Abstract
Recently, a new class of electron acceptors based on N, N’-dicyanoquinonediimine (DCNQI), and a number of their charge-transfer complexes and anion radical salts have been prepared (1–5). Among them the compound (2,5-DM-DCNQI)2Cu has attracted special interest, because it exhibits very high electrical conductivity (up to 5×105 S cm−1 below 10 K) and retains its metallic behavior down to 1.3 K without metal-insulator transition (3). Anion radical salts with other counterions exhibit lower conductivities and are semiconductors, or undergo a Peierls transition in the temperature range 100–150 K (4).
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