Double rotation27Al NMR in molecular sieves

Autor:	M Kovalakova, Pierre Grobet
Rok vydání:	1996
Předmět:	NMR spectra database Solid-state physics Aluminosilicate Carbon-13 NMR satellite Chemistry Magic angle spinning Analytical chemistry Anisotropy Molecular sieve Atomic and Molecular Physics and Optics Doppler broadening
Zdroj:	Applied Magnetic Resonance. 10:447-476
ISSN:	1613-7507 0937-9347
DOI:	10.1007/bf03162599
Popis:	Although high-resolution NMR spectra can be obtained in solids, the use of27Al NMR to investigate the structure of aluminosilicate and aluminophosphate molecular sieves has been severely limited because anisotropic second-order quadrupolar interactions, responsible for spectral broadening, cannot be eliminated by conventional magic angle spinning (MAS) or multiple pulse techniques. Here we give the principles of the double rotation (DOR) NMR technique which can remove not only the first-order broadenings but also the second-order broadenings in the NMR spectra of quadrupolar nuclei in solids. High-resolution27Al NMR using DOR is capable of resolving discrete framework aluminum sites in aluminophosphate molecular sieves, permitting quantitative investigation of site-specific adsorbate-host interactions, and of discriminating different aluminum species in zeolites.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3c82421084ff88a0397e93520dd38f37 https://doi.org/10.1007/bf03162599 Zobrazit plný text záznamu Full text from SpringerLink