Publication: Synthesis and electrical conductivity of polymers containing trans†1,2†bis(9†carbazolyl)cyclobutane units
Date
01-01-1987
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Abstract
Novel poly‐Schiff bases (PSB's) that contain trans‐1,2‐bis(9‐carbazolyl)cyclobutane(DCZB) units were synthesized by the direct polycondensation of trans‐1,2‐bis(3‐formyl‐9‐carbazolyl)cyclobutane with aromatic diamines in n‐amyl alcohol at 160°C. Complexation of these PSB's and of poly(vinyl DCZB) (PVDCZB) with iodine produced cation‐radical salts which resulted form the transfer of an electron from DCZB moieties to iodine. All the undoped polymers were insulators having electrical conductivity of the order of 10−10–10−12 S cm−1 depending on the structure of polymers. By doping with iodine, the electrical conductivity increased by several orders of magnitude and reached a value of 10−3 S cm−1 in the case of PVDCZB and 10−5–10−6 S cm−1 in the case of PSB's. The electrical conductivity of doped PSB's increased with decreasing diamine length. PVDCZB having the same iodine content per carbazole unit as poly(9‐vinyl‐carbazole) (PVK) has a greater electrical conductivity than PVK. Copyright © 1987 John Wiley & Sons, Inc.