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Experimental Evidence of Ultrafast Quenching of the 3MLCT Luminescence in Ruthenium(II) Tris-bipyridyl Complexes via a 3dd State

Published inJournal of the American Chemical Society, vol. 135, no. 37, p. 13660-13663
Publication date2013
Abstract

Ultrafast transient absorption spectroscopy serves to identify the 3dd state as intermediate quencher state of the 3MLCT luminescence in the non-luminescent ruthenium complexes [Ru(m-bpy)3]2+ (m-bpy = 6-methyl-2,2′-bipyridine) and [Ru(tm-bpy)3]2+ (tm-bpy = 4,4′,6,6′-tetramethyl-2′,2′-bipyridine). For [Ru(m-bpy)3]2+, the population of the 3dd state from the 3MLCT state occurs within 1.6 ps, while the return to the ground state takes 450 ps. For [Ru(tm-bpy)3]2+, the corresponding values are 0.16 and 7.5 ps, respectively. According to DFT calculations, methyl groups added in the 6 and 6′ positions of bipyridine stabilize the 3dd state by ∼4000 cm–1 each, compared to [Ru(bpy)3]2+.

Citation (ISO format)
SUN, Qinchao et al. Experimental Evidence of Ultrafast Quenching of the <sup>3</sup>MLCT Luminescence in Ruthenium(II) Tris-bipyridyl Complexes via a <sup>3</sup>dd State. In: Journal of the American Chemical Society, 2013, vol. 135, n° 37, p. 13660–13663. doi: 10.1021/ja407225t
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