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

82 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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    Priimagi, A., Saccone, M., Cavallo, G., Shishido, A., Pilati, T., Metrangolo, P., & Resnati, G. (2012). Photoalignment and surface-relief-grating formation are efficiently combined in low-molecular-weight halogen-bonded complexes. Advanced Optical Materials, 24(44), OP345-OP352. https://doi.org/10.1002/adma.201204060