Photoalignment and surface-relief-grating formation are efficiently combined in low-molecular-weight halogen-bonded complexes

A. Priimagi (Corresponding Author), M. Saccone, G. Cavallo, A. Shishido (Corresponding Author), T. Pilati, Pierangelo Metrangolo (Corresponding Author), G. Resnati (Corresponding Author)

    Research output: Contribution to journalArticleScientificpeer-review

    89 Citations (Scopus)

    Abstract

    It is demonstrated that halogen bonding can be used to construct low‐molecular‐weight supramolecular complexes with unique light‐responsive properties. In particular, halogen bonding drives the formation of a photoresponsive liquid‐crystalline complex between a non‐mesogenic halogen bond‐donor molecule incorporating an azo group, and a non‐mesogenic alkoxystilbazole moiety, acting as a halogen bond‐acceptor. Upon irradiation with polarized light, the complex exhibits a high degree of photoinduced anisotropy (order parameter of molecular alignment > 0.5). Moreover, efficient photoinduced surface‐relief‐grating (SRG) formation occurs upon irradiation with a light interference pattern, with a surface‐modulation depth 2.4 times the initial film thickness. This is the first report on a halogen‐bonded photoresponsive low‐molecular‐weight complex, which furthermore combines a high degree of photoalignment and extremely efficient SRG formation in a unique way. This study highlights the potential of halogen bonding as a new tool for the rational design of high‐performance photoresponsive suprastructures.
    Original languageEnglish
    Pages (from-to)OP345-OP352
    Number of pages7
    JournalAdvanced Optical Materials
    Volume24
    Issue number44
    DOIs
    Publication statusPublished - 2012
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Azobenzene
    • halogen bonding
    • liquid crystals
    • self-assembly
    • supramolecular complexes

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