Isostructural iron(iii) spin crossover complexes with a tridentate Schiff base-like ligand: X-ray structures and magnetic properties.

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Here we present two isostructural iron(iii) spin crossover complexes with the same tridentate ligand and perchlorate or tetrafluoroborate as counter ion. Single crystal X-ray structures in the high spin and low spin state were obtained for both complexes. An abrupt spin transition above 100 K is observed with the transition temperature depending on the size of the anion.