Emissive Cyanide-Bridged Bimetallic Compounds as Building Blocks for Polymeric Antennae

ALEJANDRO CADRANEL; BRUNO M. ARAMBURU TROSELJ; SHIORI YAMAZAKI; PABLO ALBORÉS; VALERIA D. KLEIMAN; LUIS M. BARALDO

DALTON TRANSACTIONS

ROYAL SOC CHEMISTRY

Lugar: Cambridge; Año: 2013 vol. 42 p. 16723 - 16732

1477-9226

A series of cyanide-bridged bimetallic compounds of the general formula [Ru(L)(bpy)(>-NC)(M)]2-/-/2+ (L = tpy, 2,2?-6?,2??-terpyridine, or tpm, tris(1-pyrazolyl)methane, bpy =2,2?-bipyridine, M = RuII(CN)5, OsIII(CN)5, OsII(CN)5, RuII(py)4(CN), py = pyridine) have been synthesized and fully characterized. Most of them present a MLCT emission (λ = 690- 730 nm, Φ = 10-3-10-4) and their photophysical properties resemble the ones of the respective mononuclear Ru(L)(bpy) species. The exception is when M is OsIII(CN)5, where an intramolecular electron transfer quenching mechanism is proposed. The conditions that should be meet for avoiding the reductive or oxidative quenching of the excited state are also discussed.