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A new molecular superconductor based on BEDT-TTF molecule was prepared electrochemically by using the mixed supporting electrolyte, (n-C4H9)4NI3 and (n-C4H8)4NAuI2. The superconducting transition takes place at ambient pressure at 3.6 K. X-Ray diffraction patterns show that the system can be approximately assigned to a pseudo orthorhombic one with the lattice constants of a=10.076(2), b=33.853(5), c=4.964(1) Å.

The crystal of a new ambient-pressure superconductor, κ-(BEDT-TTF)2I3 belongs to the monoclinic system with space group P21/c and a=16.387, b=8.466, c=12.832 Å and β=108.56°. The 2-dimensional(2D) metal sheets composed of paired BEDT-TTF molecules and the I3 anion sheets are arranged alternately along the a. direction. The orientation of the neighbouring paired molecules is almost perpendicular to each other.

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