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Ultrafast Dynamics of the Low-Lying 3MLCT States of [Ru(bpy)2(dppp2)]2+

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    Ultrafast Dynamics of the Low-Lying 3MLCT States of [Ru(bpy)2(dppp2)]2+
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    Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
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    Journal of the American Chemical Society

    Cite this: J. Am. Chem. Soc. 2010, 132, 16, 5594–5595
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    https://doi.org/10.1021/ja101703w
    Published April 5, 2010
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    Abstract

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    The solvent dependence of the excited state dynamics of [Ru(bpy)2(dppp2)]2+ (bpy = 2,2′-bipyridine, dppp2 = pyrido[2′,3′:5,6]pyrazino[2,3-f][1,10]phenanthroline) were investigated using ultrafast transient absorption spectroscopy. In contrast to the “DNA light-switch” complex [Ru(bpy)2(dppz)]2+ (dppz = dipyrido[3,2-a:2′,3′-c]phenzine), the structurally related [Ru(bpy)2(dppp2)]2+ exhibits discrete formation of the lowest-lying 3MLCTdis (MLCT = metal-to-ligand charge transfer) state from the higher-energy 3MLCTprox state in the picosecond time scale. In 3MLCTdis and 3MLCTprox, the transferred electron is localized on the portion of the dppp2 ligand distal and proximal to the metal, respectively. The greater dipole moment of 3MLCTdis compared to 3MCLTprox, together with the ability of the dppp2 ligand to hydrogen bond, results in a strong dependence of the kinetics of the interconversion process on solvent polarity, decreasing from 67 to 26 ps in CH2Cl2 and CH3CN, respectively. Similarly, the lifetime of the emission of the lowest energy state of [Ru(bpy)2(dppp2)]2+ also decreases from 273 to 35 ns in the same solvents. In CH3CH2OH, both the rate of interconversion and the decay of 3MLCTdis are significantly faster, 6.7 ps and 1.7 ns, respectively. Such dependence of the excited state properties is not observed for [Ru(bpy)2(dppz)]2+. The results are consistent with the relative stabilization of 3MLCTdis of the dppp2 complex in CH3CN compared to CH2Cl2 due to solvent polarity, which may be further stabilized by hydrogen bonding in CH3CH2OH.

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    Ultrafast spectra of 1 and 2. This material is available free of charge via the Internet at http://pubs.acs.org.

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    Cite this: J. Am. Chem. Soc. 2010, 132, 16, 5594–5595
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