Influence of temperature and ethanol content on aggregation of rhodamine 6G molecules in aqueous ethanol solutions |
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| Authors: | D V Ageev S V Patsaeva B D Ryzhikov V N Sorokin V I Yuzhakov |
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| Institution: | (1) M. V. Lomonosov Moscow State University, Vorob’evi Gori, 119991 Moscow, Russia;(2) OOO NPO Oval, Moscow, Russia |
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| Abstract: | The effect of temperature on absorption spectra of Rhodamine 6G at concentrations of 10−6 and 10−3 M in water:ethanol solutions of various ethanol content was studied. The dimeric molecular fraction of Rhodamine 6G (10−3 M) was found as a function of temperature and ethanol content in the aqueous solution. It was shown that the absorption spectrum
of Rhodamine 6G dimers (10−3 M) is dependent on temperature and ethanol content in the aqueous solution. Based on the relationship between J-and H-bands
in the absorption spectrum of Rhodamine 6G dimers, both the angle between planes of associated Rhodamine 6G dye molecules
and the free enthalpy of association were calculated. The structure of Rhodamine 6G dimers depends essentially on the ethanol
content and aqueous ethanol solution temperature while experiencing the most temperature changes at an ethanol concentration
of 25%.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 75, No. 5, pp. 640–645, September–October, 2008. |
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| Keywords: | absorption luminescence aggregation of dye molecules dimers angle between associated molecules enthalpy of association aqueous ethanol solution |
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