Development of single-component molecular metals based on extended-TTF dithiolate ligands

Abstract

The novel nickel complex with the extended-TTF dithiolate ligand [Ni(tmdt) 2 ] (tmdt 2- =trimethylenedithiotetrathiafulvalenedithiolate) is the first three-dimensional single-component molecular metal. Structures and physical properties of analogous single-component molecular conductors [Ni(dmdt) 2 ] (dmdt 2- =dimethyltetrathiafulvalenedithiolate), [Ni(eodt) 2 ] (eodt 2- =ethylenedioxytetrathiafulvalenedithiolate) and [Pd(C3-tdt) 2 ] [(C3-tdt) 2- =dipropylthiotetrathiafulvalenedithiolate] were examined. The structure of [Au(tmdt) 2 ] was determined by synchrotron radiation powder diffraction experiments and the MEM/Rietveld analysis. The single-component paramagnetic molecule [Cu(dmdt) 2 ] was also studied to clarify the possibility of single-component magnetic molecular conductors.