Document Details

Document Type : Article In Journal 
Document Title :
Inner-sphere oxidation of a ternary dipicolinatochromium(III) complex involving a malonic acid co-ligand
Inner-sphere oxidation of a ternary dipicolinatochromium(III) complex involving a malonic acid co-ligand
 
Document Language : English 
Abstract : The oxidation of a ternary complex of chromium(III), [Cr-III(DPA)(Mal)(H2O)(2)](-), involving dipicolinic acid (DPA) as primary ligand and malonic acid (Mal) as co-ligand, was investigated in aqueous acidic medium. The periodate oxidation kinetics of [Cr-III(DPA)(Mal)(H2O)(2)](-) to give Cr(VI) under pseudo-first-order conditions were studied at various pH, ionic strength and temperature values. The kinetic equation was found to be as follows: where k (6) (3.65 x 10(-3) s(-1)) represents the electron transfer reaction rate constant and K (4) (4.60 x 10(-4) mol dm(-3)) represents the dissociation constant for the reaction and K (5) (1.87 mol(-1) dm(3)) and K (6) (22.83 mol(-1) dm(3)) represent the pre-equilibrium formation constants at 30 A degrees C and I = 0.2 mol dm(-3). Hexadecyltrimethylammonium bromide (CTAB) was found to enhance the reaction rate, whereas sodium dodecyl sulfate (SDS) had no effect. The thermodynamic activation parameters were estimated, and the oxidation is proposed to proceed via an inner-sphere mechanism involving the coordination of IO4 (-) to Cr(III). 
ISSN : 0340-4285 
Journal Name : TRANSITION METAL CHEMISTRY 
Volume : 41 
Issue Number : 6 
Publishing Year : 1437 AH
2016 AD 
Article Type : Article 
Added Date : Thursday, August 3, 2017 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
A BasalehBasaleh, A Researcher  
A Abdel-SalamAbdel-Salam, A Researcher  

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