Document Details

Document Type : Article In Journal 
Document Title :
Mechanism of electron transfer reaction of ternary dipicolinatochromium(III) complex involving oxalate as secondary ligand
آلية تفاعل نقل الألكترون فى مركب الكروم الثلاثى فى وجود الأكسالات كوسيط
 
Subject : Enviromental sciences 
Document Language : English 
Abstract : Mechanism of the oxidation of [CrIII(DPA)(OX)(H2O)]− (DPA = dipicolinate and OX = oxalate) by periodate in aqueous acidic medium has been studied spectrophotometrically over the pH range of 4.45–5.57 at different temperatures. The reaction is first order with respect to both [IO− 4 ] and the complex concentration, and it obeys the following rate law: d[CrVI]/dt = k6K4K6[IO− 4 ][CrIII]T/{([H+] + K4) + (K5[H+] + K6K4)[IO− 4 ]}. The rate of the reaction increases with increasing pH due to the deprotonation equilibria of the complex. The experimental rate law is consistent with a mechanism in which the deprotonated form [CrIII(DPA)(OX)(OH)]2− is more reactive than the conjugated acid. It is proposed that electron transfer proceeds through an inner-sphere mechanism via coordination of IO− 4 to chromium(III). Thermodynamic activation parameters were calculated using the transition state theory equation. 
ISSN : 0974-3626 
Journal Name : Indian Academy of Sciences. 
Volume : 125 
Issue Number : 5 
Publishing Year : 1434 AH
2013 AD 
Article Type : Article 
Added Date : Thursday, December 12, 2013 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
HASSAN AMROUN EWAISEWAIS, HASSAN AMROUNResearcher hshalby2002@yahoo.com
IQBAL ISMAILISMAIL, IQBAL Researcher  

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