Evidence map›Paper›PMID 40861984›Full record

ArticleRSC advances2025

Molecular fluctuations in mixed-metal MOF-74: influence of the metal composition.

Arda Yildirim, Tabea C V Haug, Michael Fröba, Patrick Huber, Andreas Schönhals

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Article in RSC advances, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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1 · What the graph read from it

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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

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3 · Its place in the literature

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4 · The record

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5 · Who and what money

Authors and funding

5 authors.

Arda YildirimBundesanstalt für Materialforschung und -prüfung (BAM) Unter Den Eichen 87 12205 Berlin Germany Andreas.Schoenhals@bam.de +49 30/8104-73384 +49 30/8104-3384.
Tabea C V HaugInstitute of Inorganic and Applied Chemistry, University of Hamburg Martin-Luther-King-Platz 6 20146 Hamburg Germany.
Michael FröbaInstitute of Inorganic and Applied Chemistry, University of Hamburg Martin-Luther-King-Platz 6 20146 Hamburg Germany.
Patrick HuberInstitute for Materials and X-ray Physics, Hamburg University of Technology Denickestr. 17 21073 Hamburg Germany.ORCID https://orcid.org/0000-0002-2126-9100
Andreas SchönhalsBundesanstalt für Materialforschung und -prüfung (BAM) Unter Den Eichen 87 12205 Berlin Germany Andreas.Schoenhals@bam.de +49 30/8104-73384 +49 30/8104-3384.ORCID https://orcid.org/0000-0003-4330-9107

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

A selected series of metal-organic frameworks M-MOF-74 (M = Mg, Co, Ni) and mixed metal MM-MOF-74 (Mg/Co or Mg/Ni) with different compositions of metal atoms have been prepared and further investigated by broadband dielectric spectroscopy (BDS) in a wide temperature range. The dielectric spectra show at least two relaxation processes. Process-A is observed only for the Ni-containing MOFs and is attributed to localized fluctuations of the metal oxide corners. Relaxation processes-B and -C are observed for all prepared MOFs, except that process-B is not observed for Ni-MOF-74. Large-angle fluctuations such as free rotations of the linkers can be excluded due to the structure of MOF-74, but small-angle fluctuations such as torsions are possible. According to numerical simulations carried out for MOF-74, process-B can be attributed to inward and outward fluctuations of the linkers relative to the pore center. Process-C is related to small-angle rotational fluctuations of the linker together with co-rotations of the metal nodes. The latter interpretation is supported by the dependence of the activation energy of the relaxation rate of process-C on the metal composition of the MOFs, which is discussed in terms of the bond lengths between the metal atoms and the linker which decrease in the sequence Mg, Co and Ni.

Identifiers

PMID40861984
PMCPMC12376766

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