THE 1ST AMBIENT PRESSURE ORGANIC SUPERCONDUCTOR CONTAINING OXYGEN IN THE DONOR MOLECULE, BETA-M-(BEDO-TTF)3CU2(NCS)3, TC=1.06 K

In this communication, we report the discovery of superconductivity in an organic charge-transfer salt containing an oxygen-bearing organic-donor molecule. A review of the literature1on organic conductors and superconductors reveals that all such superconductors are based on Se- or S-containing organic electron-donor molecules. In fact, an increasingly large number of ambient-pressure organic superconductors occur as the atomic number of the chalcogen atoms in the electrondonor molecule decreases from Se to S. So far, one ambient-pressure superconductor has been discovered in an all-Se-containing system, (TMTSF)2C104(TC~= 1.1 K),2 and at least nine such superconductors are found in S-containing systems based on BEDT-TTF.3 and a copper-containing inorganic anion. We describe herein the synthesis of this new material, its crystal structure, its characteristic ESR properties, inductive measurements of its superconducting transition, and its band electronic structure. © 1990, American Chemical Society. All rights reserved.