A Radical Anion Salt of 2,5‐Dimethyl‐N,N′‐dicyanoquinonediimine with Extremely High Electrical Conductivity

Metallic conductivity that increases continuously up to 1.3 K and achieves values of over 500000 S cm−1 is exhibited by single crystals of the radical-anion salt depicted here, which was prepared by electrocrystallization. The multidimensional electronic conductivity is discussed on the basis of the crystal structure. The CuI ions are arranged in chains, each of which is surrounded by four stacks of dicyanoquinonediimine radical anions (one negative charge per “dimer”).