Anion-dependent spin crossover in solution for an iron(ii) complex of a 1H-pyrazolyl ligand

Abstract

The spin-crossover equilibrium midpoint temperature (T1/2) in [Fe(3-bpp)2]X2 (3-bpp = 2,6-di{pyrazol-3-yl}pyridine) varies from 259 K when X− = BPh4− to 277 K when X− = Br−, at 10 mM concentrations in an acetone–water solvent mixture.