Complexes with pyrazine-tetrathiafulvalene-dithiolate (pztdt) ligand [M(pztdt)2], M = Ni, Pd, Pt; Synthesis and characterisation

• Extended bisdithiolene metal complexes with fused tetrathiafulvalene and pyrazine moieties.
• Complexes easily oxidised to the neutral state with an extended range of stability.
• Stable neutral transition metal bisdithiolene complexes
• Extended 1D domino-like structure through pyrazine-TTF ligand interactions

The synthesis and characterisation of three metal bisdithiolene complexes based on the recently reported highly extended ligand incorporating fused tetrathiafulvalene and pyrazine moieties, [M(pztdt)2], M = Ni, Pd, Pt and pztdt = pyrazinetetrathiafulvalenedithiolate, are reported. These complexes were obtained under anaerobic conditions as crystals of dianionic tetrabutylammonium salts. The crystal structures of Ni and Pd complexes as determined by single crystal X-ray diffraction confirm the ability of these molecules to established interactions with their neighbours through the pyrazine moieties. These dianionic complexes easily undergo oxidations to their monoanionic and neutral states, with a narrow range of stability for the monoanionic and an extended one for the neutral forms that is rather insoluble in common solvents.

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