2017
DOI: 10.1021/acs.chemmater.6b04892
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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

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 2 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 mem… Show more

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Cited by 37 publications
(31 citation statements)
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“…In ADF mode, the inner collection angle is smaller than in HAADF mode, 15 mrad versus 70 mrad, more electrons are collected, and, therefore, the contrast of the experimental images was increased. This technique is particularly useful to image crystalline frameworks, including even the location of light compounds . Although it is still a dark‐field image affected by the atomic number, it is less affected by this parameter than in HAADF mode in which it contains more diffraction effects.…”
Section: Resultsmentioning
confidence: 99%
“…In ADF mode, the inner collection angle is smaller than in HAADF mode, 15 mrad versus 70 mrad, more electrons are collected, and, therefore, the contrast of the experimental images was increased. This technique is particularly useful to image crystalline frameworks, including even the location of light compounds . Although it is still a dark‐field image affected by the atomic number, it is less affected by this parameter than in HAADF mode in which it contains more diffraction effects.…”
Section: Resultsmentioning
confidence: 99%
“…The two additional frameworks are the SFW and the SWY frameworks, which correspond to two silicoaluminophosphates that were recently synthesised by Wright and co-workers (STA-18 -SFW and STA-20 -SWY). 61,62 Like all other structures, these two frameworks were optimised in pure-AlPO 4 composition. The setup of the structure optimisations was chosen on the basis of previous benchmarking work, 63,64 using the CASTEP code with on-the-fly-generated ultrasoft pseudopotentials, 65 the PBE functional 66 in conjunction with the dispersion correction devised by Tkatchenko and Scheffler, 67 and an energy cutoff of 700 eV.…”
Section: Computational Detailsmentioning
confidence: 99%
“…[7] Forc omparison, Figure 1c shows STA-20 (SWY framework), the most recent silicoaluminophosphate with ABC-6 structure,w hich was characterized by spherical aberration (C s )c orrected STEM together with the unit cell schematic model, representing another excellent example of stacking modulation characterization by EM. [8] Qing Zhang received her PhD degree in Laser Optics in 2011 from Institute of Physics in Chinese Academy of Sciences. After ap ostdoctoral fellowshipa tt he Deutsches Elektronen-Synchrotron (DESY) in Germany,s he joined ShanghaiTech University as ar esearch assistant in 2018.…”
Section: Introductionmentioning
confidence: 99%
“…Reproducedw ith permission. [8] Copyright 2017, AmericanC hemical Society.6 Rs, 8Rs and D6Rs are marked by green dots, blue dots and red rectangles, respectively.…”
Section: Introductionmentioning
confidence: 99%