Proton spin–lattice relaxation studies of molecular motion and phase transitions in solid choline chloride, bromide, iodide, and perchlorate

1977 ◽  
Vol 66 (7) ◽  
pp. 3240-3245 ◽  
Author(s):  
C. A. McDowell ◽  
P. Raghunathan ◽  
D. S. Williams
Keyword(s):  
Phase Transitions ◽  
Molecular Motion ◽  
Choline Chloride ◽  
Lattice Relaxation ◽  
Proton Spin ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Relaxation Studies

Spectroscopic and differential scanning calorimetric studies of the phase transitions in oxanorbornane

1998 ◽  
Vol 76 (10) ◽  
pp. 1365-1370 ◽  
Author(s):  
Ralph M Paroli ◽  
Denis FR Gilson ◽  
Ian S Butler
Keyword(s):  
Phase Transitions ◽  
Group Analysis ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Proton Spin ◽  
Factor Group ◽  
Spin Lattice Relaxation ◽  
Differential Scanning Calorimetric ◽  
Spin Lattice ◽  
Calorimetric Studies

Oxanorbornane (7-oxabicyclo[2.2.1]heptane, C6H10O) resembles other bicycloheptane-like molecules by exhibiting order-disorder transitions in the solid state. Differential scanning calorimetric studies show that five different phases may occur, with hysteresis in the transition temperatures. The vibrational spectra have been examined, and a factor group analysis of the vibrational splittings indicates that the crystal structure of the ordered phase has D2d symmetry. Activation energies for molecular motions were derived from proton spin-lattice relaxation time measurements.Key words: oxanorbornane, order-disorder, phase transitions.

Proton spin-lattice relaxation studies of [D-Ala2-Met5]enkephalin

1980 ◽  
Vol 102 (5) ◽  
pp. 1517-1520 ◽  
Author(s):  
Neri Niccolai ◽  
Victor Garsky ◽  
William A. Gibbons
Keyword(s):  
Lattice Relaxation ◽  
Proton Spin ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Relaxation Studies
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