New rotator phase revealed in di-n-alkylammonium bromides studied by solid-state NMR, powder XRD, electrical conductivity and thermal measurements

Shimizu, Toshihiko; Tanaka, Susumu; Onoda-Yamamuro, Noriko; Ishimaru, Shin’ichi; Ikeda, Ryuichi

doi:10.1039/a605760h

Cited by 64 publications

(56 citation statements)

References 3 publications

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“…The sharp change in T 1 value (here a drop from 3.3 s to 0.8 s within a temperature region of 5°C), has been reported for other crystals with plastic/rotator phases at the transition temperature [26,39]. This can be attributed to the sudden onset of rotational motions in the plastic phase, where the new minimum corresponds to a different motion, alternatively to a sudden change in the interaction strength of the proton dipoles due to changing inter-atomic distances.…”

Section: H T 1 Relaxation Measurementsmentioning

confidence: 82%

Plastic crystal behaviour in tetraethylammonium dicyanamide

et al. 2007

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Section: H T 1 Relaxation Measurementsmentioning

confidence: 82%

Plastic crystal behaviour in tetraethylammonium dicyanamide

et al. 2007

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“…Other organic based materials with multiple phase transitions and rotator phases include families of quaternary ammoniumcations, imidazolium-cations and pyrrolidinium-cations [9][10][11][12][13][14]. Organic ionic plastic crystals are closely related to ionic liquids (ILs); most of the cation families that give ILs also give plastic crystals.…”

Section: Introductionmentioning

confidence: 98%

Structure and dynamics of the plastic crystal tetramethylammonium dicyanamide—a molecular dynamics study☆

et al. 2006

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“…4,5 Other organic-based materials with multiple phase transitions and rotator phases include families of quaternary-ammonium cations, imidazolium cations, and pyrrolidinium cations. [6][7][8][9][10][11] The salts based on the N-alkyl-N-methyl-pyrrolidinium cations ͑Fig. 1͒ have been extensively explored in terms of phase behavior, conductivity, etc.…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis, nuclear magnetic resonance spectroscopy, and impedance spectroscopy of N,N-dimethyl-pyrrolidinium iodide: An ionic solid exhibiting rotator phases

Adebahr

Seeber

MacFarlane

et al. 2005

Journal of Applied Physics

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Nuclear magnetic resonance studies on the rotational and translational motions of ionic liquids composed of 1-ethyl-3-methylimidazolium cation and bis (trifluoromethanesulfonyl) N,N-dimethyl-pyrrolidinium iodide has been investigated using differential scanning calorimetry, nuclear magnetic resonance ͑NMR͒ spectroscopy, second moment calculations, and impedance spectroscopy. This pyrrolidinium salt exhibits two solid-solid phase transitions, one at 373 K having an entropy change, ⌬S, of 38 J mol −1 K −1 and one at 478 K having ⌬S of 5.7 J mol −1 K −1 . The second moment calculations relate the lower temperature transition to a homogenization of the sample in terms of the mobility of the cations, while the high temperature phase transition is within the temperature region of isotropic tumbling of the cations. At higher temperatures a further decrease in the 1 H NMR linewidth is observed which is suggested to be due to diffusion of the cations.

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New rotator phase revealed in di-n-alkylammonium bromides studied by solid-state NMR, powder XRD, electrical conductivity and thermal measurements

Cited by 64 publications

References 3 publications

Plastic crystal behaviour in tetraethylammonium dicyanamide

Plastic crystal behaviour in tetraethylammonium dicyanamide

Structure and dynamics of the plastic crystal tetramethylammonium dicyanamide—a molecular dynamics study☆

Thermal analysis, nuclear magnetic resonance spectroscopy, and impedance spectroscopy of N,N-dimethyl-pyrrolidinium iodide: An ionic solid exhibiting rotator phases

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