049ChemInform Abstract The title compound is obtained by in situ electrocrystallization of bis(ethylenedithio)tetrathiafulvalene (ET) by use of a 1:1 mixture of CuBr and tetraphenylphosphoniumdicyanamide. An X-ray analysis (space group Pnma, Z=4) shows that the structure contains alternating layers of the donor molecule cations and polymeric mixed halo(pseudohalo)cuprate(I) anions. It is established that the title compound is the organic superconductor with the highest transition temp. found to date.

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Recent advances in the design and synthesis of organic synthetic metals have yielded materials that have the highest superconducting transition temperatures (T(c) approximately 13 kelvin) reported for these systems. These materials have crystal structures consisting of alternating layers of organic donor molecules and inorganic anions. Organic superconductors have various electronic and magnetic properties and crystal structures that are similar to those of the inorganic copper oxide superconductors (which have high T(c) values); these similarities include highly anisotropic conductivities, critical fields, and short coherence lengths. The largest number of organic superconductors, including those with the highest T(c) values, are charge-transfer salts derived from the electron donor molecule BEDT-TTF or ET [bis(ethylenedithio)-tetrathiafulvalene]. The synthesis and crystal structures of these salts are discussed; their electrical, magnetic, and band electronic structure properties and their many similarities to the copper oxide superconductors are treated as well.

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