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Photochromism of Amphiphilic Dithienylethenes as Langmuir–Schaefer Films

MPS-Authors
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Rossos,  A.
Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Katsiaflaka,  Maria
Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
The Hamburg Center for Ultrafast Imaging, University of Hamburg;

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König,  E.
Ultrafast Electronics, Scientific Service Units, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Bücker,  R.
Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Keskin,  S.
Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Kassier,  G.
Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Gengler,  Régis Y. N.
Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Miller,  R. J. D.
Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
The Hamburg Center for Ultrafast Imaging, University of Hamburg;
Departments of Chemistry and Physics, University of Toronto;

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Citation

Rossos, A., Katsiaflaka, M., Cai, J., Myers, S. M., König, E., Bücker, R., et al. (2018). Photochromism of Amphiphilic Dithienylethenes as Langmuir–Schaefer Films. Langmuir, 34(37), 10905-10912. doi:10.1021/acs.langmuir.8b02484.


Cite as: http://hdl.handle.net/21.11116/0000-0002-45A6-5
Abstract
Surface pressure–area isotherms were recorded under different irradiation conditions for single-component Langmuir films of three photochromic amphiphilic dithienylethenes. Nonirradiated films of these photochromic amphiphiles were mechanically stable. In addition, a shift of the isotherms to larger mean molecular areas was observed for films prepared from UV-light-irradiated dithienylethenes. Unexpectedly, a significant expansion was observed for a film prepared from visible-light-irradiated dithienylethene incorporating large branched alkyl chains. Upon further study, atomic force microscopy and transmission electron microscopy images of Langmuir–Schaefer films revealed that this pronged dialkyl derivative undergoes a photoinduced change in morphology, as circular aggregates coalesce into larger continuous aggregated structures. Nevertheless, its photoisomerization was completely reversible as single-component multilayer thin films upon direct UV or visible light irradiation.