Daro Nathalie, Moulet Lucie, Penin Nicolas, Paradis Nicolas, Létard Jean-François, Lebraud Eric, Buffière Sonia, Chastanet Guillaume, Guionneau Philippe
CNRS, University of Bordeaux, ICMCB, UPR9048, 87 Avenue du Docteur Schweitzer, F-33600 Pessac, France.
Materials (Basel). 2017 Jan 11;10(1):60. doi: 10.3390/ma10010060.
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.
基于自旋交叉（SCO）的三唑基配位聚合物可通过胶束技术合成，该技术几乎总是会生成棒状纳米颗粒。为了显著获得新的形态，我们在此探索喷雾干燥（SD）法制备SCO材料的潜力。研究了三种SCO配位聚合物和一种单核配合物。在所有情况下，SD法得到的颗粒都明确显示出自旋交叉现象。后者的特征总是与参考材料不同，从某种意义上说，自旋交叉现象更加渐进且不完全，这与通过SD法获得的粉末结晶度较差相符合。对于配位聚合物，颗粒优先呈球形。有证据表明使用SD法可能会诱导多态性和/或产生新材料。对于单核配合物，SD法能够快速简便地重现著名的块状化合物。这项探索性工作证明了该概念的相关性，并为系统研究所有实验参数以调节SD合成的SCO颗粒的尺寸、形态和性能开辟了道路。
