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Photo-switching of non-ionic azobenzene amphiphile in Langmuir and Langmuir-Blodgett films

Abstract

The concept of a programmable and reconfigurable soft matter has emerged in science in the last decades and can be realized by a photoisomerization of azobenzene derivatives. This possibility results in a great application potential of these compounds in optical storage devices, Molecular junctions of electronic devices, command layers of liquid crystal displays or holographic gratings. In this paper, we present results of a study on organization and isomerization of the non-ionic and amphiphilic methyl 4-[(E)-2-[4-(nonyloxy)phenyl]diazen-1-yl]benzoate (LCA) in a 2D layer architecture of Langmuir and Langmuir-Blodgett (LB) films supported by spectroscopic studies on LCA chloroform solutions. Our investigation has shown significantly different molecular organization o LCA depending on the ratio of trans and cis isomers in monolayers. Taking advantage of a relatively low packing density and aggregation strength in the cis-LCA monolayer, we demonstrated the reversible isomerization in the LB film initially formed of LCA molecules in the cis form, while in the trans-LCA monolayer this effect was not observed. Our approach allows the formation of a switchable monolayer made of the amphiphilic LCA showing liquid crystalline properties without introducing of an ionic group into the molecule structure, mixing with another compound or changing subphase pH to provide free space for the molecules isomerization.

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Publication details

The article was received on 24 May 2017, accepted on 10 Aug 2017 and first published on 10 Aug 2017


Article type: Paper
DOI: 10.1039/C7CP03514D
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Photo-switching of non-ionic azobenzene amphiphile in Langmuir and Langmuir-Blodgett films

    E. Piosik, M. Kotkowiak, I. Korbecka, Z. Galewski and T. Martynski, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP03514D

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