Molecular Design and Development of Single-component Molecular Metals with Extended TTF Ligands

Abstract

The novel neutral nickel complex with the extended TTF dithiolato ligand, trimethylenedithiotetrathiafulvalenedithiolate[tmdt 2 m = (S 6 C 9 H 6 ) 2 m ], have been synthesized. The single crystal of [Ni(tmdt) 2 ] was metallic down to 0.6 K. The crystal structure and electronic band structure calculation showed [Ni(tmdt) 2 ] is the first single-component molecular metal with three-dimensional Fermi surfaces. Metallic behavior was also found in the crystal of an analogous molecule, [Ni(dmdt) 2 ][dmdt 2 m = dimethyltetrathiafulvalenedithiolate]. Similar highly conducting systems, [Au(dmdt) 2 ] and the molecular conductor with localized S = 1/2 spins, [Cu(dmdt) 2 ] were also prepared. extended TTF ligand single-component molecular metal three-dimensional molecular metal