The structural and photophysical properties of three new ReL(CO)3Cl complexes (ReL1–ReL3) and their 1‐(2‐pyridyl)imidazo[1,5‐a]pyridine ligands, namely 3‐methyl‐1‐(2‐pyridyl)imidazo[1,5‐a]pyridine (L1), 1‐(2‐pyridyl)‐3‐[4‐(trifluoromethyl)phenyl]imidazo[1,5‐a]pyridine (L2), and 3‐(4‐nitrophenyl)‐1‐(2‐pyridyl)imidazo[1,5‐a]pyridine (L3), were studied by spectroscopy, X‐ray diffraction, and computational methods. ReL1–ReL3 have high‐energy singlet emissions arising from a π → π* ligand‐centered state. In oxygen‐free acetonitrile solutions, the complexes display dual fluorescence due to intense ligand‐centered triplet emission.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
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Garino et al. (2008) studied this question.
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