Synthesis and electrical properties of TCNQ radical anion salts with N,N'-ethylenedi(1,3-dithiolan-2-iminium) dication and related dications.

Simple and complex salts of the TCNQ\ewdot radical anion with N,N′-ethylenedi(1,3-dithiolan-2-iminium) dication and related dications, (Remark: Graphics omitted.) (R=H, Me; n=2, 6; m=2, 3, or 4) and (Remark: Graphics omitted.) (m=2, 3) were synthesized. All the salts as compacted samples display semiconducting behaviors in the 77–300 K range. Electrical resistivities of the simple salts are in the range of 1.8×105–9.8×107Ω cm at 25 °C. Electronic absorption spectra and magnetic susceptibilities suggest that the simple salts in the solid state involve (TCNQ)22− dimer. The 1 : 3 complex salt of N,N′-dimethyl-N,N′-ethylenedi(1,3-dithiolan-2-iminium) with TCNQ, (Remark: Graphics omitted.), exhibits a lower electrical resistivity (3.4 Ω cm) than other four complex salts (2.4×10–2.5×103Ω cm). Electronic absorption spectra and magnetic susceptibilities of the both 1: 3 and 1:4 complex salts are interpreted in terms of the interaction between the TCNQ moieties.

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