ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

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

E-mail: yczhu@tsnc.edu.cn

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 β_CdL2 < β_CoL2 < β_NiL2< β_CuL2 > β_ZnL2 , have an Irving—Williams order.

Full paper in Portable Document Format: 572a87.pdf

Chemical Papers 57 (2) 87–90 (2003)