Abstract
Electrochemical properties of 
and 
have been studied by cyclic voltammetry (CV) in 
containing 0.1 M tetrabutylammonium hexafluorophosphate 
. The electrochemical reductions of 
are reported for the first time. The reduction potential of 
is more positive than that of 
by 1.57 V. The differences in electrochemical properties between 
and 
are parallel to the differences between 
and 
. Based on the relationship between the reduction potential and electron affinity (Ea), the Ea of 
is estimated to be ca. 4.42 eV, which is 1.76 eV larger than that of 
.