Crystals (Nov 2018)

Synthesis, Structure, and Photomagnetic Properties of a Hydrogen-Bonded Lattice of [Fe(bpp)<sub>2</sub>]<sup>2+</sup> Spin-Crossover Complexes and Nicotinate Anions

  • Verónica Jornet-Mollá,
  • Carlos Giménez-Saiz,
  • Francisco M. Romero

DOI
https://doi.org/10.3390/cryst8110439
Journal volume & issue
Vol. 8, no. 11
p. 439

Abstract

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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.

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