New Organic Superconductors β-(BDA-TTP)2X [BDA-TTP = 2,5-Bis(1,3-dithian-2-ylidene)-1,3,4,6-tetrathiapentalene; X- = SbF6-, AsF6-, and PF6-]

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Abstract
The synthesis, electrochemical properties, and molecular structure of a new π-electron donor, 2,5-bis(1,3-dithian-2-ylidene)-1,3,4,6-tetrathiapentalene (BDA-TTP), is described. In contrast to the hitherto-known tetrachalcogenafulvalene π-donors providing organic superconductors, this donor contains only the bis-fused 1,3-dithiole-2-ylidene unit as a π-electron system, yet produces a series of ambient-pressure superconductors β-(BDA-TTP)2X [X = SbF6 (magnetic Tc = 6.9 K, resistive Tc = 7.5 K), AsF6 (magnetic Tc = 5.9 K, resistive Tc = 5.8 K), and PF6 (magnetic Tc = 5.9 K)], which are isostructural. The values of the intermolecular overlap integrals calculated on the donor layers of these superconductors suggest a two-dimensional (2D) electronic structure with loose donor packing. Tight-binding band calculations also indicate that these superconductors have the 2D band dispersion relations and closed Fermi surfaces.

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