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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 15, Number 10
BKCSDE 15(10)
October 20, 1994 

pH-Dependent Electrochemical Behavior of N-Monosubstituted-4,4'-Bipyridinium Ions
Joon Woo Park*, Yuna Kim, Chongmok Lee
The pH-dependent reduction behavior of N-monosubstituted-4,4'-bipyridinium ions (RBPY+: R=methyl(C1); 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 (kH) of the homogeneous chemical process is (3.7±0.3) × 103 M-1s-1 for the two electron reduction product of C1BPY+. 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.
896 - 900
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