Anion-cation interdependency in bedt-ttf charge transfer salts of [MIII(C2O4)]3−

Metal(III)tris(oxalate) charge transfer salts of bis(ethylenedithio)tetrathiafulvalene, bedt-ttf, display a rich variety of magnetic and conducting properties. The series contains both semiconductors and the first molecular superconductor containing paramagnetic d electrons. Most of the compounds in the series follow the general formula (bedt-ttf)4M(C2O4)3. A.solvent (M = metal(III); A = K+, NH4+ or H2O). The conducting properties arise from different arrangements of the bedt-ttf molecules; packing motifs, conformational changes and charge distribution. We examine how changes in the oxalate co-ordination mode can promote specific donor packing motifs.