Hydrogen-bonded 2D network structure and abrupt spin transition with thermal hysteresis of iron(III) complexes [Fe-III(Him)(2) (3-MeOsalen)]center dot H2OEtOH center dot X (Him = imidazole, 3-MeOsalen = N,N '-bis (3-methoxysalicylidene)ethylenediaminato, and X = PF6, AsF6, SbF6)

Spin crossover (SCO) iron(III) complexes exhibiting thermal hysteresis, [Fe-III(Him)(2)(3-MeOsalen)]center dot H2O center dot EtOH center dot X (Him = imidazole, 3-MeOsalen = N, N'-bis(3-methoxysalicylidene) ethylenediaminato, and X = PF6, AsF6, SbF6), were synthesized in ethanol. The FeIII ion has an octahedral coordination geometry with N2O2 donor atoms of the planar tetradentate ligand (3-MeOsalen) and two nitrogen atoms of two imidazoles at the axial positions. Through H2O and EtOH the complex-cations are assembled into a hydrogen-bonded 2D network structure and the anion X is accommodated in the void of the 2D network. The temperature dependences of the magnetic susceptibilities revealed an abrupt and two-step spin transition with thermal hysteresis for the PF6 and AsF6 salts. (C) 2015 Elsevier B.V. All rights reserved.