Preparation and Electrical Conductivity of Some Simple and Complex Salts Formed between N,N-Dialkyl-1,3-dichalcogena-cycloalkan-2-iminium and TCNQ

Four simple salts and six complex salts of TCNQ radical anion with N,N-dialky1-1,3-dichalcogenacycloalkan-2-iminium cations, (Remark: Graphics omitted.) and (Remark: Graphics omitted.) (n=2 or 3, Y=S or Se, R=Me or Et) were prepared. The electrical resistivity of (Remark: Graphics omitted.) (1.1×104 ohm cm) was more than 10 times lower than other three simple salts ((6.1–8.7)×105 ohm cm). Electronic absorption spectra and magnetic susceptibilities suggest that the latter three involve dimeric (TCNQ)22−, while in the former the interaction between two TCNQ radical anions is weak in the solid state. All the complex salts with compaction samples exhibited the resistivity of 2.4–4.0 ohm cm with very low activation energies (0.018–0.087 eV). Electronic spectra and magnetic susceptibilities show that the interaction between two TCNQ radical anions decreases owing to the implication of neutral TCNQ.