CHANGES IN THE ANISOTROPY OF QUINOLINE MOLECULAR-REORIENTATION IN THELIQUID-STATE AS PROBED BY C-13 AND N-14 NUCLEAR-MAGNETIC-RESONANCE RELAXATION-TIMES
D. Jalabert et al., CHANGES IN THE ANISOTROPY OF QUINOLINE MOLECULAR-REORIENTATION IN THELIQUID-STATE AS PROBED BY C-13 AND N-14 NUCLEAR-MAGNETIC-RESONANCE RELAXATION-TIMES, Molecular physics, 79(3), 1993, pp. 673-683
At the same temperature T(t) (290 K), the derivatives with respect to
the temperature of the C-13 T1 spin-lattice relaxation times, of the N
-14 spin-spin relaxation time and of the saturated specific heat of qu
inoline show a large variation. The calculations of the rotational dif
fusion coefficients from the nuclear magnetic resonance data show that
the molecular motion is more anisotropic below T(t) than above. A lar
ge change is observed at T(t) for the energy barrier of the rotation a
round one of the molecular axes. This may be interpreted as due to a c
hange in molecular organization at T(t).