Journal article

Photophysical and redox properties of dinuclear ru and os polypyridyl complexes with incorporated photostable spiropyran bridge

  • Jukes, Ron T. F. Van't Hoff Institute for Molecular Sciences, University of Amsterdam, The Netherlands
  • Bozic, Biljana Institute of Inorganic Chemistry, University of Fribourg, Switzerland
  • Belser, Peter Institute of Inorganic Chemistry, University of Fribourg, Switzerland
  • Cola, Luisa De Physikalisches Institut, Westfälische Wilhelms-Universität, Münster, Germany -
  • Hartl, František Van't Hoff Institute for Molecular Sciences, University of Amsterdam, The Netherlands
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    16.01.2009
Published in:
  • Inorganic Chemistry. - 2009, vol. 48, no. 4, p. 1711–1721
English Aimed at creating a true photoswitchable energy transfer system, four dinuclear complexes containing ruthenium(II) and osmium(II) metal centers bridged by spiropyran-type linkers were designed and investigated. The bridge in its closed spiropyran form was shown to be a good insulator for energy transfer between the Ru-bpy donor and the Os-bpy acceptor (bpy = 2,2′-bipyridine). On the basis of properties of previously reported photochromic nitrospiropyrans substituted with a single polypyridine metal center, conversion of the bridge to the open merocyanine form was envisaged to result in efficient electronic energy transfer by a sequential (“hopping”) mechanism. In contrast to the expectations, however, the studied closed-form dinuclear complexes remained stable independently of their photochemical or electrochemical activation. This difference in reactivity is attributed to the replacement of the nitro group by a second polypyridine metal center. We assume that these changes have fundamentally altered the excited-state and redox properties of the complexes, making the ring-opening pathways unavailable.
Faculty
Faculté des sciences et de médecine
Department
Département de Chimie
Language
  • English
Classification
Chemistry
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/301164
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