A paddlewheel dinuclear Cu(II) compound coordinated with TTF-py redox ligand

A new paddlewheel dinuclear complex with a pyridyl-tetrathiafulvalene (TTF-py) ligand has been obtained and characterized crystallographically as [(DMT-TTF-py)2Cu2(OAc)4]·2C6H6 (1). Meanwhile a mononuclear compound [(DMT-TTF-py)2Cu(PhCOO)2(CH3OH)2]·2CH2Cl2 (2) was also isolated. UV–vis spectra and cyclic voltammogram of the paddlewheel complex were studied, showing that compound 1 can undergo an oxidization to form a stable cation of [(DMT-TTF-py)2Cu2(OAc)4]2+. By this strategy, compound 3, [(DMT-TTF-py)2Cu2(OAc)4](I3)2 as a radical salt, has been prepared and its conductivity of powder sample was 1.02 × 10−3 ohm−1 cm−1. Antiferromagnetic coupling of Cu(II)–Cu(II) was found from the results of ESR spectra, but the coupling between the radical–Cu(II) was very weak.