Abstract
An unusual homogeneous chemical reaction of a direct cyanation of ferricenium salts by hydrocyanic acid is analyzed on the basis of an electrochemical approach and the notions of the chemistry of coordination compounds about an inner-sphere electron transfer. The complexing between a ferricenium cation and cyanide anion is confirmed experimentally using a potentiometric titration of aqueous solutions of ferricenium tetrafluoroborate by hydrocyanic acid. Variations of the mechanism of a rebound substitution of the CN group in the cyclopentadienyl ring for the hydrogen atom are considered. The mechanism is based on the notion about an inner-sphere redox reaction between the Fe(III) atom of a ferricenium cation and the CN- anion. The magnitude and sign of the difference between standard potentials of systems [(C5H5)2M)]+/(C5H5)2M and CN+/CN- are found to represent a thermodynamic criterion indicating whether cations of metallocenes [(C5H5)2M]+ may be directly cyanated by hydrocyanic acid.
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Dedicated to the memory of Academician A.N. Nesmeyanov, in connection with his centennial.
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Nekrasov, L.N., Yur’eva, L.P. Electrochemical approach to direct homogeneous chemical cyanation of ferricenium salts: The complexing of system components. Russ J Electrochem 36, 299–307 (2000). https://doi.org/10.1007/BF02827974
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DOI: https://doi.org/10.1007/BF02827974