![]() The sensitivity gain comes from starting the experiment with proton excitation and subsequently transferring the magnetisation onto carbon (the process known as polarisation transfer). Most often used to analyse coupling relationships between protons, but may be used to correlate any high-abundance homonuclear spins eg 31P, 19F and 11B.ĭEPT: Distortionless Enhancement by Polarisation TransferĪ 1D experiment used for enhancing the sensitivity of carbon observation and for editing of 13C spectra. ![]() The presence of off-diagonal peaks (cross-peaks) in the spectrum directly correlates the coupled partners. Used to identify nuclei that share a scalar (J) coupling. This carbon-detected experiments has largely been superseded by the more sensitive proton-detected HMBC experiment. ![]() The modification in APT aims to improve the intensity of the slowly relaxing non-protonated centres by using a smaller initial excitation pulse to reduce saturation.ĬOLOC: Correlation through Long-Range CouplingĪ 2D experiment for determining long-range (2 or 3-bond) correlations between proton and carbon nuclei and thus piecing together organic structures. An experiment derived from the JMOD experiment and also used for the multiplicity editing of carbon-13 spectra. ![]()
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