Crystallographic coherent lengths of J-aggregates and their absorption spectra

Noritaka Kato*, Ichiro Hirosawa, Masugu Sato, Tomoyuki Koganezawa, Kazuya Yuasa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The Langmuir (L) and Langmuir-Blodgett (LB) films of the J-aggregates formed by amphiphilic merocyanine dye (MD) differ their absorption bands (J-bands), and the J-band in the LB film is located in shorter wavelength than that in the L film. From the grazing incidence X-ray diffraction patterns, the lattice structures and the crystallographic coherent lengths of the MD J-aggregates in the L and LB films were evaluated. Besides a 7% shrinkage of the 2-dimensional lattice in the LB film, more than two-order of magnitude shorter coherent lengths were observed in the LB film, suggesting that the difference of the J-band wavelength was attributed to the size effect of the J-aggregate crystal.

Original languageEnglish
Pages (from-to)275-280
Number of pages6
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Issue number1-3
Publication statusPublished - 2008 May 15


  • J-aggregate
  • Merocyanine
  • Size effect
  • X-ray diffraction

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry


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