Please use this identifier to cite or link to this item:
http://nopr.niscpr.res.in/handle/123456789/14428| Title: | Silver(I)-catalysed abstraction of coordinated cyanide in hexacyanoferrate(II) by D-penicillamine in aqueous medium |
| Authors: | Naik, R M Tiwari, R K Yadav, S B S Kumar, B Asthana, A |
| Keywords: | D-penicillamine;Hexacyanoferrate(II);Kinetics;Spectrophotometry |
| Issue Date: | Jul-2012 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | The kinetics and mechanism of Ag(I)-catalyzed exchange of coordinated cyanide in hexacyanoferrate(II) by D-penicillamine (D-PA) have been monitored by following the appearance of blue colored complex [Fe(CN)5(D-PA)]3-at 423 nm, corresponding to metal to ligand charge transfer (MLCT) transition. The effect of pH, ionic strength, catalyst concentration and concentration of hexacyanoferrate(II) and D-penicillamine on the rate of reaction has also studied and explained. The findings indicate first order dependence each in [Fe(CN)6]4- and [D-PA]. The composition of the complex formed has been established to be 1:1 by mole ratio and slope ratio method. The kinetic observations suggest that the substitution follows an interchange dissociative (Id) mechanism which proceeds via formation of a solvent bound intermediate. The activation parameters ΔH# and ΔS# have also been calculated and provided in support of the proposed mechanistic scheme. It is observed first time that the drug D-penicillamine used acts as a potential ligand and it can replace the coordinated cyanide in hexacyanoferrate(II). |
| Page(s): | 250-256 |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Appears in Collections: | IJCT Vol.19(4) [July 2012] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJCT 19(4) 250-256.pdf | 102.36 kB | Adobe PDF | View/Open |
Items in NOPR are protected by copyright, with all rights reserved, unless otherwise indicated.