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Comparative study of the catalytic effect of Ag(I) and Hg(II) on the exchange of cyanide by 4-cyanopyridine in hexacyanoferrate(II): a kinetic approach

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Abstract

The kinetic effect of catalytic activities of Ag(I) and Hg(II) was subjected to compare spectrophotometrically in homogeneous medium. The exchange of cyanide by 4-cyanopyridine (4-CNpy) in hexacyanoferrate(II) was found to be catalyzed by both the catalysts under similar reaction conditions, and therefore used for the comparison. The effects of several experimental parameters on the substitution were studied at 477 nm; these include concentrations of ligand, complex, and catalysts, pH, ionic strength and temperature. The results showed that Hg(II) provided better catalytic effect than Ag(I) for the abstraction of cyanide ions. Activation energies were calculated for each case and found to be 55.30 and 52.13 kJmol−1, respectively, for Ag(I)-catalyzed and Hg(II)-catalyzed substitutions. The catalytic efficiencies for each catalyst were also calculated using Lineweaver–Burk plot and found to be 7.65 × 103 M−1s−1 for Ag(I) and 9.06 × 103 M−1s−1 for Hg(II), respectively.

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Acknowledgments

One of the authors, Mr. Abhas Asthana is grateful to Council for Scientific and Industrial Research (CSIR), New Delhi, India for providing financial assistance.

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  1. Department of Chemistry, University of Lucknow, Lucknow, 226007, UP, India

    Radhey M. Naik, Abhas Asthana & Shiv B. Singh Yadav

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  1. Radhey M. Naik
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  2. Abhas Asthana
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  3. Shiv B. Singh Yadav
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Correspondence to Radhey M. Naik.

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Naik, R.M., Asthana, A. & Yadav, S.B.S. Comparative study of the catalytic effect of Ag(I) and Hg(II) on the exchange of cyanide by 4-cyanopyridine in hexacyanoferrate(II): a kinetic approach. J IRAN CHEM SOC 12, 519–528 (2015). https://doi.org/10.1007/s13738-014-0509-4

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