Adiabatic z-filtered J-spectroscopy for absorptive homonuclear decoupled spectra.
J-resolved NMR spectroscopy is a well-established method for measuring coupling constants or enhancing the resolution in homonuclear experiments. Classical J-spectra typically suffer from inevitable dispersive signal contributions and the occurrence of "ghost peaks" due to strong coupling effects. In this article, a J-resolved-type experiment with an adiabatic z-filter element for the selection of inphase magnetization and quadrature detection in the indirect dimension is presented. The phase-sensitive recording scheme allows the distinction of strong coupling artefacts from symmetry relations and the full multiplet obtained by the experiment can be reduced by a simple pattern recognition algorithm. In addition to the J-resolved experiment, a second experiment is introduced that correlates strongly coupled spins. The possibility of homonuclear decoupling using the J-resolved experiment with the pattern recognition algorithm is demonstrated on a number of samples with a detailed description of potential strong coupling artefacts.
Luy
Burkhard
B
Department Chemie, Organische Chemie II, Technische Universität, München, D-85747 Garching, Germany. Burkhard.Luy@ch.tum.de
D002725:Chloroform / Q000032:analysis; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D015233:Models, Statistical; D013331:Strychnine / Q000032:analysis
D002725:Chloroform; D013331:Strychnine