Synthesis and Solid-State Polymerization of Diacetylene with Tetrathiafulvalene and the Electronic Properties

Abstract

We synthesized a new diacetylene monomer with urethane groups in the middle of the substituents and tetrathiafulvalene (TTF) moieties at both ends (BT). BT was found to form the CT complex with tetrafluorotetracyanoquinodimethane (F₄TCNQ) to be (BT)(F₄TCNQ)₂. BT could be polymerized in the solid state to give irregular conjugated structure by UV irradiation although the solid-state polymerization of the CT complex was not confirmed. Morphology of their cast films was observed by AFM. The films of (BT)(F₄TCNQ)₂ before and after UV irradiation showed semiconducting temperature dependence with activation energies of 0.19 and 0.16 eV, respectively, and the electrical conductivities at room temperature were found to be more than 10⁻⁵ Scm⁻¹.

Acknowledgment

This study was supported by a Grant-in-Aid for for Challenging Exploratory Research from Japan Society for the Promotion of Science.