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Synthesis and photochemistry of Ru(II) complexes containing phenanthroline-based ligands with fused pyrrole rings

Inorganic Chemistry, ISSN: 0020-1669, Vol: 41, Issue: 25, Page: 6688-6694
2002
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Hydrolysis of 1,10-phenanthrolinopyrrole ethyl ester leads to the acid derivative which is unstable at room-temperature releasing CO and forming 1,10-phenanthrolinopyrrole (php). The ligand reacts with ruthenium(II) to form a series of complexes of the general formula [Ru(php)(bpy)], where bpy = 2,2′-bipyridine and n = 1-3. The photochemical properties reveal that the complexes have longer-lived excited states than the standard complex, [Ru(bpy)]. Their emission lifetimes range from 9.04 μs (n = 1) to 35.5 μs (n = 3) at 77 K compared to 7.57 μs for the standard. Similarly, at room-temperature, emission lifetimes range from 1.20 μs (n = 1) to 1.70 μs (n = 3) relative to the standard (0.56 μs). The emission quantum yields also have higher values than the standard [Ru(bpy)] under similar conditions. The temperature-dependent studies for the complexes establish the distribution among the radiative, nonradiative, and MLCT to d-d decay channels and are in agreement with the energy gap law.

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