Efficient symmetry-based homonuclear dipolar recoupling of quadrupolar spins: double-quantum NMR correlations in amorphous solids
2008 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 10, no 44, 6635-6644 p.Article in journal (Refereed) Published
We report novel symmetry-based pulse sequences for exciting double-quantum (2Q) coherences between the central transitions of half-integer spin quadrupolar nuclei in the NMR of rotating solids. Compared to previous 2Q-recoupling techniques, numerical simulations and Na-23 and Al-27 NMR experiments on Na2SO4 and the open-framework aluminophosphate AlPO-CJ19 verify that the new dipolar recoupling schemes display higher robustness to both radio-frequency field inhomogeneity and to spreads in resonance frequencies. These advances allowed for the first demonstration of 2Q-recoupling in an amorphous solid for revealing its intermediate-range structural features, in the context of mapping Al-27-Al-27 connectivities between the aluminium polyhedra (AlO4, AlO5 and AlO6) of a lanthanum aluminate glass (La0.18Al0.82O1.5).
Place, publisher, year, edition, pages
2008. Vol. 10, no 44, 6635-6644 p.
nuclear-magnetic-resonance, angle-spinning nmr, double-rotation nmr, magic-angle, state nmr, rotary resonance, correlation spectroscopy, aluminosilicate glasses, resolution, al
IdentifiersURN: urn:nbn:se:su:diva-57859DOI: 10.1039/b808295bISI: 000260775400007OAI: oai:DiVA.org:su-57859DiVA: diva2:418364
authorCount :22011-05-232011-05-232011-05-23Bibliographically approved