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Al-27/P-31 solid-state nmr structural investigations of AlPO4-5 molecular sieve

TitleAl-27/P-31 solid-state nmr structural investigations of AlPO4-5 molecular sieve
Publication TypeJournal Article
Year of Publication1996
AuthorsFyfe, CA, Wongmoon, KC, Huang, Y
Date PublishedJan
Type of ArticleArticle
ISBN Number0144-2449
KeywordsAl-27/P-31 solid-state nmr connectivity experiments, AlPO4-5, FRAMEWORK, NMR, NUCLEI, octahedral aluminum, QUADRUPOLAR, VPI-5

Al-27/P-31 solid-state n.m.r. connectivity experiments were used to investigate the structure of the molecular sieve AlPO4-5 hydrated with D2O. Hydration with D2O resulted in an increased efficiency of coherence transfer from octahedral Al-27 to P-31 compared with hydration with H2O. The experiments prove directly that both the tetrahedral aluminum and the octahedral aluminum formed upon hydration are connected to phosphorus in the framework. The two-dimensional Al-27 –> P-31 transferred-echo double-resonance and cross-polarization experiments show a downfield offset of the octahedral Al-27 correlation from the tetrahedral Al-27 correlation, consistent with the growth of a downfield shoulder on the P-31 resonance as water is incorporated into the lattice.

URL<Go to ISI>://A1996TM03700009