TY - JOUR
T1 - UV resonance raman and UV-VIS absorption spectra of aqueous solutions of an azobenzene-containing ammonium amphiphile
AU - Isono, Nobuaki
AU - Umemura, Junzo
AU - Takenaka, Tohru
AU - Shimomura, Masatsugu
AU - Kunitake, Toyoki
N1 - Funding Information:
This research was partly supported by a Grant-in-Aid on Special Project Research for "Organic Thin Films for Information Conversion" from the Ministry of Education, Science and Culture, Japan, for which the authors are grateful.
PY - 1987/6
Y1 - 1987/6
N2 - 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.
AB - 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.
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U2 - 10.1016/0021-9797(87)90399-7
DO - 10.1016/0021-9797(87)90399-7
M3 - Article
AN - SCOPUS:0023364086
SN - 0021-9797
VL - 117
SP - 400
EP - 405
JO - Journal of Colloid And Interface Science
JF - Journal of Colloid And Interface Science
IS - 2
ER -