50 and More Essential NMR Experiments. A Detailed Guide - download pdf or read online

By Matthias Findeisen,Stefan Berger

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Barbato, R. Bazzo, "Sensitivity enhancement of a two-dimensional experiment for the measurement of heteronuclear long-range coupling constants, by a new scheme of coherence selection by gradients" J. Magn. Reson. 2001, 148, 209–213. [7] A. Meissner, O. W. Sørensen, "Measurement of J(H,H) and long-range J(X,H) coupling constants in small molecules, broadband XLOC and JHMBC" Magn. Reson. Chem. 2001, 39, 49–52. [8] R. Wagner, S. Berger, "ACCORD-HMBC: A superior technique for structural elucidation" Magn.

6-3 8. Comments 20 23 HMBC has originally been derived from HMQC by simply increasing the delay after the ¿rst pulse before the creation of multiple-quantum coherence. 6-1 comprise this original experiment [1]. The ¿rst 90° proton pulse creates a transverse proton magnetization − I H y as in Equation (1). During the delay d4 the 2J and 3J CH spin couplings develop and create antiphase magnetization 2 I H x I C z . I Hx πJ τI z ICz IH + I C ⎯⎯ ⎯→ − I H + I C ⎯⎯⎯H⎯ ⎯ ⎯→ 2 IH IC z z y z x z The two 13C pulses p3 and p4 and the three gradient pulses g1 to g3 during the preparation period p serve as a dual-stage low-pass ¿lter [7].

3] A. G. Palmer III, J. Cavanagh, P. E. Wright, M. Rance "Sensitivity improvement in protondetected two-dimensional heteronuclear correlation NMR spectroscopy" J. Magn. Reson. 1991, 93, 151–170. [4] G. Kontaxis, J. Stonehouse, E. D. Laue, J. Keeler "The sensitivity of experiments which use gradient pulses for coherence pathway selection" J. Magn. Reson. Ser. A 1994, 111,70–76. [5] J. Schleucher, M. Schwendinger, M. Sattler, P. Schmidt, O. Schedletzky, S. J. Glaser, O. W. Sørensen, C. Griesinger "A general enhancement scheme in heteronuclear multidimensional NMR employing pulsed-¿eld gradients" J.

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50 and More Essential NMR Experiments. A Detailed Guide by Matthias Findeisen,Stefan Berger

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