Double-quantum filtered 1H MAS NMR spectra.
It is shown that straightforward double-quantum filtered (1)H MAS NMR experiments yield spectral lineshapes that permit to estimate the minimum number of (1)H spins in a cluster. The approach may offer an alternative to multiple-quantum experiments for the characterisation of (1)H spin clusters of moderate size. The duration of the double-quantum excitation period has to be chosen suitably, it is necessary to find a practical compromise between optimum double-quantum filtration efficiency and optimum information content of the spectral lineshapes. Some (1)H MAS NMR experiments on partially deuterated maleic acid are reported as well as numerical simulations.
Bechmann
Matthias
M
Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany.
Foerster
Hans
H
Maisel
Heidi
H
Sebald
Angelika
A
D000465:Algorithms; D003198:Computer Simulation; D003903:Deuterium / Q000032:analysis / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008298:Maleates / Q000032:analysis* / Q000737:chemistry*; D008956:Models, Chemical; D008958:Models, Molecular; D011522:Protons
D008298:Maleates; D011522:Protons; C030272:maleic acid; D003903:Deuterium