Molecular design of a “neutral metal” composed of a single component molecule

Novel neutral nickel complex with the extended TTF dithiolato ligand, propylenedithiotetrathiafulvalenedithiolate[ptdt 2- =(S 8 C 9 H 6 ) 2- ]. have been synthesized. The single crystal of Ni(ptdt) 2 revealed an extremely high electrical conductivity(7 S cm -1 ) at room temperature as a neutral molecular crystal. High -pressure resistivity measurements were made up to 72kbar. On the basis of the band structure calculation, the requirements for the development of molecular metals composed of single molecules are described.