14N nuclear magnetic resonance of some monosubstituted pyridines

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Abstract
The 14N chemical shifts of some monosubstituted pyridines are reported. They show a correlation with the electronic nature of the substituent which is not found with earlier 14N chemical shift data. The shifts may be satisfactorily explained in terms of the average excitation energy approximation if both π- and σ-bond polarization is considered by means of SCF-MO calculations and 14N nuclear quadrupole resonance data. The 14N N.M.R. line widths are discussed from the point of view of molecular reorientation processes in the liquid state.