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In Situ X-ray Diffraction Investigation of the Crystallisation of Perfluorinated CeIV-Based Metal–Organic Frameworks with UiO-66 and MIL-140 Architectures**

Stephen J. I. Shearan Orcid Logo, Jannick Jacobsen, Ferdinando Costantino Orcid Logo, Roberto D'Amato, Dmitri Novikov Orcid Logo, Norbert Stock Orcid Logo, Enrico Andreoli Orcid Logo, Marco Taddei Orcid Logo

Chemistry – A European Journal, Volume: 27, Issue: 21, Pages: 6579 - 6592

Swansea University Authors: Enrico Andreoli Orcid Logo, Marco Taddei Orcid Logo

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DOI (Published version): 10.1002/chem.202005085

Abstract

We report on the results of an in situ synchrotron powder X‐ray diffraction study of the crystallisation in aqueous medium of two recently discovered perfluorinated CeIV‐based metal–organic frameworks (MOFs), analogues of the already well investigated ZrIV‐based UiO‐66 and MIL‐140A, namely, F4_UiO‐6...

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Published in: Chemistry – A European Journal
ISSN: 0947-6539 1521-3765
Published: Wiley 2021
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URI: https://cronfa.swan.ac.uk/Record/cronfa56462
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Abstract: We report on the results of an in situ synchrotron powder X‐ray diffraction study of the crystallisation in aqueous medium of two recently discovered perfluorinated CeIV‐based metal–organic frameworks (MOFs), analogues of the already well investigated ZrIV‐based UiO‐66 and MIL‐140A, namely, F4_UiO‐66(Ce) and F4_MIL‐140A(Ce). The two MOFs were originally obtained in pure form in similar conditions, using ammonium cerium nitrate and tetrafluoroterephthalic acid as reagents, and small variations of the reaction parameters were found to yield mixed phases. Here, we investigate the crystallisation of these compounds, varying parameters such as temperature, amount of the protonation modulator nitric acid and amount of the coordination modulator acetic acid. When only HNO3 is present in the reaction environment, only F4_MIL‐140A(Ce) is obtained. Heating preferentially accelerates nucleation, which becomes rate determining below 57 °C. Upon addition of AcOH to the system, alongside HNO3, mixed‐phased products are obtained. F4_UiO‐66(Ce) is always formed faster, and no interconversion between the two phases occurs. In the case of F4_UiO‐66(Ce), crystal growth is always the rate‐determining step. A higher amount of HNO3 favours the formation of F4_MIL‐140A(Ce), whereas increasing the amount of AcOH favours the formation of F4_UiO‐66(Ce). Based on the in situ results, a new optimised route to achieving a pure, high‐quality F4_MIL‐140A(Ce) phase in mild conditions (60 °C, 1 h) is also identified.
Keywords: cerium; crystallization; in situ X-ray diffraction; kinetics; metal–organic frameworks
College: Faculty of Science and Engineering
Funders: H2020 Marie Skłodowska-Curie Actions. Grant Number: 663830; Horizon 2020 Framework Programme. Grant Number: 730872; European Regional Development Fund. Grant Numbers: FLEXIS, RICE, 80708; Engineering and Physical Sciences Research Council. Grant Number: EP/M028267/1
Issue: 21
Start Page: 6579
End Page: 6592