1516-55-8Relevant articles and documents
1H NMR and 35Cl NQR spin-lattice relaxation study of molecular motion in solid trimethylamine-trichloroborane complex
Furukawa, Yoshihiro
, p. 101 - 106 (1994)
The temperature dependences of spin-lattice relaxation times (T1) of 1H NMR and 35Cl NQR were measured for the molecular complex of (CH3)3N-BCl3.Two T1 (16MHz) minima in the 1H NMR spectra observed below and above room temperature were attributed to three-fold reorientations of the CH3 and N(CH3)3 groups, respectively, and the motional parameters for each group were determined.The 35Cl T1 below and above 200 K was dominated by lattice vibrations and reorientation of the BCl3 group, respectively.The activation energies for the N(CH3)3 and BCl3 reorientations determined from the 1H and 35Cl T1 data were experimentally the same, indicating that the (CH3)3N-BCl3 molecule in the crystal reorientates as a whole. A structural phase transition was observed at 388 K, recognized by a break in the 1H T1 vs.T plot, and was confirmed by differential thermal analysis.
