Document Details

Document Type : Article In Journal 
Document Title :
MECHANISM OF ELECTRON TRANSFER FOR THE OXIDATION OF TERNARY COMPLEX OF CHROMIUM(III) INVOLVING GUANOSINE AND DL-ASPARTIC ACID WITH PERIODATE
آلية إنتقال الأكترون لأكسدة الكروميوم الثلاثى باستخدام الجاوسن والأسبرتات الثنائى
 
Subject : Enviromental sciences 
Document Language : English 
Abstract : The oxidation of the ternary complex, [Cr(III)(Gu)(Asp)(H2O)2]2+ (Gu = guanosine and Asp = DL-aspartic acid) by periodate in aqueous solution to chromium(VI) has been studied spectrophotometrically over the 25–45o with respect to both [IO4–] and [Cr(III)], and increases with pH over the 2.38–3.68 range. The experimental rate law is consistent with the derived mechanism and the reaction follows the rate law: d[Cr(III)]/dt = (k1K5 + k2K6K1/[H+])[IO4–][Cr(III)]T/{1 + K1/[H+] + (K5 + K1K6/[H+])[IO4–]}, where K1, K5 and K6 are the deprotonation of [Cr(III)(Gu)(Asp)(H2O)2]2+ and pre-equilibrium formation constants for [Cr(III)(Gu)(Asp)(H2O)(OIO3)]+ and [Cr(III)(Gu)(Asp)(OH)OIO3] precursor complexes, respectively. The reaction may follow a 2-step inner-sphere electron transfer mechanism via coordination of IO4– to chromium(III). Thermodynamic activation parameters have been calculated. 
ISSN : 0209-4541 
Journal Name : Oxidation Communications 
Volume : 37 
Issue Number : 1 
Publishing Year : 1435 AH
2014 AD 
Article Type : Article 
Added Date : Tuesday, August 26, 2014 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
H. A. EWAISEWAIS, H. A. Researcher hshalby2002@yahoo.com
I. M. I. ISMAILISMAIL, I. M. I. Researcher  
S. A. AHMEDAHMED, S. A. Researcher  
A. A. ABDEL-KHALEKcABDEL-KHALEKc, A. A. Researcher  

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