Abstract:

The structure of dimeric 2,7-bis[4-(trifluoromethyl)phenyl]-4 lambda(4),5 lambda(4),9 lambda(4),10 lambda(4)-tetrathieto[1,2-a:3,4-a']bis[1,2,3,5]dithiadiazole (C8H4F3N2S2)(2) and its adduct with triphenylstibine, (C8H4F3N2S2)(2)center dot C18H15Sb, both have triclinic (P (1) over bar) symmetry. They crystallize in layers containing centrosymmetric clusters consisting of four dithiadiazolyl dimers in the parent compound and two such dimers paired with two triphenylstibine units in the aromatic co-crystal. In the co-crystal, the Ph3Sb molecules associate with an equivalent moiety from a neighbouring cluster in a geometry that is very reminiscent of other Ph3Sb-containing structures. Thus, the adduct combines structural elements from those of its component parts. Key interactions between molecules in the pure dithiadiazolyl (S to S) and the co-crystal (S to C) are significantly shorter than the sums of atom van der Waals radii.