Author:
Wasylishen RE,Barron PF,Doddrell DM
Abstract
Carbon-13 N.M.R.
spectra of tris(hydroxymethyl)aminomethane
(Tris) have been measured between 407 and 461 K. Proton-decoupled 13C
N.M.R. spectra of solid Tris between
407 K and its melting point are relatively sharp (v� < 30 Hz)
indicating rapid overall molecular reorientation in this temperature range. It
was not possible to detect a 13C N.M.R, signal for Tris below 407 K.
The observed 13C N.M.R. spin-lattice relaxation times appear
continuous across the solid ↔ liquid phase transition. From the
temperature dependence of T1, a rotational activation energy of 51.6
� 6 kJ mol-1 is calculated, which indicates that the molecules must
expend considerable energy in reorienting. The N.M.R. results are discussed in
relation to previous differential scanning calorimetry
and X-ray diffraction data which indicate that Tris undergoes a solid ↔ solid
transition at 407 K.
Cited by
15 articles.
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