Abstract
The solvent proton nuclear magnetic resonance peak may be suppressed to arbitrarily low levels (<10 −4) by exploiting the effects of paramagnetic relaxation reagents on the solvent transverse relaxation rates. Specifically, we demonstrate successful elimination of the water peak in aqueous solutions with retention of solute resolution by application of the Meiboom-Gill modification of the Carr-Purcell spin-echo sequence used in combination with several classes of paramagnetic relaxation agents that are added at low concentrations (<0.2 m M). We show that the method is quite general and that its use permits observation of solute resonances otherwise obscured by the water resonance.
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