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  • 1.
    Nurkkala, Lasse
    et al.
    Mälardalen University, Department of Biology and Chemical Engineering.
    Steen, Robert
    Mälardalen University, Department of Biology and Chemical Engineering.
    Friberg, Henrik
    Mälardalen University, Department of Biology and Chemical Engineering.
    Häggström, Johanna
    Mälardalen University, Department of Biology and Chemical Engineering.
    Bernhardt, Paul
    Riley, Mark
    Dunne, Simon
    Mälardalen University, Department of Biology and Chemical Engineering.
    The effects of pendant vs. fused thiophene attachment upon the luminescence lifetimes and electrochemistry of tris(2,2 '-bipyridine)ruthenium(II) complexes2008In: European Journal of Inorganic Chemistry, ISSN 1434-1948, E-ISSN 1099-1948, no 26, p. 4101-4110Article in journal (Refereed)
    Abstract [en]

    The electrochemical and photophysical properties for a range of ruthenium(II) tris-2,2’-bipyridine complexes in which a thiophene substituent is attached to one of the bipyridine ligands via either a pendant or a fused mode have been determined. The fused mode of attachment eliminates torsional movement between the thiophene unit and the chelating bipyridine, thereby offering optimal overlap between the p systems of the chelating unit and the attached thiophene unit. The electrochemical properties of these complexes were found to be similar, however the luminescence lifetimes and intensities (in CH3CN at room temperature) were found to be correlated to the mode of attachment. The longest luminescence lifetime was

    observed for the complex [Ru(bpy)2(4-thiophen-2-yl-[2,2']-bipyridine)]2+ (3000 ns), as compared to the prototypic [Ru(bpy)3]2+ (1745 ns). This complex also had the highest quantum yield (0.045). In the four isomeric complexes where the thiophene ring was fused to the b or c face of the pyridine the lifetimes fell in the interval 275-1510 ns and the quantum yield ranged between 0.0047-0.014.

     

    (© WILEY-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)

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