NMR study on relationships between reorientational dynamics and phase behaviour of room-temperature ionic liquids: 1-alkyl-3-methylimidazolium cations

Literature Information

Publication Date 2010-01-27
DOI 10.1039/B922931K
Impact Factor 3.676
Authors

Mamoru Imanari, Kei-ichi Uchida, Kozue Miyano, Hiroko Seki, Keiko Nishikawa


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Abstract

We measured longitudinal and transverse relaxation times (T1 and T2) for 1H, 13C-T1 and 13C spectra for room-temperature ionic liquids of 1-alkyl-3-methylimidazolium bromide [Cnmim]Br (n = 2, 3, 4) as a function of temperature. Their values and spectra reveal close relationships between their unique phase behaviours and the dynamics of carbons constituting the cations. Carbons in these cations are classified into groups according to their dynamics, namely imidazolium carbons, an N-methyl carbon, a terminal methyl carbon of the alkyl group and others of the alkyl group. The temperature dependences of T1 values for these groups differ greatly, resulting in a variation in the characteristic thermal behaviours of the salts. Values of 1H-T1 and 13C-T1 suggest that some carbons continue to move even in the crystalline and/or solid states. Using 13C-T1 data, we also estimated the temperature dependences of the correlation times for the segmental motions of carbons in the liquid states.

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Source Journal

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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