Site‐Specific Iron Substitution in STA‐28, a Large Pore Aluminophosphate Zeotype Prepared by Using 1,10‐Phenanthrolines as Framework‐Bound Templates

An AlPO4 zeotype has been prepared using the aromatic diamine 1,10‐phenanthroline and some of its methylated analogues as templates. In each case the two template N atoms bind to a specific framework Al site to expand its coordination to the unusual octahedral AlO4N2 environment. Furthermore, using...

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Published inAngewandte Chemie Vol. 132; no. 35; pp. 15298 - 15302
Main Authors Watts, Abigail E., Lozinska, Magdalena M., Slawin, Alexandra M. Z., Mayoral, Alvaro, Dawson, Daniel M., Ashbrook, Sharon E., Bode, Bela E., Dugulan, A. Iulian, Shannon, Mervyn D., Cox, Paul A., Turrina, Alessandro, Wright, Paul A.
Format Journal Article
LanguageEnglish
Published Weinheim Wiley Subscription Services, Inc 24.08.2020
Subjects
ADF STEM
aluminophosphate
Aluminum phosphate
Chemistry
Crystallography
Diamines
framework-bound template
Iron
iron substitution
Organic chemistry
Scanning transmission electron microscopy
Transmission electron microscopy
zeotype
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Summary:An AlPO4 zeotype has been prepared using the aromatic diamine 1,10‐phenanthroline and some of its methylated analogues as templates. In each case the two template N atoms bind to a specific framework Al site to expand its coordination to the unusual octahedral AlO4N2 environment. Furthermore, using this framework‐bound template, Fe atoms can be included selectively at this site in the framework by direct synthesis, as confirmed by annular dark field scanning transmission electron microscopy and Rietveld refinement. Calcination removes the organic molecules to give large pore framework solids, with BET surface areas up to 540 m2 g−1 and two perpendicular sets of channels that intersect to give pore space connected by 12‐ring openings along all crystallographic directions. The aromatic diamine 1,10‐phenanthroline acts as a framework‐bound template for the large‐pore aluminophosphate zeotype STA‐28 and can be used to introduce Fe for Al at a single crystallographic site, as verified by Rietveld refinement and annular dark field scanning transmission electron microscopy. Removal of the template leaves a crystalline microporous solid with accessible iron cations.
ISSN:0044-8249
1521-3757
DOI:10.1002/ange.202005558