High-resolution heteronuclear correlation spectra between 31P and 27Al in microporous aluminophosphates.
A solid-state nuclear magnetic resonance (NMR) experiment, which provides high-resolution two-dimensional heteronuclear correlation (HETCOR) spectra between 27Al and 31P, is described. The first part of the experiment uses triple-quantum or quintuple-quantum magic-angle spinning (MQMAS) NMR of spin-5/2 nuclei (27Al) to produce an isotropic echo that is unaffected by the second-order quadrupolar broadening. The magnetization is then transferred to the spin-1/2 (31P) nuclei via cross-polarization (CP), resulting in isotropic resolution in both spectral dimensions. To illustrate its usefulness, this method (referred to as MQHETCOR) is applied to two important microporous framework aluminophosphates, hydrated VPI-5 and AIPO4-40.
Fernande
C
C
Laboratoire Catalyse et Spectrochimie (CNRS UMR 6506), ISMRA/Université de Caen, France. christian.fernandez@ismra.fr
Morais
C
C
Rocha
J
J
Pruski
M
M
D000535:Aluminum; D017607:Aluminum Compounds; D009682:Magnetic Resonance Spectroscopy; D010710:Phosphates; D010759:Phosphorus Isotopes
D017607:Aluminum Compounds; D010710:Phosphates; D010759:Phosphorus Isotopes; D000535:Aluminum; C012714:aluminum phosphate