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Titolo:
PHASE-TRANSITIONS AND IONIC MOTIONS IN SOLID TRIMETHYLETHYLAMMONIUM IODIDE STUDIED BY H-1 AND I-127 NMR, ELECTRICAL-CONDUCTIVITY, X-RAY-DIFFRACTION, AND THERMAL-ANALYSIS
Autore:
ISHIDA H; FURUKAWA Y; KASHINO S; SATO S; IKEDA R;
Indirizzi:
OKAYAMA UNIV,FAC SCI,DEPT CHEM OKAYAMA 700 JAPAN HIROSHIMA UNIV,FAC SCH EDUC,DEPT CHEM HIGASHIHIROSHIMA 739 JAPAN GIFU UNIV,FAC EDUC,DEPT CHEM GIFU 50111 JAPAN UNIV TSUKUBA,DEPT CHEM TSUKUBA IBARAKI 305 JAPAN
Titolo Testata:
Berichte der Bunsengesellschaft fur Physikalische Chemie
fascicolo: 4, volume: 100, anno: 1996,
pagine: 433 - 439
SICI:
0005-9021(1996)100:4<433:PAIMIS>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
NUCLEAR-MAGNETIC-RESONANCE; CATIONIC SELF-DIFFUSION; PLASTIC PHASE; MOLECULAR MOTIONS; F-19 NMR; REORIENTATIONAL MOTIONS; DEUTERON NMR; METHYLAMMONIUM; H-1-NMR; PERCHLORATE;
Keywords:
CRYSTAL STRUCTURE; PHASE TRANSITIONS; SPECTROSCOPY, NUCLEAR MAGNETIC RESONANCE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
37
Recensione:
Indirizzi per estratti:
Citazione:
H. Ishida et al., "PHASE-TRANSITIONS AND IONIC MOTIONS IN SOLID TRIMETHYLETHYLAMMONIUM IODIDE STUDIED BY H-1 AND I-127 NMR, ELECTRICAL-CONDUCTIVITY, X-RAY-DIFFRACTION, AND THERMAL-ANALYSIS", Berichte der Bunsengesellschaft fur Physikalische Chemie, 100(4), 1996, pp. 433-439

Abstract

H-1 and I-127 NMR, differential thermal analysis (DTA), differential scanning calorimetry (DSC), electrical conductivity, and powder and single crystal X-ray diffractions were studied for trimethylethylammonium iodide. Three solid phases, named I, II, and III, were obtained above 410 K, between 336 and 410 K, and below 336 K, respectively. Powder X-ray patterns showed that Phase I and II have a NaCl-type cubic structure (a = 10.00(1) Angstrom, Z = 4) and a tetragonal structure (a = 8.430(5), c = 6.216(4) Angstrom, Z = 2), respectively. The structure of Phase III was determined to be orthorhombic (Pnam (#62), a = 11.294(4), b = 10.729(2), c = 7.158(6) Angstrom, Z = 4) by single crystal X-raydiffraction. In Phase III, the C-3 reorientation of CH3 groups and the C-3' reorientation of the whole (CH3)(3)N group in the cation were observed by H-1 NMR. In Phase II, the cation is expected to perform thequasi-isotropic reorientation. In Phase I, the cation was found to carry out the isotropic reorientation, while the spherical anion the translational self-diffusion, as evidenced by H-1 and I-127 NMR, and electrical conductivity. Phase II and I are, therefore, dynamically disordered phases; especially, Phase I is highly disordered. From the dynamical behaviour of the cation and anion, and thermal properties, Phase Ican be classified into an ionic plastic phase with a NaCl-type structure.

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Documento generato il 24/09/20 alle ore 10:35:05