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Metal-Ligand Complexes
Ru-, Os- and Re- metal-ligand-comlexes (MLCs) have been well-investigated as fluorescent probes and labels for many different applications. MLCs combine long luminescent lifetimes in the order of tens of ns to microseconds, adequate extinction coefficients and quantum yields in the order of 5 – 40%. Ru-MLCs were identified as luminescent probes to measure rotational motions of proteins [1-3]. It was demonstrated that specific, asymmetric complexes of Ru, Os and Re display high anisotropy in absence of rotational motion. Some of these complexes are also used as fluorescent intercalators for DNA or as FRET donors [4].
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