ABSTRACT
NMR relaxation theory and NMR lineshape calculations were used to characterize the rates of C2 symmetry jumps of deuterium nuclei in partly deuterated gypsum powder. The experimental data consisted of variable temperature deuterium NMR powder line shapes and deuterium T1 relaxation times. All of the Mathematica© notebooks used to simulate the spectra and match the experimental T1 values are included as supplementary material, and are suitable templates for similar calculations on other systems. Our simulations show that the deuterium nuclei of D2O in Gypsum undergo a two-site C2 180° jump about the D-O-D bisector angle of 54.8°. The jump rate stays in the fast motion regime down to about 218â¯K. Below 193â¯K the powder lineshapes change, the spectral intensities drop significantly, and the motion slows into the intermediate motion regime. The best fit quadrupole coupling constants (QCC's) vary between 216â¯kHz at the highest temperatures to 235â¯kHz at the lowest temperatures. The asymmetry parameters (ɳ) vary between 0.11 at the highest temperatures to 0.15 at the lowest temperatures. Knowledge of the C2 jump rates allowed us to calculate activation parameters for the jumps, namely ΔH = 22â¯kJ/mol, and ΔS = -10â¯J/mol·K which indicate a non-spontaneous activation process, an activation energy of Eaâ¯=â¯23â¯kJ/mol, and a pre-exponential factor of Aâ¯=â¯3.6â¯×â¯1012. As expected, there was no evidence of quantum tunneling.
ABSTRACT
The photochemical reaction of acetophenone and cyclohexane in the zeolite NaY occurs by combination of the geminate radical pairs to give products that reveal a significant amount of rotational fluidity, which was also documented by intermolecular nuclear dipolar interaction measurements using cross polarization (13)C NMR (CPMAS) experiments.
Subject(s)
Acetophenones/chemistry , Cyclohexanes/chemistry , Zeolites/chemistry , Carbon Isotopes , Magnetic Resonance Spectroscopy , Photochemical ProcessesABSTRACT
We have used (2)H NMR lineshape analyses and single crystal X-ray diffraction (XRD) to investigate the effects of molecular structure and crystalline environment on the rotational dynamics of methyl groups in four aromatic cycloalkanones. These include two methyl-substituted anthrones, one anthraquinone and one dibenzosuberone, which are known to undergo excited state H-atom tunneling from the ortho-methyl group to the carbonyl oxygen. With experiments conducted between 100 and 300K, samples 1,4-dimethylanthrone (DMAT) and 1,4-dimethylanthraquinone (DMAQ) were shown to enter the intermediate exchange regime (k(rot) approximately <10(7)s(-1)) at ca. 120K while samples of 1,4,10,10-tetramethylanthrone (TMAT) and 1,4-dimethyldibenzosuberone (DMDBS) remained in the fast exchange regime even at ca. 100K. Single crystal XRD analyses suggest that high intramolecular hindrance is avoided by molecular distortions, and that intermolecular contacts play an important role.