G. Zotti et al., NOVEL, HIGHLY CONDUCTING, AND SOLUBLE POLYMERS FROM ANODIC COUPLING OF ALKYL-SUBSTITUTED CYCLOPENTADITHIOPHENE MONOMERS, Macromolecules, 27(7), 1994, pp. 1938-1942
A series of 4-n-alkyl- and 4,4-di-n-alkyl-substituted cyclopentadithio
phenes (C(n)CPDT and (Cn)2CPDT, n = 1, 3, 4, 6, 8, and 16) were synthe
sized and polymerized by anodic coupling in 0.1 M TEAP + AN. Electroch
emistry, OR and electronic spectroscopies, elemental analysis, and in
situ conductivity indicate that the polymers are oxidized to the condu
ctive state (0.5 anion per monomeric unit) in two steps and in a singl
e step for poly[C(n)CPDT] and poly[(C(n))2CPDT], respectively. The pol
ymers are highly conductive (80-300 S/cm for poly[C(n)CPDT] and 2-40 S
/cm for poly[(C(n))2CPDT]) and soluble in CHCl3 (degree of polymerizat
ion = 10-40 for poly[C16CPDT] and for poly[C4)2CPDT]). Absorption maxi
ma, in the range 545-605 nm, are anomalously red shifted to 640 and 68
0 for poly[(C8)2CPDT] and poly[(C16)2CPDT].