Photoinduced switching of nanocomposites consisting of azobenzene and molecular 
sieves: investigation of the switching states

Hoffmann, K.; Resch-Genger, U.; Marlow, F.

doi:10.1016/S1387-1811(00)00277-8

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Photoinduced switching of nanocomposites consisting of azobenzene and molecular sieves: investigation of the switching states

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Marlow, F.
Research Group Marlow, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Hoffmann, K., Resch-Genger, U., & Marlow, F. (2000). Photoinduced switching of nanocomposites consisting of azobenzene and molecular sieves: investigation of the switching states. Microporous and Mesoporous Materials, 41(1-3), 99-106. doi:10.1016/S1387-1811(00)00277-8.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0024-2894-C

Abstract

Cis–trans photoisomerization of azobenzene in the molecular sieve hosts AlPO₄-5 and ZSM-5 causes large and reversible changes of the refractive index of the composite systems. This process strongly depends on both the irradiation wavelength and the molecular sieve host. The rate constant of the thermal relaxation of the cis-state composites increases from 2.0x10^-6 s^-l in AlPO₄-5 to 3.1x10^-5 s^-l in ZSM-5. Both switching states are stable over hours or days. The reversibility of the switching process exceeds several hundred switching cycles indicating that the cis–trans photoisomerization proceeds without significant side reactions in both matrices.