Structure of a surfactant-templated silicate framework in the absence of 3D crystallinity

Niklas Hedin, Robert Graf, Sean C. Christiansen, Christel Gervais, Ryan C. Hayward, Juergen Eckert, Bradley F. Chmelka

Research output: Contribution to journalArticlepeer-review

82 Scopus citations

Abstract

The structure of a novel molecularly ordered two-dimensional (2D) silicate framework in a surfactant-templated mesophase has been established by using a combination of solid-state nuclear magnetic resonance (NMR) spectroscopy, X-ray diffraction, and quantum chemical and empirical force-field modeling. These materials are unusual in their combination of headgroup-directed 2D crystalline framework ordering, zeolite-like ring structures within the layers, and long-range mesoscopic organization without three-dimensional (3D) atomic periodicity. The absence of registry between the silicate sheets, resulting from the liquidlike disorder of the alkyl surfactant chains, has presented significant challenges to the determination of framework structures in these and similar materials lacking 3D crystalline order. Double-quantum 29Si NMR correlation experiments establish the interactions and connectivities between distinct intra-sheet silicon sites from which the structure of the molecularly ordered inorganic framework is determined.

Original languageEnglish
Pages (from-to)9425-9432
Number of pages8
JournalJournal of the American Chemical Society
Volume126
Issue number30
DOIs
StatePublished - Aug 4 2004

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