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Issue 7, 2016
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A calamitic mesogenic near-infrared absorbing croconaine dye/liquid crystalline elastomer composite

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Abstract

In this work, we report the first example of a calamitic mesogenic near-infrared (NIR) absorbing organic dye, made by functionalizing a thiophene–croconaine chromophore rigid core with two symmetric long flexible alkyl chains. The liquid crystal (LC) NIR dye YHD796 exhibits a sharp and intense NIR absorption band with a maximum absorption peak at 796 nm. Taking advantage of the improved solubility of YHD796 dispersed in mesogenic molecules, a homogeneously-aligned mono-domain liquid crystalline elastomer (LCE)/YHD796 composite film is successfully prepared by applying the classical LC-cell-alignment method and in situ photo-polymerization of photocurable LC monomer mixtures. This LCE/YHD796 composite film performs a fully reversible contraction/expansion response towards NIR light stimulus due to the photo-thermal heating effect induced by the YHD796 dye well-dispersed in the LCE matrix.

Graphical abstract: A calamitic mesogenic near-infrared absorbing croconaine dye/liquid crystalline elastomer composite

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Publication details

The article was received on 18 Feb 2016, accepted on 24 Mar 2016 and first published on 29 Mar 2016


Article type: Edge Article
DOI: 10.1039/C6SC00758A
Citation: Chem. Sci., 2016,7, 4400-4406
  • Open access: Creative Commons BY-NC license
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    A calamitic mesogenic near-infrared absorbing croconaine dye/liquid crystalline elastomer composite

    L. Guo, M. Liu, S. M. Sayed, B. Lin, P. Keller, X. Zhang, Y. Sun and H. Yang, Chem. Sci., 2016, 7, 4400
    DOI: 10.1039/C6SC00758A

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