Abstract
AbstractStructural, thermal, magnetic and solvent‐exchange properties of the spin crossover compound [Fe(bpp)2][Cr(bpy)(ox)2]2 containing paramagnetic anions are given. This complex salt 1 crystallises as a dihydrate with two inequivalent (high‐spin and low‐spin) FeII sites. The dehydrated compound is a spin‐crossover material with T1/2↑ = 369 K and T1/2↓ = 353 K. Rehydration takes place without loss of crystallinity, yielding a polymorph (2) with 100 % high‐spin FeII sites. The different high‐spin fractions in 1 and 2 have been correlated to structural changes in the FeII second coordination sphere. The magnetic response to the presence of different sorbed molecules has also been explored. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
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