A series of cyanide-bridged bimetallic compounds of the general formula [Ru(L)(bpy)(μ-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 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 met for avoiding the reductive or oxidative quenching of the excited state are also discussed.
一系列通式为[Ru(L)(bpy)(μ-NC)(M)]2-/-2+(L = tpy,2,2′-6′,2′′-三
吡啶,或 tpm、M=RuII(CN)5、OsIII(CN)5、OsII(CN)5、RuII(py)4(CN),py=
吡啶)进行了合成和全面表征。它们大多具有 MLCT 发射(λ = 690-730 纳米,Φ = 10-3-10-4),其光物理性质与相应的单核 Ru(L)(bpy) 物种相似。但当 M 为 OsIII(CN)5 时例外,有人提出了分子内电子转移淬灭机制。此外,还讨论了避免激发态还原或氧化淬灭应满足的条件。