New cyanofluorene derivatives as electron acceptors in semiconducting complexes

Abstract

9,9′-Bifluorenylidene-3,3′,6,6′-tetracarbonitrile (TCBF) and (3,6-dicyano-9H-fluoren-9-ylidene)propanedinitrile (TCPF) have been synthesized starting from 9-oxo-9H-fluorene-3,6-dicarbonitrile. A 2 : 1 charge transfer complex of TCPF with NNN′N′-tetramethyl-p-phenylenediamine has been obtained, and the electrical and spectral properties investigated. Conductivity measurements performed on polycrystalline samples gave a value of the order of 0.02Ω^–1 cm^–1. These results support the ability of this new acceptor in forming charge-transfer complexes with semiconducting properties.