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Issue 31, 2012
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Aggregation of 1-dodecyl-3-methylimidazolium nitrate in water and benzene studied by SANS and 1H NMR

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Abstract

Aggregation of imidazolium-based ionic liquid, C12mim+NO3, in both polar solvent of water and nonpolar solvent of benzene was elucidated by electrical conductivity, small-angle neutron scattering (SANS), and 1H NMR measurements. The electrical conductivities of C12mim+NO3–water solutions at 298 K as a function of ionic liquid concentration showed a break point at 8.4 mmol dm−3 as a cmc. However, those of C12mim+NO3benzene solutions drastically increase in accordance with a cubic function of concentration, but without a break point. The SANS profiles of both aqueous and benzene solutions obviously differ from each other. The profiles of the aqueous solutions indicated the formation of polydisperse spherical micelles. Those of the benzene solutions revealed Ornstein–Zernike behavior. Thus, C12mim+NO3 forms clusters in the benzene solutions, but the shape of clusters is indefinite. On the basis of the 1H NMR chemical shifts of the aqueous solutions, the effect of nitrate on the formation of micelles was discussed on a microscopic scale. Furthermore, the interactions among C12mim+, NO3, and benzene molecules in the benzene solutions were considered according to the 1H NMR data.

Graphical abstract: Aggregation of 1-dodecyl-3-methylimidazolium nitrate in water and benzene studied by SANS and 1H NMR

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Publication details

The article was received on 21 Mar 2012, accepted on 01 Jun 2012 and first published on 01 Jun 2012


Article type: Paper
DOI: 10.1039/C2CP40891K
Phys. Chem. Chem. Phys., 2012,14, 11070-11080

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    Aggregation of 1-dodecyl-3-methylimidazolium nitrate in water and benzene studied by SANS and 1H NMR

    T. Takamuku, T. Shimomura, K. Sadakane, M. Koga and H. Seto, Phys. Chem. Chem. Phys., 2012, 14, 11070
    DOI: 10.1039/C2CP40891K

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