Proton-proton homonuclear dipolar decoupling in solid-state NMR using rotor-synchronized z-rotation pulse sequences.
We present a theoretical analysis of rotor-synchronized homonuclear dipolar decoupling schemes that cause a z-rotation of the spins. These pulse sequences applicable at high spinning rates (nu(r) > or = 30 kHz) yield high-resolution proton NMR spectra that are free of artifacts, such as zero lines and image peaks. We show that the scaled isotropic chemical-shift positions of proton lines can be calculated from the zero-order average Hamiltonian and that the scaling factor does not depend on offset. The effects of different adjustable parameters (rf field, spinning rate, pulse shape, offset) on the decoupling performance are analyzed by numerical simulations of proton spectra and by (1)H solid-state NMR experiments on NaH(2)PO(4) and glycine.
Lafon
Olivier
O
Unité de Catalyse et de Chimie du Solide, UMR CNRS 8181, Ecole Nationale Supérieure de Chimie de Lille, Université de Lille 1, B.P. 90108, 59652 Villeneuve d'Ascq Cedex, France. olivier.lafon@ensc-lille.fr
Wang
Qiang
Q
Hu
Bingwen
B
Trébosc
Julien
J
Deng
Feng
F
Amoureux
Jean-Paul
JP
D003198:Computer Simulation; D005998:Glycine; D009682:Magnetic Resonance Spectroscopy / Q000295:instrumentation / Q000379:methods*; D008962:Models, Theoretical; D010710:Phosphates; D011522:Protons
D010710:Phosphates; D011522:Protons; C018279:sodium phosphate; D005998:Glycine