Citation: Xiang Dong ZHANG, Wei GUAN, Qi Tao LIU, Pin YANG. THE INTERACTION OF Co(Ⅱ), Ni(Ⅱ), Cu(Ⅱ) AND Zn(Ⅱ) WITH 6-AMINOPENICILLANIC ACID IN AQUEOUS SOLUTION[J]. Chinese Chemical Letters, ;1995, 6(6): 531-532.
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The complex formation equilibria of M2+ ions (M=Co, Ni, Cu, Zn) with 6-aminopenicillanic acid (6-APA) have been studied through potentiometric titrations.The results show that all of metal ions form 1:1 complexes (M(APA)+, M(APA) (OH)) with 6-APA in solution.Formation constants of the complexes were determined at 40℃ in aqueous solution having a fixed ionic strength (0.1M NaClO4) and correlated with the second-order rate constants for metal-ion catalysed hydrolysis of penicillin.
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