ChemInform Abstract: TEMPERATURE-DEPENDENT STUDY OF CARBON-13 SPIN-LATTICE RELAXATION TIMES IN PARA-AZOXYANISOLE - A NEMATIC LIQUID CRYSTAL

1974 ◽  
Vol 5 (40) ◽  
pp. no-no
Author(s):  
M. SCHWARTZ ◽  
P. E. FAGERNESS ◽  
C. H. WANG ◽  
D. M. GRANT
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Temperature Dependent ◽  
Spin Lattice ◽  
Temperature Dependent Study

Molecular motion in the lyotropic liquid crystal system containing potassium palmitate: A study of proton spin-lattice relaxation times

1979 ◽  
Vol 36 (2) ◽  
pp. 151-171 ◽  
Author(s):  
K.R Jeffrey ◽  
T.C Wong ◽  
E.E Burnell ◽  
M.J Thompson ◽  
T.P Higgs ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Molecular Motion ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Proton Spin ◽  
Lyotropic Liquid Crystal ◽  
Spin Lattice Relaxation ◽  
Crystal System ◽  
Spin Lattice ◽  
Liquid Crystal System

A 35CL NQR Spin-Lattice Relaxation Study on the Motion of D4h Anions in [C(NH2)3]2PdCl4, [C(NH2)3]2PtCl4, and [C(NH2)3]AuCl4

1986 ◽  
Vol 41 (1-2) ◽  
pp. 416-420
Author(s):  
Yoshihiro Furukawa ◽  
Daiyu Nakamura
Keyword(s):  
Relaxation Times ◽  
Sharp Decrease ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Temperature Dependent ◽  
Spin Lattice ◽  
35Cl Nqr ◽  
The One ◽  
Increasing Temperature ◽  
Complex Anions

The temperature dependence of 35Cl NQR spin-lattice relaxation times T1ClQ was observed for the crystal of the title complexes. For the Pd(II) and Pt(II) complexes, the log T1ClQ vs. 103 T-1 curves having gentle positive gradients at lower temperatures decreased sharply with increasing temperature from ca. 150 and ca. 130 K, respectively. This sharp decrease of T1ClQ can be explained by the C4 reorientation of the D4h complex anions with the activation energy Ea of 34 kJ mol-1 for the former and 29 kJ mol-1 for the latter complex. These values agree well with those estimated from 1H T1 showing temperature dependent dipolar-quadrupolar cross relaxation. For the Au(III) salt, two of four 35Cl NQR lines showed a sharp decrease in T1ClQ from ca. 270 K, suggesting the onset of the C4 reorientation of the one kind crystallographically equivalent anions with Ea of 67 kJ mol-1.

Proton Spin-Lattice Relaxation in the Nematic Liquid Crystal MBBA

1972 ◽  
Vol 16 (3) ◽  
pp. 213-221 ◽  
Author(s):  
Ronald Y. Dong ◽  
W. F. Forbes ◽  
M. M. Pintar
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Lattice Relaxation ◽  
Proton Spin ◽  
Spin Lattice Relaxation ◽  
Spin Lattice

ANISOTROPIC NUCLEAR SPIN‐LATTICE RELAXATION IN A NEMATIC‐LIQUID CRYSTAL

1970 ◽  
Vol 17 (8) ◽  
pp. 318-320 ◽  
Author(s):  
C. E. Tarr ◽  
M. A. Nickerson ◽  
C. W. Smith
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Nuclear Spin ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Nuclear Spin Lattice Relaxation

Proton Spin-Lattice Relaxation in the Critical Regime of a Nematic Liquid Crystal

1980 ◽  
Vol 58 (3-4) ◽  
pp. 161-178 ◽  
Author(s):  
S. K. Ghosh ◽  
E. Tettamanti ◽  
A. Panatta
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Lattice Relaxation ◽  
Proton Spin ◽  
Spin Lattice Relaxation ◽  
Critical Regime ◽  
Spin Lattice

13C chemical shifts and spin‐lattice relaxation in the nematic liquid crystal 4‐cyano‐4′‐n‐pentylbiphenyl

1983 ◽  
Vol 78 (2) ◽  
pp. 632-637 ◽  
Author(s):  
John S. Lewis ◽  
E. Tomchuk ◽  
H. M. Hutton ◽  
E. Bock
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Chemical Shifts ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
13C Chemical Shifts ◽  
Spin Lattice

Dynamical Behavior of a Nematic Liquid Crystal just above the Nematic-Isotropic Transition from Spin-Lattice Relaxation

1972 ◽  
Vol 29 (10) ◽  
pp. 638-641 ◽  
Author(s):  
S. K. Ghosh ◽  
E. Tettamanti ◽  
P. L. Indovina
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Dynamical Behavior ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice

35Cl NQR Studies of Hydrogen Transfer in Crystalline p-Chlorobenzoic Acid

2000 ◽  
Vol 55 (1-2) ◽  
pp. 355-358 ◽  
Author(s):  
Taka-aki Nihei ◽  
Shin'ichi Ishimaru ◽  
Ryuichi Ikeda
Keyword(s):  
Hydrogen Transfer ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Temperature Dependent ◽  
Chlorobenzoic Acid ◽  
Spin Lattice ◽  
H Nmr ◽  
Double Proton Transfer ◽  
Carboxylic Acid Dimer

35Cl NQR frequencies and spin-lattice relaxation times T1Q were measured in p-ClC6H4CO2H(PCB A) and p-ClC6H4CO2D(PCBA-d1) at 77-333 K. T1Q in PCB A gave a shallow minimum of 8.0 ms at ca. 110 K, which could be explained by a double proton transfer mechanism in the carboxylic acid dimer referring to 1H NMR data giving a T1H minimum at almost the same temperature. PCBA-d1, showed temperature dependent NQR frequencies quite analogous to those in PCBA, whereas their T1Q behaviour was quite different in its minimum value and its temperature as well as temperature gradient. These results were explained by suppressed deuteron tunnelling and the Ubbelohde effect.

Nuclear Zeeman and Dipolar Spin-Lattice Relaxation in the Reentrant Nematic Liquid Crystal OBBC

1988 ◽  
Vol 57 (7) ◽  
pp. 2550-2556 ◽  
Author(s):  
Seiichi Miyajima ◽  
Takehiko Chiba
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice
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