Room temperature bistability with wide thermal hysteresis in a spin crossover silica nanocomposite

Pierrick Durand; Sébastien Pillet; El-Eulmi Bendeif; Cédric Carteret; Mohamed Bouazaoui; Hicham El Hamzaoui; Bruno Capoen; Lionel Salmon; Sylvie Hébert; Jaafar Ghanbaja; Lionel Aranda; Dominik Schaniel

doi:10.1039/C3TC00546A

Room temperature bistability with wide thermal hysteresis in a spin crossover silica nanocomposite†

Pierrick Durand,^ab Sébastien Pillet,*^ab El-Eulmi Bendeif,^ab Cédric Carteret,^c Mohamed Bouazaoui,^d Hicham El Hamzaoui,^d Bruno Capoen,^d Lionel Salmon,^e Sylvie Hébert,^f Jaafar Ghanbaja,^g Lionel Aranda^h and Dominik Schaniel^ab

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* Corresponding authors

^a Université de Lorraine, CRM2, UMR 7036, Vandoeuvre les Nancy, France
E-mail: sebastien.pillet@crm2.uhp-nancy.fr
Fax: +33 (0)3 83 68 43 00
Tel: +33 (0)3 83 68 48 80

^b CNRS, CRM2, UMR 7036, Vandoeuvre les Nancy, France

^c LCPME, UMR 7564, Université de Lorraine-CNRS, Villers-lès-Nancy, France
E-mail: cedric.carteret@univ-lorraine.fr
Fax: +33 (0)3 83 27 54 44
Tel: +33 (0)3 83 68 52 42

^d Laboratoire de Physique des Lasers, Atomes et Molécules (CNRS, UMR 8523), IRCICA (CNRS, USR 3380), Université Lille 1-Sciences et Technologies, Bâtiment P5, F-59655 Villeneuve d'Ascq Cedex, France

^e Laboratoire de Chimie de Coordination, CNRS and Université de Toulouse (UPS, INP), 205 route de Narbonne, 31077 Toulouse, France
E-mail: lionel.salmon@lcc-toulouse.fr
Fax: +33 (0)561553003
Tel: +33 (0)561333178

^f Laboratoire CRISMAT, UMR6508 CNRS et ENSICAEN, 6 Bd du Maréchal Juin, 14050 Caen Cedex, France

^g CC-MEM, Institut Jean Lamour - Université de Lorraine, Parc de Saurupt - CS 50840, 54011 Nancy Cedex, France

^h Institut Jean Lamour (UMR 7198), Faculté des Sciences, BP 70239, 54506 Vandoeuvre les Nancy, France
E-mail: lionel.aranda@univ-lorraine.fr
Fax: +33 (0)3 83 68 46 11
Tel: +33 (0)3 83 68 46 63

Abstract

Nanocomposites have been processed following a wet-impregnation approach, by confined growth of nanoparticles of the spin crossover complex [Fe(Htrz)₂(trz)](BF₄) within pre-formed transparent mesoporous silica monoliths of well controlled porosity. The obtained materials were studied using numerous characterisation techniques to define the interplay between the porosity of the host matrix, the structure and morphology of the in situ elaborated nanoparticles, and the spin crossover properties of the composite. Transmission electron micrographs show monodisperse spherical nanoparticles of mean diameter 3.2(5) nm, homogeneously distributed within the pores of the silica monolith. Magnetic measurements, temperature dependent infrared, Raman, and Mössbauer spectroscopy confirm the spin transition behaviour of the nanocomposite, with a room temperature bistability and 65 K wide hysteresis.

Journal of Materials Chemistry C

Room temperature bistability with wide thermal hysteresis in a spin crossover silica nanocomposite†

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Room temperature bistability with wide thermal hysteresis in a spin crossover silica nanocomposite

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