Relaxation dynamics of a photoinduced di-cobalt-tetraoxolene valence tautomer

The relaxation kinetics of the photoinduced metastable state of a dinuclear Co-tetraoxolene complex are reported and discussed. The analysis of the temperature dependence reveals that at low temperature a phonon assisted tunnelling process dominates, while a thermally activated one is responsible fo...

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Bibliographic Details
Published in:Inorganica Chimica Acta 2007-10, Vol.360 (13), p.3825-3828
Main Authors: Carbonera, Chiara, Dei, Andrea, Létard, Jean-François, Sangregorio, Claudio, Sorace, Lorenzo
Format: Article
Language:English
Subjects:
Chemical Sciences
Material chemistry
Photochromism
Photomagnetism
Radical ligand
Redox isomerism
Semiquinone
Valence tautomerism
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Summary:The relaxation kinetics of the photoinduced metastable state of a dinuclear Co-tetraoxolene complex are reported and discussed. The analysis of the temperature dependence reveals that at low temperature a phonon assisted tunnelling process dominates, while a thermally activated one is responsible for the relaxation at higher temperatures. The temperature dependence of the relaxation dynamics of a dinuclear cobalt-tetraoxolene complex undergoing photoinduced valence tautomerism is reported and discussed. Two different regimes were detected, one at low (5–20 K) and a second at higher temperatures (20–35 K). The activation energy for the low temperature regime suggests a tunnelling process assisted by lattice phonons. In the thermally activated region the activation energy is far from that expected for the total-symmetric Co–O breathing mode, thus suggesting an important role for other internal vibrational modes.
ISSN:0020-1693
1873-3255
0020-1693
DOI:10.1016/j.ica.2007.01.020