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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