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STA-20: an ABC-6 zeotype structure prepared by co-templating and solved via a hypothetical structure database and STEM-ADF imaging

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Author(s)

Alessandro Turrina, Raquel Garcia, Abigail E. Watts, Heather F. Greer, Jonathan Bradley, Wuzong Zhou, Paul A. Cox, Mervyn D. Shannon, Alvaro Mayoral, John Casci, Paul A. Wright

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Abstract

A microporous silicoaluminophosphate with a novel topology type, STA-20, has been prepared via a dual templating method using hexamethylene bisdiazabicyclooctane (diDABCO-C6) and trimethylamine as co-templates. Its structure has been solved and confirmed using a multi-technique approach that included the use of a hypothetical zeolite database to obtain a candidate starting structure, followed by scanning transmission electron microscopy with annular dark field imaging and Rietveld refinement. STA-20 is a member of the ABC-6 family of zeotype structures. The structure has trigonal symmetry, P-31c, with a = 13.15497(18) Å and c = 30.5833(4) Å in the calcined form. It has a 12-layer stacking sequence of 6-rings (6Rs), AABAABAACAAC(A), which contains single and double 6R units. As well as d6r, can and gme cages, STA-20 possesses the longest cage observed in an ordered ABC-6 material, giving a 3D-connected pore system limited by 8R windows. Models for the location of the templates within cages of the framework were obtained by combining elemental analysis, 13C MAS NMR, computer modelling and Rietveld refinement.
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Original languageEnglish
Pages (from-to)2180-2190
Number of pages11
JournalChemistry of Materials
Volume29
Issue number5
Early online date5 Feb 2017
DOIs
StatePublished - 14 Mar 2017

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