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Light-Triggered, Non-Centrosymmetric Self-Assembly of Aqueous Arylazopyrazoles at the Air-Water Interface and Switching of Second-Harmonic Generation.
Nagai, Yuki; Ishiba, Keita; Yamamoto, Ryosuke; Yamada, Teppei; Morikawa, Masa-Aki; Kimizuka, Nobuo.
Affiliation
  • Nagai Y; Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka Nishi-ku, Fukuoka, 819-0395, Japan.
  • Ishiba K; Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka Nishi-ku, Fukuoka, 819-0395, Japan.
  • Yamamoto R; Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka Nishi-ku, Fukuoka, 819-0395, Japan.
  • Yamada T; Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka Nishi-ku, Fukuoka, 819-0395, Japan.
  • Morikawa MA; Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka Nishi-ku, Fukuoka, 819-0395, Japan.
  • Kimizuka N; Department of Chemistry, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.
Angew Chem Int Ed Engl ; 60(12): 6333-6338, 2021 Mar 15.
Article in En | MEDLINE | ID: mdl-33350044
ABSTRACT
Trans-p-methoxy arylazopyrazole spontaneously forms non-centrosymmetric polar crystals, which reversibly undergo liquefaction upon photoisomerization to the cis-isomer. This liquid cis-isomer has a large electric dipole moment and is highly soluble in water (solubility up to ≈58 mM), which is remarkably higher than that of the trans-isomer (690 µM). Vis-light illumination of the aqueous cis-isomer generates macroscopically oriented, non-centrosymmetric crystals at the air-water interface. Polar crystals are also formed in sandwich glass cells (spacing, 20 µm) upon photo-induced crystallization of the liquid cis-isomer. The trans-crystals thus formed showed second harmonic generation (SHG) whose intensity is switched on/off in response to the photo-induced phase transition.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Angew Chem Int Ed Engl Year: 2021 Document type: Article Affiliation country: Japan
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Angew Chem Int Ed Engl Year: 2021 Document type: Article Affiliation country: Japan