Internal rotation of CH3 groups and entropy difference between diastereoisomers: A13C NMR study via relaxation time measurements

1991 ◽  
Vol 4 (2) ◽  
pp. 113-120 ◽  
Author(s):  
Y. Brunel ◽  
C. Coulombeau ◽  
S. Lavaitte ◽  
J. Reisse
Keyword(s):  
Relaxation Time ◽  
Internal Rotation ◽  
Nmr Study

Gas-Phase Dynamic NMR Study of the Internal Rotation inN-Trifluoroacetylpyrrolidine

2003 ◽  
Vol 107 (17) ◽  
pp. 3024-3029 ◽  
Author(s):  
Cristina Suarez ◽  
Elisabeth J. Nicholas ◽  
Molly R. Bowman
Keyword(s):  
Gas Phase ◽  
Internal Rotation ◽  
Dynamic Nmr ◽  
Phase Dynamic ◽  
Nmr Study

Proton NMR Study of Molecular Dynamics in Hydrazinium Perchlorate

1990 ◽  
Vol 45 (2) ◽  
pp. 102-106
Author(s):  
K. Ganesan ◽  
R. Damle ◽  
J. Ramakrishna
Keyword(s):  
Molecular Dynamics ◽  
Relaxation Time ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Proton Spin ◽  
Spin Lattice Relaxation ◽  
Temperature Minimum ◽  
Second Moment ◽  
Spin Lattice ◽  
Nmr Study

AbstractThe proton spin-lattice relaxation time T1 (at 5.4, 10 and 15 MHz) and second moment M2 (at 9.8 MHz) have been measured in hydrazinium Perchlorate (N2H5ClO4). The temperature dependence of T, shows two minima. The low temperature T, minimum has been explained in terms of NH3 reorientation about the N-N axis while the high temperature minimum is attributed to the exchange of protons within the NH2 group (180° flip about the H - N - H bisectrix). The activation energies for NH3 and NH: motions are found to be 20.5 kJ mol-1 and 39.8 kJ mol-1 , respectively. The second moment variation with temperature shows two transitions around 120 K and 210 K and has been discussed in terms of NH3/NH2 motions.

scholarly journals Fresh-cut melon quality during storage: An NMR study of water transverse relaxation time

2015 ◽  
Vol 167 ◽  
pp. 71-76 ◽  
Author(s):  
Joana F. Fundo ◽  
Ana L. Amaro ◽  
Ana Raquel Madureira ◽  
Alexandra Carvalho ◽  
Gabriel Feio ◽  
...  
Keyword(s):  
Relaxation Time ◽  
Transverse Relaxation Time ◽  
Transverse Relaxation ◽  
Nmr Study ◽  
Fresh Cut

NMR study : hindered internal rotation in stable protonated α - haloacetophenones.

1971 ◽  
Vol 12 (32) ◽  
pp. 3005-3008 ◽  
Author(s):  
R. Jost ◽  
P. Rimmelin ◽  
J.M. Sommer
Keyword(s):  
Internal Rotation ◽  
Nmr Study

Internal Rotation of Mutually Interacting Methyl Groups: A13C NMR Study

1997 ◽  
Vol 129 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Reinhard Wimmer ◽  
Norbert Müller
Keyword(s):  
Internal Rotation ◽  
Methyl Groups ◽  
Nmr Study
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