Phenanthrolines)-copper(Ⅱ) Ternary Complexes

Abstract

Abstract: The formation constant of α-aminoacids(5 substituted phenanthrolines)-L-threonic-acid-copper(Ⅱ) ternary complexes were determined at 298 K, I =0.1 mol/L KNO₃. The two biologically active ligand, α-aminoacid and L-threonic acid accommodate each other when coordinated to copper(Ⅱ) ion. The stability of ternary complex is larger than that of the corresponding binary complex. This result indicates that, as a ligand, L-threonic acid can serve as a carrier transport metal ions effectively in vivo. The percentage of ternary complex is obviously larger than that of binary complex in a wide pHrange. The formation constant of the ternary complexes linearly increase with the increase of protonation constant of α-aminoacid and the stability of its binary complexes. Linear free energy relationship(LFER) does exist in the presence of ternary system. Alcoholic proton in L-threonic acid was dissociated with a pK_a larger than that in binary complex. In 5-substituted phenanthroline L-threonic acid-copper(Ⅱ) ternary system, the stability of the ternary complex decreases with the increase of protonation constant of 5-substituted phenanthroline due to d-p π back-bonding.

Key words: L-Threonic acid, α-Aminoacid, 5-Substituted phenanthroline, Copper(Ⅱ) ternary complex, Stability

CLC Number:

O614.33

TrendMD:

SUN Xiang-De, YIN Xiang-Chen, ZHU Shou-Rong, LIN Hua-Kuan, CHEN Rong-Ti, ZHANG Xing-Yuan . Studies on the Stability of L-Threonic Acid-α-aminoacids(5-Substituted Phenanthrolines)-copper(Ⅱ) Ternary Complexes[J]. Chem. J. Chinese Universities, 1998, 19(6): 849.

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Studies on the Stability of L-Threonic Acid-α-aminoacids(5-Substituted Phenanthrolines)-copper(Ⅱ) Ternary Complexes

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