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A new strategy for the improvement of photophysical properties in ruthenium(II) polypyridyl complexes. Synthesis and photophysical and electrochemical characterization of six mononuclear ruthenium(II) bisterpyridine-type complexes
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2005 (English)In: Inorganic Chemistry, ISSN 0020-1669, E-ISSN 1520-510X, Vol. 44, no 9, 3215-3225 p.Article in journal (Refereed) Published
Abstract [en]

The synthesis and characterization of six ruthenium(II) bistridentate polypyridyl complexes is described. These were designed on the basis of a new approach to increase the excited-state lifetime of ruthenium(II) bisterpyridine-type complexes. By the use of a bipyridylpyridyl methane ligand in place of terpyridine, the coordination environment of the metal ion becomes nearly octahedral and the rate of deactivation via ligand-field (i.e., metal-centered) states was reduced as shown by temperature-dependent emission lifetime studies. Still, the possibility to make quasi-linear donor-ruthenium-acceptor triads is maintained in the complexes. The most promising complex shows an excited-state lifet me of tau = 15 ns in alcohol solutions at room temperature, which should be compared to a lifetime of tau = 0.25 ns for [Ru(tpy)(2)](2+). The X-ray structure of the new complex indeed shows a more octahedral geometry than that of [Ru(tpy)(2)](2+). Most importantly, the high excited-state energy was retained, and thus, so was the potential high reactivity of the excited complex, which has not been the case with previously published strategies based on bistridentate complexes.

Place, publisher, year, edition, pages
2005. Vol. 44, no 9, 3215-3225 p.
Keyword [en]
transfer excited-states, molecular-mechanics, artificial photosynthesis, luminescence lifetimes, terpyridine complexes, tridentate ligands, ru(ii) complexes, electron-donor, photochemistry, absorption
URN: urn:nbn:se:kth:diva-14716DOI: 10.1021/ic048247aISI: 000228813400036ScopusID: 2-s2.0-19944395203OAI: diva2:332757
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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