Analysis of generalized two-dimensional homonuclear nmr spectra

Abstract

Analysis of the free induction decays from 90°–90° two-dimensional homonuclear pulse sequences gives complete spectral information from each transition in the f2 dimension. Theoretical intensities and frequencies are illustrated for the common cases AX, A2X, AMX, A2X2, AA′XX′, and A2X3 along with experimental examples of each. An analysis of intensities is given. From these examples it should be possible to determine chemical shift and spin-coupling values even when many lines in the f2 dimension are obscured by other spectral features.