Synthesis, characterization, and electrical conductivity of polyesterification products with tetrathiafulvalene units, and their TCNQ complexes

Polyesterification products with tetrathiafulvalene units 3a–e were prepared from tetrathiafulvalenedicarbonyl dichloride (1) and various α,ω‐diols (2a–e) containing 2 to 16 methylene groups. The red to brown products 3a–e with melting points between 235°C and 128°C are insoluble in all common organic solvents, except for 3e which is soluble in hot DMF. Molecular weights determined by vapor pressure osmometry as well as from elemental analysis data have been found to be ≥2000. The structures were proved by IR, MS, and electronic spectra. The electrical conductivities of 3a–e are between 4 . 10‐8 and 4 · 10‐13 Ω‐1· cm‐1. In TCNQ complexes the electrical conductivities are enhanced by one to five orders of magnitude.