(DTEDT)[Au(CN)2]0.4: An Organic Superconductor Based on the Novel π‐Electron Framework of Vinylogous Bis‐Fused Tetrathiafulvalene

Below 4 K the [Au(CN)2] salt of the radical cation of 1 shows superconductivity. The X-ray structure analysis reveals that this salt has a two-dimensional array of donors. The relatively large interactions between the stacks result in a closed Fermi surface.