Chemical Physics Letters, Vol.470, No.4-6, 337-341, 2009
Combining STMAS and CRAMPS NMR spectroscopy: High-resolution HETCOR NMR spectra of quadrupolar and H-1 nuclei in solids
High-resolution two-dimensional (2D) heteronuclear correlation spectra between half-integer quadrupolar and H-1 nuclei have been obtained combining Satellite Transition Magic-Angle Spinning (STMAS) and wPMLG3 CRAMPS methods. The experiments use split-t(1) versions of DQ/DQF-STMAS adapted to 3/2 and 5/2 spins to obtain a Na-23 and Al-27 isotropic dimension, respectively. Transfer of magnetization from quadrupolar nuclei to protons has been achieved by cross-polarization, and high-resolution H-1 spectra have been recorded using the wPMLG3 decoupling during the t(2) evolution period. The performance of the pulse sequences have been tested on the templated microporous aluminophosphate IST-1 and trisodium citrate employing a B-0 field of 9.4 T. (C) 2009 Elsevier B. V. All rights reserved.