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Issue 13, 2012
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Kinetic analysis of the thermal isomerisation pathways in an asymmetric double azobenzene switch

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Abstract

Here we report a photochemical and kinetic study of the thermal relaxation reaction of a double azobenzene system, in which two azobenzene photochromic units are connected via a phenyl ring. Upon UV irradiation, three thermally unstable isomers are formed. Kinetic studies using arrayed 1H-NMR spectroscopy revealed four distinct barriers for the thermal reversion to the stable isomer. The double isomerised Z,Z-2 can revert thermally to the E,E-2 isomer via either of two isomerisation pathways. The thermal Z to E isomerisations are not significantly affected by the state of the neighbouring azo-switching unit in the meta position. These findings are supported by quantum chemical calculations on the thermal Z to E isomerisation.

Graphical abstract: Kinetic analysis of the thermal isomerisation pathways in an asymmetric double azobenzene switch

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Publication details

The article was received on 27 Nov 2011, accepted on 23 Jan 2012 and first published on 24 Jan 2012


Article type: Paper
DOI: 10.1039/C2CP23756C
Citation: Phys. Chem. Chem. Phys., 2012,14, 4374-4382

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    Kinetic analysis of the thermal isomerisation pathways in an asymmetric double azobenzene switch

    J. Robertus, S. F. Reker, T. C. Pijper, A. Deuzeman, W. R. Browne and B. L. Feringa, Phys. Chem. Chem. Phys., 2012, 14, 4374
    DOI: 10.1039/C2CP23756C

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