NMR Study of Molecular Motions and Phase Transitions in Cyclohexene

1969 ◽  
Vol 50 (8) ◽  
pp. 3462-3466 ◽  
Author(s):  
Z. M. El Saffar ◽  
R. G. Eades ◽  
J. P. Llewellyn
Keyword(s):  
Phase Transitions ◽  
Molecular Motions ◽  
Nmr Study

Molecular motions in the solid phases of n-heneicosane: a deuteron NMR study

1984 ◽  
Vol 106 (8) ◽  
pp. 2267-2270 ◽  
Author(s):  
Eric C. Kelusky ◽  
Ian C. P. Smith ◽  
Carl A. Elliger ◽  
David G. Cameron
Keyword(s):  
Molecular Motions ◽  
Nmr Study ◽  
Solid Phases ◽  
Deuteron Nmr

Molecular Motions and Phase Transitions in Solid CH3NH3PbX3 (X = C1, Br, I) as Studied by NMR and NQR

1991 ◽  
Vol 46 (3) ◽  
pp. 240-246 ◽  
Author(s):  
Qiang Xu ◽  
Taro Eguchi ◽  
Hirokazu Nakayama ◽  
Nobuo Nakamura ◽  
Michihiko Kishita
Keyword(s):  
Phase Transitions ◽  
Temperature Dependence ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Molecular Motions ◽  
Isotropic Reorientation ◽  
Higher Temperature ◽  
Successive Phase

AbstractThe temperature dependence of 35C1, 81Br, and 127I NQR frequencies and 1Hspin-lattice relaxation times (T1) for CH3NH3PbX3 (X = Cl, Br, I) was measured through the successive phase transitions in these solids. The isotropic reorientation of the CH3NH3 ions takes place in the higher-temperature phases (tetragonal [I4/mcm] and cubic) of the three salts (Ea= 11 kJ mol -1). T1's in the lowest-temperature phases (orthorhombic) indicate that the cations undergo correlated C3-reorientation in the chloride (Ea = 5.45 kJ mol -1)and in the iodide (Ea = 5.80 kJ mol -1, whereas correlated (Ea = 2.40 kJ mol-1) and uncorrected (Ea = 7.50 kJ mol-1) C3- reorientations are excited in the bromide. It is also revealed that the rotational tunneling of the cations governs T1 at lowtemperature region in the orthorhombic phases of these salts

NMR Study of Phase Transitions in Betaine Phosphite (CH3)3NCH2COOH·H2PO3

2003 ◽  
Vol 72 (9) ◽  
pp. 2250-2255 ◽  
Author(s):  
Mitsuo Machida ◽  
Hirotaka Ikeda ◽  
Takaaki Kakiuchi ◽  
Toku Ishibashi ◽  
Katsuhiko Hasebe
Keyword(s):  
Phase Transitions ◽  
Nmr Study
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