Prominent role of disulfide bridge in (D)(2)(CuCl4)-Cl-II where D is the S-positions isomer of ethylenedithiodimethylthiotetrathiafulvalene (EDT-DMT-TTF)

A radical cation salt (D+)(2)CuCl42-, where D is the S-positions isomer of ehylenedithiodimethylthiotetrathiafulvalene (EDT-DMT-TTF), was prepared and its crystal structure was determined by X-ray diffraction at room temperat ure. It belongs to the quadratic I<(4)over bar $>2d space group with a 22.5 9(1) Angstrom, c 7.106(6) Angstrom, V = 3626(2) Angstrom(3), Z=4, R=0.030, R-w,=0.039. The structure is built up from regular zig zag donors stacks. T he 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 ro le of disulfide bridge engaged in Van Der Waals contacts, added to.