ABSTRACT
This chapter discusses two of the common nuclear magnetic resonance (NMR) interactions, chemical shielding and J coupling; more weight is given the effect of the quadrupolar interaction upon the solution-state NMR spectrum. Finally, an argument will be made for the interpretation of the quadrupole coupling constant so that electronic and geometrical data can be obtained from the O spectrum. Thus, the authors had the quadrupolar interaction in the laboratory axis system and in the principal axis system in frequency units. In this chapter, the authors introduce the Townes-Dailey model through a consideration of Cl quadrupole coupling constants. Then, an application of O quadrupole coupling constants to the study of bonding in organic carbonyl compounds will be discussed. The N data for an extensive series of pyridine complexes with Lewis acids were analyzed with a model that yields the occupancy of the nitrogen donor orbital directed toward the Lewis acid.
