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Electrochemical Investigation of Potassium Heptacyanorhenate(III) in Aqueous Solution
Author(s) -
Marty Werner,
Renaud Philippe,
Gampp Harald
Publication year - 1987
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19870700215
Subject(s) - chemistry , aqueous solution , protonation , electrochemistry , cyclic voltammetry , electron transfer , potassium , microelectrode , inorganic chemistry , standard electrode potential , electrode , organic chemistry , ion
The electrochemistry of potassium heptacyanorhenate(III) in aqueous solution was studied by cyclic and by rotating disk voltammetry at planar microelectrodes. The results are consistent with a single, reversible electron transfer: Re(CN) 3− 7 + e ⇄Re(CN) 4− 7 with E ′ 0 = 643 mV vs. NHE. A single protonation equilibrium is observed: Re(CN) 4− 7 + H + ⇄ Re(CN) 7 H 3− with p K = 1.31 determined from combined voltammetric and pH data. The Re–CN bond appears to be kinetically inert, and none of the cyano complexes in other oxidation states of Re claimed in the literature was found in the potential range − 2 V to + 1 V.