Prominent role of disulfide bridge in (D)2CuIICl4 where D is the S-positions isomer of ethylenedithiodimethylthiotetrathiafulvalene (EDT-DMT-TTF)

A radical cation salt (D+)2CuCl42−, where D is the S-positions isomer of ethylcnedithiodimethylthioletrathiafulvalene (EDT-DMT-TTF), was prepared and its crystal structure was determined by X-ray diffraction at room temperature. It belongs to the quadratic Ī42d space group with a = 22.59(1) å, c = 7.106(6) å, V = 3626(2) å3, Z=4, R=0.030, Rw=0.039. The structure is built up from regular zig zag donors stacks. The long axis of organic molecules of neighbouring stacks are perpendicular one from each other. This leads, with respect of anion tetrahedral geometry, to an unusual high symmetry. This main feature is due to the prominent role of disulfide bridge engaged in Van Der Waals contacts, added to.