Abstract
A recently introduced density matrix picture for dipolar effects in solution NMR (1996, J. Chem. Phys. 105, 874) gave complete solutions for intermolecular multiple-quantum coherences for single-component samples without scalar couplings. This paper, for the first time, shows that this quantum picture can lead to explicit signal expressions for multicomponent samples of molecules with internal scalar couplings (here assumed to generate a first-order spectrum) and long-range dipolar couplings. Experimental observation of a triplet in the indirectly detected dimension for a heteronuclear CRAZED sequence (13CHCl3 sample, ZQ or 2Q coherences) gives clear evidence that the coupling is due to the intermolecular dipolar coupling. We also make comparisons with classical pictures which introduce the dipolar demagnetization field in multicomponent spin systems.
| Original language | English |
|---|---|
| Pages (from-to) | 114-129 |
| Number of pages | 16 |
| Journal | Journal of Magnetic Resonance |
| Volume | 128 |
| Issue number | 2 |
| DOIs | |
| State | Published - Oct 1997 |
Bibliographical note
Funding Information:This work was supported by the National Institutes of Health under Contract GM35253. S. Lee is grateful for partial financial support from the nondirected research fund of the Korea Research Foundation.