A new sequence for the MQMAS/HETCOR experiment.
Two-dimensional (2D) multiple quantum MAS (magic angle spinning) spectroscopy has been combined with cross-polarisation to obtain a heteronuclear correlation spectrum between a quadrupolar spin-3/2 and a spin-1/2 nucleus. The advantage over the conventional correlation experiment is the increased resolution obtained in the multiple quantum dimension. Pure absorption 2D spectra can be obtained by implementing a zero quantum filter between the evolution of multiple quanta and the subsequent cross-polarisation step. The current experiment shows a considerable improvement in sensitivity compared to a previously introduced sequence.
Steuernagel
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Bruker Analytik, Silberstreifen, Rheinstetten, Germany.
D006801:Humans; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D011122:Polyphosphates / Q000737:chemistry; D013113:Spin Labels
D011122:Polyphosphates; D013113:Spin Labels; C009293:trimetaphosphoric acid