Synthesis, electrochemistry, and photophysical properties of binuclear ruthenium(II)–terpyridine complexes comprising redox-active ferrocenyl spacer

In attempting to perturb the electronic properties of the spacer, we now describe an interesting example of Ru2+–terpyridine complexes with 1,1′-bis(ethynyl)ferrocenes moiety attached directly to the 4′-position of terpyridine ligand which have room-temperature luminescence in H2O/CH3CN (4/1) solution.