Photophysics of bis-bipyridyl complexes of ruthenium(II) with triphenylphosphine |
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Authors: | S V Litke A Yu Ershov |
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Institution: | (1) Department of Chemistry, Irkutsk State University, Irkutsk, 664003, Russia |
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Abstract: | We studied the spectral-luminescent characteristics of the luminescence of mixed-ligand polypyridine-phosphine complexes of
ruthenium(II) cis-Ru(bpy)2(PPh3)X](BF4)
n
with ligands 2,2′-bipyridyl (bpy) and triphenylphosphine (PPh3) and X = Cl−, Br−, CN−, NO2−, NH3, MeCN, pyridine (py), 4-aminopyridine (pyNH2), and 4,4′-bipyridyl (4,4′-bpy) in a 4: 1 EtOH-MeOH alcoholic mixture at 77 K. The radiative and nonradiative deactivation
rate constants of the lowest electronically excited state of the complexes are determined. We find that triphenylphosphine
has a greater effect on the photophysical characteristics of ruthenium(II) complexes compared to π-acceptor strong-field ligands,
such as MeCN, CN−, and NO2−. At the same time, the characteristics of complexes cis-Ru(bpy)2(PPh3)X]
n+ considerably depend on the nature of the second monodentate ligand X, which is coordinated to ruthenium(II), and correlate
with its position in the spectrochemical series of ligands. |
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Keywords: | |
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