Speciation in the oxovanadium(IV)/glutathione system

被引：19

作者：

Armas, MT

Mederos, A ^{[1
]}

Gili, P

Domínguez, S

Hernández-Molina, R

Lorenzo, P

Baran, EJ

Araujo, ML

Brito, F

机构：

[1] Univ La Laguna, Dept Quim Inorgan, Tenerife 38204, Canary Isl, Spain

[2] Natl Univ La Plata, Fac Ciencias Exactas, Ctr Quim Inorgan, CEQUINOR,CONICET, RA-1900 La Plata, Argentina

[3] Cent Univ Venezuela, Fac Ciencias, Ctr Equilibrios Soluc, Caracas, Venezuela

来源：

POLYHEDRON | 2001年 / 20卷 / 9-10期

关键词：

oxovanadium(IV) complexes; glutathione; potentiometric and spectrophotometric studies stability constants;

D O I：

10.1016/S0277-5387(01)00694-5

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The complex species formed in aqueous solution (25 degreesC; 1.5 mol dm(-3) KCL and 0.15 mol dm(-3) KNO3 ionic media) between the VO2+ cation and glutathione (H3L) were studied potentiometrically and spectrophotometrically. The application of the least-squares computer program LETAGROP to the experimental emf and UV-Vis data, taking into account hydrolysis of the VO2+ ion, indicated that under the employed experimental conditions (glutathione:vanadyl (IV) ratio 5-50:1, pH range 2-9) only the species in the ligand/metal ratio 2:1, [VO(H3L)(2)](2+), [VO(H2L)(2)], [VO(H2L)(HL)](-) and [VO(HL)(2)](2-) are formed in significant amounts. The stability constants were determined. The species distribution diagrams as a function of pH and the electronic spectra were briefly discussed. (C) 2001 Elsevier Science Ltd. All rights reserved.

引用

页码：799 / 804

页数：6

共 27 条

[1]

BAES CF, 1976, HYDROLYSIS CATIONS, P200

[2]

Baran EJ, 1997, BOL SOC CHIL QUIM, V42, P247

[3] Oxovanadium(IV) and oxovanadium(V) complexes relevant to biological systems [J].