Abstract
In this paper, we report on the synthesis, crystal structure, and photomagnetic properties of the spin-crossover salt of formula [Fe(bpp)2](C6H4NO2)2·4H2O (1·4H2O) (bpp = 2,6-bis(pyrazol-3-yl)pyridine; C6H4NO2− = nicotinate anion). This compound exhibits a 3D supramolecular architecture built from hydrogen bonds between iron(II) complexes, nicotinate anions, and water molecules. As synthesized, the hydrated material is low-spin and desolvation triggers a low-spin (LS) to high-spin (HS) transformation. Anhydrous phase 1 undergoes a partial spin crossover (T1/2= 281 K) and a LS to HS photomagnetic conversion with a T(LIESST) value of 56 K.
Highlights
Switching magnetic materials represent a prominent avenue for the construction of multifunctional materials with several applications in different fields, such as chemical and pressure sensing [1], data storage [2], and spintronics [3,4]
In order to avoid the inclusion of undesired counterions in the spin-crossover network, it is necessary to obtain a solution without any other hydrogen-bond acceptors that could be in competition with the nicotinate anions
TG analysis of 1·4H2 O under nitrogen atmosphere (Figure S2) was performed in order to determine at which temperature the dehydration of the sample starts and the temperature range of the stability of the compound
Summary
Switching magnetic materials represent a prominent avenue for the construction of multifunctional materials with several applications in different fields, such as chemical and pressure sensing [1], data storage [2], and spintronics [3,4]. The most studied spin-crossover (SCO) centres are based on iron(II) complexes that exhibit labile electronic configurations switchable between 1 A1 low-spin (LS; S = 0) and 5 T2 high-spin (HS; S = 2) states as a consequence of a given external perturbation, such as light irradiation, variation of temperature and/or pressure [5,6,7,8,9,10,11]. The response to these external stimuli leads to different changes in magnetism, colour, and structure. The appearance of hysteresis and cooperativity in a solid system can be achieved when the geometrical distortion is propagated to the whole framework, providing the material with a bistable character
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