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HPM‐14: A New Germanosilicate Zeolite with Interconnected Extra‐Large Pores Plus Odd‐Membered and Small Pores **
Author(s) -
Gao Zihao Rei,
Li Jian,
Lin Cong,
Mayoral Alvaro,
Sun Junliang,
Camblor Miguel A.
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202011801
Subject(s) - stacking , crystallography , monoclinic crystal system , zeolite , tetrahedron , ring (chemistry) , materials science , transmission electron microscopy , diffraction , scanning transmission electron microscopy , nanopore , silicon , electron diffraction , germanium , powder diffraction , chemistry , crystal structure , nanotechnology , optics , catalysis , physics , organic chemistry , metallurgy
HPM‐14 is a new extra‐large pore zeolite synthesized using imidazolium‐based organic structure‐directing agents (SDAs), fluoride anions, and germanium and silicon as tetrahedral components of the framework. Owing to the presence of stacking disorder, the structure elucidation of HPM‐14 was challenging, and different techniques were necessary to clarify the details of the structure and to understand the nature of the disorder. The structure has been solved by three‐dimensional electron‐diffraction technique (3D ED) and consists of an intergrowth of two polymorphs possessing a three‐dimensional channel system, including an extra‐large pore opened through windows made up of sixteen tetrahedral atoms (16‐membered ring, 16MR) as well as two additional sets of odd‐membered (9MR) and small (8MR) pores. The intergrowth has been studied by scanning transmission electron microscopy (C s ‐STEM) and powder X‐ray diffraction simulations (DIFFaX), which show a large predominance of the monoclinic polymorph A.