Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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pH-Dependent Electrochemical Behavior of N-Monosubstituted-4,$4^{\prime}$-Bipyridinium Ions

  • Park, Joon-woo (Department of Chemistry, Ewha Womans University) ;
  • Kim, Yuna (Department of Chemistry, Ewha Womans University) ;
  • Lee, Chong-Mok (Department of Chemistry, Ewha Womans University)
  • Published : 1994.10.20
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Abstract

The pH-dependent reduction behavior of N-monosubstituted-4,4'-bipyridinium ions ($RBPY^+: R=methyl(C_1)$; benzyl; n-octyl; n-dodecyl) has been investigated by electrochemical and spectroelectrochemical techniques. At acidic condition, $RBPY^+$ is protonated and the protonated species are reduced by two consecutive one-electron processes. The $2e^-$ reduced species undergoes a chemical reaction with $H^+$. The second-order rate constant $(k_H)$ of the homogeneous chemical process is $(3.7{\pm}0.3){\times}10^3M^{-1}s^{-1}$ for the two electron reduction product of $C_1BPY^+$. At high pH, the electrode reduction of $RBPY^+$ is one-step $2e^-$ transfer process with concomitant addition of $H^+$, which is confirmed by cyclic voltammetric study using a microdisk electrode.

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