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Study of Binary Complexes of Several Transition Metal Ions with D-Naproxen in Methanol—Water Medium by Potentiometry

Y. C. Zhu, S. C. Yan, X. N. Dong, G. F. Zuo, J. G. Wu, and R. W. Deng

Department of Chemistry, Tianshui Normal University, Tianshui, Gansu 741001, P. R. China



Received: 8 January 2002

Abstract: Binary complexes of D-naproxen (HL) with several transition metal ions M(II) (M = Cd, Co, Ni,Cu, and Zn) were studied potentiometrically in 60 vol. % methanol—water at 25°C and I(KNO3)= 0.2 mol dm−3. The stability constant of binary complexes was estimated by using the computerprograms MINIQUAD and MIQUV. For the ligand, the protonation constant increased, while thecontent of methanol increased in mixed solvent. The results show that the stability constants of thebinary complexes ML2 for the different metal ions, which were found to be βCdL2 < βCoL2 < βNiL2< βCuL2 > βZnL2 , have an Irving—Williams order.

Full paper in Portable Document Format: 572a87.pdf


Chemical Papers 57 (2) 87–90 (2003)

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