Temperature Dependence of Crystal Structures, and Electrical Conducting and Magnetic Properties in Plate Crystals of 1:2 Tetrafluorotetracyanoquinodimethane/Tetrafluorotetracyanoquinodimethanide Mixed Tetramethyl-Ammonium and -Phosphonium Salts

The structure of a plate crystal of ((PMq + . TCNQF 4 − ) 1/2TCNQF 4 ) was analyzed and very similar to that of the corresponding NMe 4 + salt. However, significant difference was recognized between the two crystals in the structures of TCNQF 4 and TCNQF 4 − molecules, and especially in the contacts between the two TCNQF 4 − molecules in dimerization and between the TCNQF 4 and TCNQF 4 − molecules. The change in both molecular structure and contact as above was also observed at a lowering temperature. The magnitude in change was larger in the NMe4 + salt than in the PMe 4 + salt. However, the change exerted no special influence on the elctrical conducting and magnetic properties.