Degradation paths of manganese-based MOF materials in a model oxidative environment: a computational study

Elena Khramenkova, Mikhail Polynskii, Alexandr V. Vinogradov, Evgeny Pidko

    Research output: Contribution to journalArticleScientificpeer-review

    3 Citations (Scopus)
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    Abstract

    Stability is the key property of functional materials. In this work we investigate computationally the degradative potential of a model Mn-BTC (BTC = benzene-1,3,5-tricarboxylate) metal–organic framework (MOF) building block in aqueous solutions under oxidative conditions. Model density functional theory calculations have shown that the direct hydrolysis of the Mn-containing moieties is more difficult than their decomposition via oxidation-induced paths. While the interaction with H2O2 species is of non-covalent nature and requires O–O-bond breaking to initiate Mn-center oxidation, open-shell O2 species readily oxidize radical Mn-centers and form bonds of σ-, π-, or δ-symmetry with the metal. The oxidative transformations of di-Mn paddle-wheel carboxylate structure-forming units are accompanied with substantial distortions of the coordination polyhedra that, together with the increased Lewis acidity of the oxidized metal centers, facilitates the hydrolysis leading to the degradation of the structure at a larger scale. Whereas such a mechanism is expected to hamper the catalytic applications of such Mn-MOFs, the associated structural response to oxidizing and radical species can create a basis for the construction of Mn-MOF-based drug delivery systems with increased bio-compatibility.
    Original languageEnglish
    Pages (from-to)20785-20795
    JournalPhysical Chemistry Chemical Physics
    Volume20
    Issue number32
    DOIs
    Publication statusPublished - 2018

    Keywords

    • OA-Fund TU Delft

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