Structural phase transition of J-aggregate crystallites on the binary counter-ion subphase

Noritaka Kato, Takeshi Araki, Yoshiaki Uesu, Masugu Sato, Ichiro Hirosawa, Naoshi Ikeda, Ken Ichi Iimura

Research output: Contribution to journalArticlepeer-review


The recently found chromic phase transition of merocyanine J-aggregates monolayer on the aqueous subphase containing Cd2+ and Mg2+ was investigated by the grazing-incidence X-ray diffraction method. The evidence of the structural difference between the phases of J-band at 620 nm and 590 nm was obtained by the investigations on the monolayers prepared at the different molar ratios of Cd2+ and Mg2+. The change in a Bragg's peak was observed at the ratio of the ions, where the J-band wavelength also exhibited the discrete shift. The relationship between the obtained results and the phase diagram determined by the shift of the J-band wavelength was also discussed from the viewpoint of the formation mechanism of J-aggregate crystallites.

Original languageEnglish
Pages (from-to)135-141
Number of pages7
Publication statusPublished - 2005
Externally publishedYes


  • Grazing-incidence
  • J-aggregate
  • Monolayer
  • Phase transition
  • X-ray diffraction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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