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
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- English
- Classification
- Chemistry
- License
- License undefined
- Identifiers
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- RERO DOC 12224
- DOI 10.1021/ic800963u
- Persistent URL
- https://folia.unifr.ch/unifr/documents/301164
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