Bisdithiolene complexes based on an extended ligand with TTF and pyridine moieties

The synthesis and characterization of a new extended tetrathiafulvalene (TTF) dithiolene ligand substituted with alkyl pyridine groups, pyridylethylsulfanyltetrathiafulvalenedithiolene (pesdt2−), as well as the corresponding gold (III) complex [Au(pesdt)2]− obtained as a tetrabutylammonium salt are described. The oxidation potential of this complex is rather low and the paramagnetic neutral complex is obtained as an electrically insulating microcrystalline powder.

Graphical abstractThe synthesis and characterization of a gold bisdithiolene complex [Au(pesdt)2]− based on a novel extended dithiolene ligand containing both tetrathiafulvalene and pyridyl moieties (pesdt2− = pyridylethylsulfanyltetrathiafulvalenedithiolene) are reported.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Synthesis of the first pyridine substituted extended dithiolene ligand with TTF moieties (pesdt2−). ► Preparation of a new monoanionic AuIII bisdithiolene (n-Bu4N) [Au(pesdt2)]. ► A new neutral gold complex [Au(pesdt2)] which is paramagnetic, but not a good electrical conductor. ► [Au(pesdt2)] presents an EPR signal centered at 2.0026 with an effective magnetic moment of ~ 1.75 μB/fu at room temperature.