Reaction of N, N1-phenylenebis(salicyalideneiminato)cobalt(III) and l-cysteine in mixed aqueous medium: kinetics and mechanism

被引：13

作者：

Abdulsalam, S. ^{[1
]}

Idris, S. O. ^{[1
]}

Shallangwa, G. A. ^{[1
]}

Onu, A. D. ^{[2
]}

机构：

[1] Ahmadu Bello Univ, Dept Chem, Zaria, Nigeria

[2] Fed Coll Educ, Dept Chem, Zaria, Nigeria

来源：

HELIYON | 2020年 / 6卷 / 04期

关键词：

Inorganic chemistry; Kinetics; Mechanisms; N; N'-phenylenebis(salicyalideneiminato); cobalt(III); l-Cysteine; Mixed aqueous medium; METAL-ION OXIDATIONS; OXYGENATION CATALYSTS; THIOGLYCOLIC ACID; ELECTRON-TRANSFER; ALTERNATING COPOLYMERIZATION; COBALT(III) COMPLEXES; EXCHANGE-REACTIONS; GLUTATHIONE; ELECTROCHEMISTRY; PENICILLAMINE;

D O I：

10.1016/j.heliyon.2020.e03850

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The redox kinetics involving the reaction of N, N'-phenylenebis(salicyalideneiminato)cobalt(III) ([CoSalophen](+)) and l-cysteine (LSH) was studied using pseudo-first order approach under the following conditions, [H+] = 1.0 x 10(-3) mol/dm(3), mu = 0.1 C-2 mol/dm(3) (NaCl), lambda(max) = 470 nm and T = 27 +/- 1 degrees C in DMSO: H2O; 1:4 v: v medium. The redox reaction was 1st order in both [CoSalophen(+)] and [LSH], with the overall 2nd order. Hydrogen ion concentration effect revealed the activeness of both the protonated and deprotonated form of the reductant, positive Bronsted-Debye salt effect and was also ion catalyzed. There was no evidence suggesting an intermediate complex of significant stability in the reaction. Free radical was detected to take part and as such the reasonable mechanistic pathway for the reaction is suggested to be outer-sphere, hence proposed.

引用

页数：8

共 71 条

[1] KINETIC-STUDY OF THE OXIDATION MECHANISM OF GLUTATHIONE BY HYDROGEN-PEROXIDE IN NEUTRAL AQUEOUS-MEDIUM [J].