Temperature, concentration and spinning speed dependence in N.M.R. spectra of oriented molecules

Publisher Website
Google Scholar
Abstract
It is evident from the above studies that meaningful values for a degree of orientation must always be reported along with solute concentration, temperature and spinning speed. The practically linear relation between temperature and relative degree of orientation allows one to predict the appearance of spectra at high temperatures from results at relatively low temperatures. The variation of degree of orientation with the change of temperature, concentration and spinning speed should help the analysis of complex spectra because it allows one to separate the variable direct coupling constants from the normally constant indirect coupling parameters, analogous to the separation of J from δ by application of a variable magnetic field or solvents in ‘isotropic’ spectra.