UV resonance raman and UV-VIS absorption spectra of aqueous solutions of an azobenzene-containing ammonium amphiphile

Nobuaki Isono, Junzo Umemura, Tohru Takenaka, Masatsugu Shimomura, Toyoki Kunitake

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)

    Abstract

    UV resonance Raman and UV-VIS absorption spectra of aqueous solutions of an azobenzene-containing, single-chain amphiphile have been measured over wide ranges of temperature and concentration. Below the gel- or coagel-liquid crystalline phase transition temperature (Tc), the aqueous solution gives a doublet absorption band at 375 and 393 nm due to aJ-like bilayer aggregate. AboveTc, on the other hand, it shows a single broad band at 345 nm suggesting the liquid crystalline state. With a further increase in temperature, the absorption band shifts to 355 nm, indicating that a molecularly dispersed state is attained. The intensity ratios of the two intense Raman bands at 1458 and 1413 cm-1 of the aqueous solution are found to change upon the melting of ice surrounding the amphiphile. With dilution of the aqueous solution below and aboveTc, spectral changes due to the gel-molecularly dispersed state transition and the liquid crystalline-molecularly dispersed state transition are observed at 2 x 10-5 and 4 x 10-5M, respectively.

    Original languageEnglish
    Pages (from-to)400-405
    Number of pages6
    JournalJournal of Colloid And Interface Science
    Volume117
    Issue number2
    DOIs
    Publication statusPublished - 1987 Jun

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Biomaterials
    • Surfaces, Coatings and Films
    • Colloid and Surface Chemistry

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