G. Zotti et G. Schiavon, ELECTROCHEMICAL N-DOPING OF POLY(DITHIENYLVINYLENE) - A COMPARISON OFCYCLOVOLTAMMETRIC AND CONDUCTIVE PROPERTIES IN N-DOPING AND P-DOPING, Synthetic metals, 63(1), 1994, pp. 53-56
Electrochemical n-doping of poly(dithienylvinylene) has been performed
in AN + 0.1 M N(CnH2n+1)4+ClO4-(n = 1,2,3,4 and 6) and compared with
p-doping. Cyclic voltammetry, in situ ESR and UV-Vis spectroelectroche
mistry show that radical anions produced in n-doping are moderately un
stable towards disproportionation whereas, in p-doping, radical cation
s are stabilized by pi-dimerization. In situ conductivity of n-doped p
olymer decreases as the size of the dopant cation increases, suggestin
g charge transport control by interchain hopping. The different conduc
tivities of n- and p-doped polymers are due to the different sizes of
the counterions.