TY - JOUR
T1 - 1H, 2H, 19F, 31P, and 35Cl NMR studies on molecular motions in ionic plastic phases of pyrrolidinium perchlorate and hexafluorophosphate
AU - Ono, Hiroshi
AU - Ishimaru, Shin'ichi
AU - Ikeda, Ryuichi
AU - Ishida, Hiroyuki
PY - 1999/9/1
Y1 - 1999/9/1
N2 - Measurements of 1H, 2H, 19F, 31P, and 35Cl NMR, differential scanning calorimetry (DSC), and X-ray powder diffraction were carried out in solid pyrrolidinium perchlorate ([C4H8NH2]ClO4) and hexafluorophosphate ([C4H8NH2]PF6). Five and three solid phases were obtained in perchlorate and hexafluorophosphate, respectively, by DSC measurement above 150 K. X-Ray powder patterns showed the highest-temperature solid phase of both salts to be CsCl-type cubic, indicating that both cations and anions take isotropically disordered orientations. The measurements of the NMR linewidth and its second moment revealed that the C4H8NH2+ and PF6- ions perform self-diffusion as well as isotropic rotation in this phase. From the dynamical behaviour of ions, the highest-temperature phase can be assigned to be an ionic plastic phase; this is the first example of an ionic plastic phase containing pyrrolidinium cations.
AB - Measurements of 1H, 2H, 19F, 31P, and 35Cl NMR, differential scanning calorimetry (DSC), and X-ray powder diffraction were carried out in solid pyrrolidinium perchlorate ([C4H8NH2]ClO4) and hexafluorophosphate ([C4H8NH2]PF6). Five and three solid phases were obtained in perchlorate and hexafluorophosphate, respectively, by DSC measurement above 150 K. X-Ray powder patterns showed the highest-temperature solid phase of both salts to be CsCl-type cubic, indicating that both cations and anions take isotropically disordered orientations. The measurements of the NMR linewidth and its second moment revealed that the C4H8NH2+ and PF6- ions perform self-diffusion as well as isotropic rotation in this phase. From the dynamical behaviour of ions, the highest-temperature phase can be assigned to be an ionic plastic phase; this is the first example of an ionic plastic phase containing pyrrolidinium cations.
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U2 - 10.1246/bcsj.72.2049
DO - 10.1246/bcsj.72.2049
M3 - Article
AN - SCOPUS:0032861497
VL - 72
SP - 2049
EP - 2054
JO - Bulletin of the Chemical Society of Japan
JF - Bulletin of the Chemical Society of Japan
SN - 0009-2673
IS - 9
ER -