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Issue 22, 2014
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13C NMR relaxation and reorientation dynamics in imidazolium-based ionic liquids: revising interpretation

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Abstract

The temperature dependencies of 13C NMR relaxation rates in [bmim]PF6 ionic liquid have been measured and the characteristic times (τc) for the cation reorientation have been recalculated. We found the origin of the incorrect τc temperature dependencies that were earlier reported for ring carbons in a number of imidazolium-based ILs. After a correction of the approach 13C T1, the relaxation data allowed us to obtain the characteristic times for an orientation mobility of each carbon, and a complicated experiment, such as NOE, was not required. Thus the applicability of 13C NMR relaxation rate measurements to the calculation of the characteristic times for reorientation of all the carbons of the [bmim]+ cation was confirmed and our findings have shown that a 13C NMR relaxation technique allowed its application to ionic liquids to be equally successful as for other liquid systems.

Graphical abstract: 13C NMR relaxation and reorientation dynamics in imidazolium-based ionic liquids: revising interpretation

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Publication details

The article was received on 12 Feb 2014, accepted on 07 Apr 2014 and first published on 09 Apr 2014


Article type: Paper
DOI: 10.1039/C4CP00637B
Citation: Phys. Chem. Chem. Phys., 2014,16, 10480-10484
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    13C NMR relaxation and reorientation dynamics in imidazolium-based ionic liquids: revising interpretation

    V. V. Matveev, D. A. Markelov, E. A. Brui, V. I. Chizhik, P. Ingman and E. Lähderanta, Phys. Chem. Chem. Phys., 2014, 16, 10480
    DOI: 10.1039/C4CP00637B

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