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

79 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

Fingerprint

Halogens
low molecular weights
halogens
Molecular weight
gratings
Irradiation
Light interference
Molecular orientation
Light polarization
Film thickness
Anisotropy
irradiation
Molecules
polarized light
film thickness
alignment
interference
anisotropy
molecules

Keywords

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

Cite this

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
Priimagi, A. ; Saccone, M. ; Cavallo, G. ; Shishido, A. ; Pilati, T. ; Metrangolo, Pierangelo ; Resnati, G. / Photoalignment and surface-relief-grating formation are efficiently combined in low-molecular-weight halogen-bonded complexes. In: Advanced Optical Materials. 2012 ; Vol. 24, No. 44. pp. OP345-OP352.
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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, vol. 24, no. 44, pp. OP345-OP352. https://doi.org/10.1002/adma.201204060

Photoalignment and surface-relief-grating formation are efficiently combined in low-molecular-weight halogen-bonded complexes. / Priimagi, A. (Corresponding Author); Saccone, M.; Cavallo, G.; Shishido, A. (Corresponding Author); Pilati, T.; Metrangolo, Pierangelo (Corresponding Author); Resnati, G. (Corresponding Author).

In: Advanced Optical Materials, Vol. 24, No. 44, 2012, p. OP345-OP352.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Photoalignment and surface-relief-grating formation are efficiently combined in low-molecular-weight halogen-bonded complexes

AU - Priimagi, A.

AU - Saccone, M.

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AU - Pilati, T.

AU - Metrangolo, Pierangelo

AU - Resnati, G.

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AB - 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.

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