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The NMR spectra of spin-1/2 pairs contains four peaks, with two inner peaksmuch stronger than the outer peaks in the near-equivalence regime. We haveobserved that the strong inner peaks have significantly different linewidths,when measurements were performed on a 13C2-labelled triyne derivative. Thislinewidth difference may be attributed to strong cross-correlation effects. Wedevelop the theory of cross-correlated relaxation in the case ofnear-equivalent homonuclear spin-1/2 pairs, in the case of a moleculeexhibiting strongly anisotropic rotational diffusion. Good agreement is foundwith the experimental NMR lineshapes.

Cross-correlation effects in the solution NMR spectra of near-equivalent spin-1/2 pairs