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Title

Light-Induced Bistability in the 2D Coordination Network {[Fe(bbtr)3[BF4]2} : Wavelength-Selective Addressing of Molecular Spin States

Authors
Pillet, Sebastien
Bendeif, El-Eulmi
Bronisz, Robert
Published in Chemistry - A European Journal. 2013, vol. 19, no. 34, p. 11418-11428
Abstract Whereas the neat polymeric Fe(II) compound {[Fe(bbtr)3](ClO4)2}∞ (bbtr=1,4-di(1,2,3-triazol-1-yl)butane) shows an abrupt spin transition centered at 107 K facilitated by a crystallographic symmetry breaking, in the covalently linked 2D coordination network of {[Fe(bbtr)3](BF4)2}∞, Fe(II) stays in the high-spin state down to 10 K. However, strong cooperative effects of elastic origin result in reversible, persistent and wavelength-selective photoswitching between the low-spin and high-spin manifolds. This compound thus shows true light-induced bistability below 100 K. The persistent bidirectional optical switching behavior is discussed as a function of temperature, irradiation time and intensity. Crystallographic studies reveal a photo-induced symmetry breaking and serve to establish the correlation between structure and cooperative effects. The static and kinetic behavior is explicated within the framework of the mean-field approximation.
Keywords Cooperative effectsIronPhotoinduced bistabilityPhotoswitchingSpin crossover
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Other version: http://doi.wiley.com/10.1002/chem.201301257
Structures
Research group Groupe Hauser
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CHAKRABORTY, Pradip et al. Light-Induced Bistability in the 2D Coordination Network {[Fe(bbtr)3[BF4]2} : Wavelength-Selective Addressing of Molecular Spin States. In: Chemistry - A European Journal, 2013, vol. 19, n° 34, p. 11418-11428. https://archive-ouverte.unige.ch/unige:29524

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Deposited on : 2013-09-02

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