Abstract

Crystals that result from the electrocrystallization of a 1:1 mixture of the organic donor molecules ET and MET with the I 3- anion are superconducting at ambient pressure, T c = 4.6 K. Single crystal X-ray diffraction investigations (298 K) show that the crystals are ß-(ET) 2I 3 and little or no MET is incorporated. However, at 125 K no modulated structure is observed, instead the ethylene groups of the ET molecule are ordered. The conformation of the ET molecule is the same as that observed in ß ∗-(ET) 2I 3, the high pressure form of ß-(ET) 2I 3, with T c ∼ 8 K.

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