A Vinylog of Bis-Fused TTF: Novel π-Electron Framework for Metallic and Superconducting Organic Solids

Abstract

Abstract The first vinylog of bis-fused tetrathiafulvalene (DTEDT) has been synthesized as a new donor component for organic conductors. Many cation radical salts of DTEDT showed metallic conducting behavior down to liquid helium temperature regardless of counter anions. Further, (DTEDT)3Au(CN)2 exhibited superconducting transition at 4 K under ambient pressure. X-Ray crystal structure analysis of (DTEDT)3Au(CN)2 reveals that this salt has a “uniform β-type” arrangement of donor molecules in the conducting sheet. The band calculation indicates it has a closed Fermi surface.