Acidity effects on the fluorescence properties and adsorptive behavior of rhodamine 6G molecules at the air-water interface studied with confocal fluorescence microscopy

Xue Ying Zheng, Mika Wachi, Akira Harata, Yoshihiko Hatano

    Research output: Contribution to journalArticle

    14 Citations (Scopus)

    Abstract

    The effects of acidity on fluorescence originated from rhodamine 6G (R6G) molecules adsorbed at the air-water interface of extremely low-concentration aqueous solutions have been studied with confocal fluorescence microscopy. Similarities and differences in the observed acidity effects between R6G molecules at the interface and those in the bulk solution have been discussed. With increasing the subphase-pH from 1 to 6, height and frequency of photon bursts as well as intensity of the interface-originated fluorescence change in two steps, while bulk fluorescence changes in one step and a little change in the number of adsorbed R6G molecules is verified with surface tension measurements. The results suggest that there is an interface-specific equilibrium among the chemical forms of R6G molecules. Chemical forms contributing to the interface-originated fluorescence above pH 5 are discussed.

    Original languageEnglish
    Pages (from-to)1085-1090
    Number of pages6
    JournalSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
    Volume60
    Issue number5
    DOIs
    Publication statusPublished - Apr 2004

    All Science Journal Classification (ASJC) codes

    • Analytical Chemistry
    • Atomic and Molecular Physics, and Optics
    • Instrumentation
    • Spectroscopy

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