Imaging Science and Photochemistry ›› 1992, Vol. 10 ›› Issue (3): 207-212.DOI: 10.7517/j.issn.1674-0475.1992.03.207

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A STUDY OF FORMATION OF J-AGGREGATES IN MONOLA- YERS BY COSPREADING OF LIPID AND WATER- SOLUBLE CYANINE DYE

LI BAO-FANG1, DIETMAR MOBIUS2   

  1. 1. Institute of Photographic Chemistry, Academia Sinica, Beijing 100101, P. R. China;
    2. Max-Planck-lnstitut fur biophysicalische chemie, D-3400 Gottingen-Nikolausberg, Germany
  • Received:1990-12-20 Revised:1991-07-05 Online:1992-08-20 Published:1992-08-20

Abstract: Authors report on formation of J-aggregate monolayers of two cyanine dyes with the same chromophore, however, having a different net charge, after cospreading with the appropriate lipid. Authors had measured surface pressure/area, surface potential/area isotherms, reflection spectra and absorption spectra. It was found that the cationic dye in monolayers with arachidic acid showed a surface pressure dependent equilibrium between dimers and J-aggregate. The second cyanine dye with a net negative charge was spread with eicosylamine and formed the J-aggregate at very low surface pressures. The monolayers with dye B is optically anisotropic in the layer plane.

Key words: aggregate, monolayer, sur ace pressure surface potential, reflection, an-isotropic.