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Sonocrystallization as an Efficient Way to Control Size, Morphology and Purity of Coordination Compounds Microcrystallites: Application to Single-Chain Magnets

preprint
submitted on 10.04.2020 and posted on 13.04.2020 by Quentin Evrard, Felix Houard, Carole Daiguebonne, guillaume calvez, yan suffren, olivier guillou, Matteo Mannini, Kevin Bernot

Size, morphology and purity control of coordination compounds powders is a key stage for their conversion into materials and devices. In particular, surface science techniques require highly pure bulk materials with a narrow crystallite‑size distribution together with straightforward, scalable and reproducible crystallization procedures. In this work we demonstrate how sonocrystallization, i.e. application of ultrasounds during the crystallization process, can afford, very quickly, powders made of crystallites with controlled size, morphology and purity. We show that this process drastically diminishes the crystallite‑size distribution (low Polydispersity Indexes, PDI) and crystallite aspect ratio. By comparing sonicated samples with various silent crystallization conditions, we unambiguously show that the improvement of the crystallite morphologies and size‑distribution is not due to any thermal effect but to the sonication of the crystallizing media. The application of sonocrystallization on crystallization batches of Single‑Chain Magnets (SCM) maintains SCMs chemical integrity together with their original magnetic behavior. Moreover, luminescent measurements show that sonocrystallization induces an efficient micromixing that drastically enhances the purity of the SCMs powders. We thus propose that sonocrystallization, which is already used on organic or MOF compounds, can be applied to (magnetic) coordination compounds to readily afford bulk powders for characterization or shaping techniques that require pure, morphology‑ and crystallite‑size‑controlled powder samples.


Funding

INSA Rennes

CNRS PICS FloRennes

MIUR-Italy "Progetto Dipartimenti di Eccelenza"

Region Bretagne "Boost'ERC"

Institut Universitaire de France

History

Email Address of Submitting Author

kevin.bernot@insa-rennes.fr

Institution

Univ Rennes, INSA Rennes, CNRS, ISCR, UMR 6226, F 35000 Rennes (France)

Country

France

ORCID For Submitting Author

0000-0001-8337-6246

Declaration of Conflict of Interest

none

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