NISCAIR Online Periodicals Repository

Research Journals >
Indian Journal of Chemistry -Section A (IJC-A) >
IJC-A Vol.46A [2007] >
IJC-A Vol.46A(04) [April 2007] >

Title: Kinetic studies of substitution on [(H₂O)(tap) ₂RuORu(tap)₂(H₂O)]²⁺ ion by DL-penicillamine at physiological pH
Authors: Ghosh, Alak Kumar
Issue Date: Apr-2007
Publisher: CSIR
Abstract: The reaction of DL-penicillamine with the title complex has been studied spectrophotometrically in aqueous solution as a function of concentrations of the substrate complex and ligand, pH and temperature. The reactivity of different donor centers [i.e., (N), (N,O) and (O,O)] have been compared. At pH 7.4 the reaction is a two-step process. Unlike other systems studied with the same substrate, the second step in the present case is ligand independent, ascribed to the lower difference between the two steps (k₁ = 1.78×10⁻³ s1and k₂ = 0.67×10⁻⁴ s⁻¹ respectively at 50°C) in comparison to the other systems studied earlier (k₁~10⁻³s⁻¹ and k₂~10⁻⁵s⁻¹). An associative interchange mechanism is proposed for both the steps. The activation parameters (ΔH₁ = 19.2 ± 1 kJ mol⁻¹, ΔS₁ = -239 ± 3 JK⁻¹ mol⁻¹; ΔH₂ = 65.6 ± 5.8 kJ mol⁻¹ and ΔS₂ = 123 ± 17 JK⁻¹ mol⁻¹) support the proposition. The activation parameters have been compared with other systems studied earlier.
Page(s): 610-614
ISSN: 0376-4710
Source:IJC-A Vol.46A(04) [April 2007]

Files in This Item:

File Description SizeFormat
IJCA 46A(4) (2007) 610-614.pdf257.63 kBAdobe PDFView/Open
 Current Page Visits: 98 
Recommend this item


Online Submission of Articles |  NISCAIR Website |  National Knowledge Resources Consortium |  Contact us |  Feedback

Disclaimer: NISCAIR assumes no responsibility for the statements and opinions advanced by contributors. The editorial staff in its work of examining papers received for publication is helped, in an honorary capacity, by many distinguished engineers and scientists.

CC License Except where otherwise noted, the Articles on this site are licensed under Creative Commons License: CC Attribution-Noncommercial-No Derivative Works 2.5 India

Copyright © 2015 The Council of Scientific and Industrial Research, New Delhi. All rights reserved.

Powered by DSpace Copyright © 2002-2007 MIT and Hewlett-Packard | Compliant to OAI-PMH V 2.0

Home Page Total Visits: 163247 since 01-Sep-2015  Last updated on 21-Jun-2016Webmaster: