keywords: Amino acid, redox reaction, bis[bis(ethylenediamine)succinimidato-cobalt(III)]dinitrate dihydrate complex
Redox reaction of the ¬¬glutamic acid, (Glu) and synthesized bis[bis(ethylenediamine)succinimidato-cobalt(III)]dinitrate dehydrate, (suc)(en)2Co(µ-O2)Co(en)2(suc)](NO3)2.2H2O hereby referred Co(O2)Co2+ has been studied in aqueous hydrochloric acidic medium at wavelength 420 nm and temperature 27 ± 1oC. The rate shows first order dependence each on Co(O2)Co2+, [Glu], and [H+]. The overall rate equation for the reaction can be shown below: Michaelis-Menten plot is linear and passes through the origin and spectroscopic studies indicate no significant shift from the absorption maximum characteristic. Variation of the ionic strength in the range 1≤I≤1.2 mol dm-3 indicates a positive Bronsted-Debye salt effect. The rate laws proposed is in agreement with the experimental results discussed and an outersphere mechanistic pathway is probably in operation in this reaction.
Alhaji NMD & Sofiya LMS 2011. Kinetics and mechanism of oxidation of Glutamic acid by N-bromophthalimide in aqueous acidic medium. E-Journal of Chemistry, 8(4): 1472-1477. Arthur EM 1982. Oxidation of organic substrates with dioxygen complexe as intermediate. Pure & Appl. Chem., 55(1): l25—135. Avinash K, Mukesh K & Ashok K 2012. Kinetics and mechanism of oxidation of Glutamic acid with Bi (V) phosphate complex. Oriental J. Chem., 28(2): 901-906. Hassan AE, Eman SH & Ahmed A 2001. Kinetic and mechanisms of oxidation of chromium(III)-L-glutamic acid complex by periodate. Indian J. Chem., 40A: 410-414. Huck HM & Wieghardt K 1980. Outer-sphere electron-transfer reactions of binuclear complexe of cobalt(III): assessment of an inductive effects on the rates. A linear relationship between the selectivity of redox reactions and the reduction of potential of the reductants. Inorganic Chemistry, 19(12): 3688 – 3695. Idris SO 2005. Some electron transfer reactions of Cr(VI) and of tetrakis(2,2-bipyridine-)-µoxodiiron(III) complex. Ph.D Thesis. Department of Chemistry, Ahmadu Bello University, Zaria. Iyun JF, Lawal HM & Olagbemiro TO 1995. Kinetic and mechanism of oxidation of 1,4-benzenediol by trioxalatocobaltate(III) ion in aqueous acid medium. Indian J. Chem., 34(A): 446 – 447. Iyun JF, Ayoko GA & El-Idris IF 1993. Electron transfer at tetrahedral cobalt(II), Part IV: Kinetics of silver(I) catalysed chlorate reduction. Transition Metal Chemistry, 18: 275-278. Mahadevappa DS, Puttaswamy & Made Gowda NM 1988. Chromium (III) L-glutamic acid complex by periodate. Indian J. Chem., 40A: 410 – 414. Mahadevappa DS, Rangappa KS & Gowda NMM 1981. Kinetics and mechanism of oxidation of L-threonine in acid media by sodium N-chloro-p-toluene sulfonamide. J. Physical Chem., 85: 3651-3659. Mamman S & Iyun JF 2007. Kinetics and mechanisms of the reactions of benzenediols with binuclear oxalato cobaltate(III) complex. Int. J. Pure & Appl. Chem., 2: 407-413. Mohamed NAF, Seyed GAD, Murugesan A & Kanagaraj M 2004. Kinetic of oxidation of some essential amino acids by N-chlorosaccharin in aqueous acetic acid medium. E-journal of Chemistry, 11(2): 132-136. Orphan B 2009. Synthesis and structural characterization of novel peroxo bridged binuclear cobalt(III) complex of succinimide showing three varieties of hydrogen bonding interaction. J. Chem. Sci., 121(3): 267-273. Pushphalatha L & Vivekanandan K 2009. Oxidative kinetics of serine and threonine by N-bromonicotinamide. J. Indian Chem. Soc., 86(5): 475-480. Puttaswamy A & Nirmala V 2011. Kinetics of oxidation of acidic amino acids by sodium n-bromobenzenesulphonamide in acid medium: A mechanistic approach. Proc. Indian Academic Science (Chem. Sci.), 113(4): 325 – 332. Singh AK, Jain B, Negi R, Katre Y, Singh SP & Sharma VK 2010. Synthetic Reaction Inorganic: Metal-Org Nano-Metal Chem., 40: 71-77. Yousuf HM & Firoz A 1989. A comparative kinetic and mechanism study glutamine acid oxidation by acid permanganate in the absence and presence of sodium dodely 1 sulphate. Transition Metal Chemistry, 14: 169-174.