Mobility inhibition of 1-phenylethanol chiral molecules in strong magnetic fields

Activation Parameters of Self-Diffusion of Aromatic Chiral Molecules in External Magnetic Fields

“…In external magnetic fields of 11.7 and 14.1 T, the 1 H NMR spectra do not show differences in chemical shifts between 1-phenylethanol and 1-phenyl-1-propanol enantiomers in liquid mixtures. , However, as was demonstrated in our study, parameters of self-diffusion mobility of the enantiomers depend on the strength of the external magnetic field. The observed dependence of these parameters may be related to the induced magnetic moments, their interaction with each other and the magnetic field, and the overall changes in correlated motion of electrons in molecules with increasing external magnetic field. ,, We think that studies on molecular mobility in ultrahigh fields could make it possible not only to separate 1 H NMR signals but also to estimate self-diffusion coefficients of individual enantiomers.…”

“…The increase of E values with increasing H 0 cannot be responsible for the ∼10 10 increment in D 0 if assuming that k 1 and k 2 remain constant with changes in magnetic field (Tables and ). Hence, it follows that variation of H 0 changes the type of mobility, which implicitly enters into parameters k 1 and k 2 , if using for analysis of the Arrhenius equation. − Such changes in self-diffusion of aromatic molecules can be related to the induced magnetic moments in aromatic molecules and their interactions with the external magnetic field. , The indicated interactions affect the orientation of the molecules, their hydrodynamic status, and the overall self-diffusion process, as was shown earlier …”

“…The racemate densities of 1-phenylethanol and 1-phenyl-1-propanol were 1.012 and 0.994 g/mL (25 °C), and the viscosities were 8.49 and 13.49 mPa s (25 °C), respectively. Mixtures were prepared by the addition of corresponding enantiomers to their racemates, as was done in refs and . These mixtures were described with the enantiomeric excess parameter ee = ( x R – x S )/( x R + x S ), where x R and x S are the concentration ratios of R and S molecules in the mixture (chiral polarized medium).…”

“…Despite the fact that chiral mixtures of 1-phenylethanol and 1-phenyl-1-propanol were used in the experiments, the separate spectral lines of 1 H NMR of the enantiomers were not observed. This is due to the weak effect of the chiral polarized mediums in the chemical shifts for 1 H nuclei. ,, …”

“…Earlier, it was shown that self-diffusion of aromatic chiral molecules (1-phenylethanol and 1-phenyl-1-propanol) in liquids depends on the magnetic field strength and concentration ratio of enantiomers. , In mixtures consisting of enantiomers, enantiomers may be surrounded by enantiomers of other chirality. The dynamic distribution of molecules must be different and depend on the concentration ratio of enantiomers in a liquid.…”