Journal Article

IMPULSE-2021-00015

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Template‐mediated control over polymorphism in the vapor‐assisted formation of zeolitic imidazolate framework powders and films

Tu, M. (Corresponding author) ; Kravchenko, D. E. ; Xia, B. ; Rubio-Giménez, V. ; Wauteraerts, N. ; Verbeke, R. ; Vankelecom, I. ; Stassin, T. ; Egger, W.MLZ* ; Dickmann, M.MLZ* ; Amenitsch, H. ; Ameloot, R.

2021
Wiley-VCH Weinheim

Please use a persistent id in citations: doi:10.1002/anie.202014791

Abstract: The landscape of possible polymorphs for some metal–organic frameworks (MOFs) can pose a challenge for controlling the outcome of their syntheses. Demonstrated here is the use of a template to control in the vapor-assisted formation of zeolitic imidazolate framework (ZIF) powders and thin films. Introducing a small amount of either ethanol or dimethylformamide vapor during the reaction between ZnO and 4,5-dichloroimidazole vapor results in the formation of the porous ZIF-71 phase, whereas other conditions lead to the formation of the dense ZIF-72 phase or amorphous materials. Time-resolved in situ small-angle X-ray scattering reveals that the porous phase is metastable and can be transformed into its dense polymorph. This transformation is avoided through the introduction of template vapor. The porosity of the resulting ZIF powders and films was studied by N2 and Kr physisorption, as well as positron annihilation lifetime spectroscopy. The templating principle was demonstrated for other members of the ZIF family as well, including the ZIF-7 series, ZIF-8_Cl, and ZIF-8_Br.

Keyword(s): Chemical Reactions and Advanced Materials (1st) ; Materials Science (2nd)

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Contributing Institute(s):

1. NEPOMUC (NEPOMUC)

Experiment(s):

1. NEPOMUC: Neutron induced positron source munich (SR11)

Appears in the scientific report 2021

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Database coverage:
; Chemical Reactions ; Clarivate Analytics Master Journal List ; Current Contents - Life Sciences ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 10 ; Index Chemicus ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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