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Materials 2017, 10(1), 60;

Spray-Drying to Get Spin-Crossover Materials

CNRS, University of Bordeaux, ICMCB, UPR9048, 87 Avenue du Docteur Schweitzer, F-33600 Pessac, France
Author to whom correspondence should be addressed.
Academic Editor: Wolfgang Linert
Received: 15 December 2016 / Revised: 3 January 2017 / Accepted: 5 January 2017 / Published: 11 January 2017
(This article belongs to the Special Issue Advances in Molecular Magnets and related Phenomena)
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Spin-crossover (SCO) triazole-based coordination polymers can be synthesized by micelle techniques, which almost always lead to rod-shaped nanoparticles. In order to notably reach new morphologies, we explore here the potentiality of the spray-drying (SD) method to get SCO materials. Three SCO coordination polymers and a mononuclear complex are investigated. In all cases, the SD method obtains particles definitely showing SCO. The features of the latter are yet always different from those of the referenced materials, in the sense that SCO is more gradual and incomplete, in adequacy with the poor crystallinity of the powders obtained by SD. In the case of coordination polymers, the particles are preferentially spherical. Indications of possible polymorphism and/or new materials induced by the use of the SD method are evidenced. In the case of the mononuclear complex, the SD method has allowed reproducing, in a quick and easy way, the well-known bulk compound. This exploratory work demonstrates the relevance of the concept and opens the way to a systematic scrutiny of all the experimental parameters to tune the size, morphology, and properties of the SD-synthesized SCO particles. View Full-Text
Keywords: spin crossover; spray-drying; nanoparticles; iron; triazole; molecular switch; crystallite spin crossover; spray-drying; nanoparticles; iron; triazole; molecular switch; crystallite

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Daro, N.; Moulet, L.; Penin, N.; Paradis, N.; Létard, J.-F.; Lebraud, E.; Buffière, S.; Chastanet, G.; Guionneau, P. Spray-Drying to Get Spin-Crossover Materials. Materials 2017, 10, 60.

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