caa a22 4500 475764862 CHVBK 20180406123602.0 cr unu---uuuuu 170329e20000201xx s 000 0 eng 10.1007/s003960050024 doi (NATIONALLICENCE)springer-10.1007/s003960050024 Fourier transform-IR and 1H NMR studies on the structure of water solubilized by reverse aggregates of calcium bis(2-ethylhexyl) sulfosuccinate in organic solvents [Elektronische Daten] [L. P. Novaki, P. A. R. Pires, O.A. El Seoud] The structure of water solubilized by reverse aggregates of calcium bis(2-ethylhexyl) sulfosuccinate in deuterobenzene and toluene has been probed by Fourier transform-IR and 1H NMR spectroscopies. The νOD band of solubilized HOD (4% D2O in H2O) has been recorded as a function of the [water]/[surfactant] molar ratio, W/S. Curve fitting of this band showed the presence of a main peak at 2550 ± 13 cm−1 and a small one at 2405 ± 15 cm−1. As a function of increasing W/S, the frequency of the main peak decreases, its full width at half-height increases, and its area increases linearly. The 1H NMR chemical shift of solubilized H2O-D2O mixtures at W/S = 18.1 has been measured as a function of the deuterium content of the aqueous nanodroplet. These data were used to calculate the so-called "fractionation factor” of the aggregate-solubilized water, the value of which was found to be unity. The results of both techniques show that reverse aggregate-solubilized water, although different from bulk water, does not seem to coexist in "layers” of different degrees of structure, as suggested, for example by the two-state water-solubilization model. Springer-Verlag Berlin Heidelberg, 2000 Key words Reverse micelles nationallicence Microemulsions nationallicence Water-in-oil nationallicence Structure of interfacial water nationallicence Fourier transform nationallicence IR and 1H NMR spectroscopy of interfacial water nationallicence Novaki L. P. Instituto de Química Universidade de São Paulo C.P. 26.077, 05599-970 São Paulo, S.P., Brazil E-mail: elseoud@iq.usp.br Fax: +55-11-8183874, BR aut Pires P. A. R. Instituto de Química Universidade de São Paulo C.P. 26.077, 05599-970 São Paulo, S.P., Brazil E-mail: elseoud@iq.usp.br Fax: +55-11-8183874, BR aut Seoud O.A. El Instituto de Química Universidade de São Paulo C.P. 26.077, 05599-970 São Paulo, S.P., Brazil E-mail: elseoud@iq.usp.br Fax: +55-11-8183874, BR aut https://doi.org/10.1007/s003960050024 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s003960050024 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Novaki L. P. Instituto de Química Universidade de São Paulo C.P. 26.077, 05599-970 São Paulo, S.P., Brazil E-mail: elseoud@iq.usp.br Fax: +55-11-8183874, BR aut NATIONALLICENCE 700 1- Pires P. A. R. Instituto de Química Universidade de São Paulo C.P. 26.077, 05599-970 São Paulo, S.P., Brazil E-mail: elseoud@iq.usp.br Fax: +55-11-8183874, BR aut NATIONALLICENCE 700 1- Seoud O.A. El Instituto de Química Universidade de São Paulo C.P. 26.077, 05599-970 São Paulo, S.P., Brazil E-mail: elseoud@iq.usp.br Fax: +55-11-8183874, BR aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer