Solving JHH measurement in overcrowded regions

Accurate measurement of JHH in overlapped signals by a TOCSY-edited SERF Experiment

André Fredi, Pau Nolis* and Teodor Parella*

Magnetic Resonance in ChemistryDOI: 10.1002/mrc.4572

Selective Refocusing (GSERF or the recent PSYCHEDELIC) experiments were originally designed to determine all proton-proton coupling constants (JHH) for a selected proton resonance. They work for isolated signals on which selective excitation can be successfully applied but, as happens in other selective experiments, fail for overlapped signals. To circumvent this limitation, a doubly-selective TOCSY-GSERF scheme is presented for the measurement of JHH in protons resonating in crowded regions. This new experiment takes advantage of the editing features of an initial TOCSY transfer to uncover hidden resonances that become accessible to perform the subsequent frequency-selective refocusing.

 

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