Redox-active TTF carboxylate as an axial bridging ligand for dirhenium metal–metal bonded complexes

• New dirhenium complexes equatorially bridged by tetrathiafulvalene-monocarboxylate.
• Structural analyses showed that the TTF core remains neutral.
• The 2nd oxidation of the [TTFCO2]− ligand is stabilized by the Re2III,III core.

Tetrathiafulvalene monocarboxylate, [TTFCO2]−, was used as a carboxylate bridging ligand for three new dirhenium complexes. The acetate ligands of cis-Re2(dppm)2Cl2(OAc)2, trans-Re2(dppm)2Cl4(OAc), and cis-Re2Cl4(OAc)2 are displaced by TTFCO2H to form cis-Re2(dppm)2Cl2(TTFCO2)2 (1), trans-Re2(dppm)2Cl4(TTFCO2) (2), and cis-Re2Cl4(TTFCO2)2 (3), respectively. Depending on their respective solubility, the complexes were characterized via single crystal X-ray diffraction as well as electrochemical and spectroscopic properties.

Three dirhenium complexes are equatorially bridged by tetrathiafulvalene-monocarboxylate.Figure optionsDownload as PowerPoint slide