Synthesis, structures, and physical properties of molecular conductors based on unsymmetrical metal-dithiolene complexes

A variety of unsymmetrical metal-dithiolene complexes were newly synthesized by a ligand exchange reaction in refluxing acetone, followed by a HPLC (ODP; acetonitrile — H2O) procedure. Using these unsymmetrical complexes, anion radical salts were prepared with various donor molecules. Among them, four salts show metallic behavior. The electrical resistivity under pressure of EDT-TTF[Ni(dmit)(mnt)], which is isostructural with ambient pressure superconductor α-EDT-TTF[Ni(dmit)2], was also performed.