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The synthesis and photophysical properties of a novel ruthenium-modified nucleoside are reported. The key synthetic step to 5-[Ru(bpy) 2 (4-m-4‘-pa-bpy)] 2+ -2‘-deoxyuridine involves the Pd(0)-catalyzed cross-coupling of a propargylamine-derivatized Ru(bpy) 3 2+ and 3‘,5‘-dibenzoyloxy-2‘-deoxy-5-iodouridine. The long-lived 3 MLCT excited state (1300 ns) of 5-[Ru(bpy) 2 (4-m-4‘-pa-bpy)] 2+ -2‘-deoxyuridine has an emission maximum centered at 640 nm. Step-scan Fourier transform infrared (S 2 FTIR) time-resolved spectroscopy reveals the excited-state electron to be localized on the modified bipyridine with the excited-state dipole oriented toward the 2‘-deoxyuridine.
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Khan et al. (1999) studied this question.
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