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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

DOI: 10.1021/acs.chemmater.6b04892 DOI Help

Authors: Alessandro Turrina (University of St Andrews) , Raquel Garcia (Johnson Matthey Technology Centre) , Abigail E. Watts (University of St Andrews) , Heather F. Greer (University of St Andrews) , Jonathan Bradley (Johnson Matthey Technology Centre) , Wuzong Zhou (University of St Andrews) , Paul A. Cox (University of Portsmouth) , Mervyn D. Shannon (Johnson Matthey Technology Centre) , Alvaro Mayoral (Universidad de Zaragoza) , John L. Casci (Johnson Matthey Technology Centre) , Paul A. Wright (University of St Andrews)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Chemistry Of Materials

State: Published (Approved)
Published: February 2017
Diamond Proposal Number(s): 11830

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.

Subject Areas: Chemistry

Instruments: I11-High Resolution Powder Diffraction

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