Syntheses, characterization, and properties of Ru(II) complexes based on pi-conjugated terpyridine ligand with tetrathiafulvalene moiety.

Two ruthenium(II) complexes [Ru(TTF-terpy)(terpy)][PF(6)](2) (terpy = 2,2':6',2''-terpyridine) (1) and [Ru(TTF-terpy)(2)][PF6](2) (2) were synthesized by reactions of Ru(terpy)(dmso)(2)Cl(2) or cis-Ru(dmso)(4)Cl(2) with 4'-tetrathiafulvalene-2,2':6',2''-terpyridine (TTF-terpy), respectively. The crystal structure of 1 has been determined by X-ray crystallography. In the crystal of complex 1, molecules are seized together into 1D chains via pi···pi stacking interactions. The electrochemical and spectroscopic properties of these compounds have been studied. The results show that these Ru(II) complexes show stepwise redox processes in solution, and are promising building blocks for the construction of multi-functional materials.