Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/14428
Title: <span style="font-size:11.0pt;mso-bidi-font-size: 10.0pt;font-family:"Times New Roman";mso-fareast-font-family:"Times New Roman"; mso-ansi-language:EN-GB;mso-fareast-language:EN-US;mso-bidi-language:AR-SA" lang="EN-GB">Silver(I)-catalysed abstraction of coordinated cyanide in hexacyanoferrate(II) by D-penicillamine in aqueous medium</span>
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: <span style="font-size:11.0pt;mso-bidi-font-size: 10.0pt;font-family:" times="" new="" roman";mso-fareast-font-family:"times="" roman";="" letter-spacing:-.1pt;mso-ansi-language:en-gb;mso-fareast-language:en-us;="" mso-bidi-language:ar-sa"="" lang="EN-GB">The kinetics and mechanism of Ag(I)-catalyzed exchange of coordinated cyanide in hexacyanoferrate(II) by <span style="font-size:11.0pt;mso-bidi-font-size:10.0pt; font-family:" times="" new="" roman";mso-fareast-font-family:"times="" roman";="" letter-spacing:-.2pt;mso-ansi-language:en-gb;mso-fareast-language:en-us;="" mso-bidi-language:ar-sa"="" lang="EN-GB">D-penicillamine (D-PA) have been monitored by following the appearance of blue colored complex [Fe(CN)<sub>5</sub>(D-PA)]<sup>3-</sup>at 423 nm,<span style="font-size:11.0pt;mso-bidi-font-size:10.0pt; font-family:" times="" new="" roman";mso-fareast-font-family:"times="" roman";="" letter-spacing:-.1pt;mso-ansi-language:en-gb;mso-fareast-language:en-us;="" mso-bidi-language:ar-sa"="" lang="EN-GB"> corresponding to metal to ligand charge transfer (MLCT) transition. The effect of <i>p</i>H, 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)<sub>6</sub>]<sup>4-</sup> 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 (I<sub>d</sub>) mechanism which proceeds <span style="mso-bidi-font-style:italic">via formation of a solvent bound intermediate. The activation parameters ΔH<sup># </sup>and ΔS<sup># </sup>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).</span></span></span></span>
Description: 250-256
URI: http://hdl.handle.net/123456789/14428
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.19(4) [July 2012]

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