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

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.