X-RAY CRYSTAL-STRUCTURE OF (CNSSS)(2)(M)(2) (M = ASF6-, SBF6-, SB2F11-)

The crystal structures of (CNSSS)(2)(AsF6)(2), (CNSSS)(2)(SbF6)(2), an d two phases of (CNSSS)(2)(Sb2F11)(2) have been determined. The AsF6-, SbF6-, and alpha-Sb2F11- salts crystallize as reddish-brown plates wh ereas the beta-Sb2F11- salt crystallizes as green rods. The dication . +SSSNCCNSSS+. (1(2+)) is the same in all four structures and consists of two 7 pi rings linked by a sp(2)-sp(2) C-C bond (1.462 Angstrom in 1(AsF6)(2)). The packing in the four structures is similar with stacks of dications along the a-axis and alternating sheets of dications and anions lying in the be-plane. The differences in the dication-dicatio n contacts is reflected in the variable temperature magnetic data.