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Intramolecular energy transfer in ruthenium(II)-chromium(III) chromophore-luminophore complexes. Ru(bpy) sub 2 (Cr(cyclam)(CN) sub 2 ) sub 2 sup 4+

Journal Article · · Inorganic Chemistry; (United States)
DOI:https://doi.org/10.1021/ic00028a009· OSTI ID:7058911
A new trinuclear Ru(II)-Cr(III) chromophore-luminophore complex, Ru(bpy){sub 2}(Cr(cyclam)(CN){sub 2}){sub 2}{sup 4+}, has been synthesized and characterized. Visible light absorption by the Ru(bpy){sub 2}{sup 2+} chromophore leads to emission from the Cr(cyclam)(CN){sub 2}{sup +} luminophore, as a consequence of very efficient ({ge} 99%) and fast (subnanosecond time scale) chromophore-luminophore exchange energy-transfer process. The emission is intense ({Phi} = 5.3 {times} 10{sup {minus}3} in H{sub 2}O) and long-lived ({tau} = 260 {mu}s in H{sub 2}O). The photophysical properties of the luminophore are slightly perturbed by interaction with the chromophore, resulting in a sharper emission band shape and shorter radiative and radiationless lifetimes. The presence of a Ru(II) {yields} Cr(III) intervalence transfer state, hardly detectable in the ground-state spectrum, is clearly revealed by the excited-state absorption spectrum of the chromophore-luminophore complex.
OSTI ID:
7058911
Journal Information:
Inorganic Chemistry; (United States), Journal Name: Inorganic Chemistry; (United States) Vol. 31:2; ISSN 0020-1669; ISSN INOCA
Country of Publication:
United States
Language:
English

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