Photoalignment and Surface-Relief-Grating Formation are Efficiently Combined in Low-Molecular-Weight Halogen-Bonded Complexes

ARRI PRIIMAGI, MARCO SACCONE, GABRIELLA CAVALLO, A. Shishido, TULLIO MARIA PILATI, PIERANGELO METRANGOLO, GIUSEPPE RESNATI

Risultato della ricerca: Contributo su rivistaArticolo in rivista

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.
Lingua originaleInglese
pagine (da-a)OP345-OP352
Numero di pagine8
RivistaAdvanced Materials
Volume24
DOI
Stato di pubblicazionePubblicato - 2012

Keywords

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

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