Improved NMR methods for the direct 13C-satellite-selective excitation in overlapped 1H-NMR spectra.
Improved pulsed-field gradient echo methods are presented and discussed for the direct selective excitation of the (13)C-satellite lines in overcrowded (1)H NMR spectra of small molecules. Sensitivity enhancements in (13)C spin-state selection can be achieved by combining multiple-proton-frequency excitation and Hadamard phase encoding. Several satellite-selective (SATSEL) NMR experiments are proposed and exemplified by measuring the sign and the magnitude of small, long-range proton-carbon coupling constants for (1)H resonances showing several levels of signal overlapping.
Nolis
Pau
P
Servei de Ressonància Magnètica Nuclear, Universitat Autònoma de Barcelona, E-08193, Bellaterra, Barcelona, Spain.
Gil
Sergio
S
Espinosa
Juan Félix
JF
Parella
Teodor
T
D002247:Carbon Isotopes; D009682:Magnetic Resonance Spectroscopy / Q000295:instrumentation* / Q000379:methods / Q000592:standards; D008962:Models, Theoretical; D011522:Protons
D002247:Carbon Isotopes; D011522:Protons