The spin crossover behavior in dinuclear FeIII complexes is tuned by changing the oxidation state of the bridging bis(dioxolene) ligand, with the mixed-valence form imparting an asymmetric ligand field that drives a two-step interconversion.
Four FeIII complexes of the Hqnal-5-Brq ligand have been characterized, marking them as the first examples of FeIII SCO complexes with a quinoline-substituted Hqnal ligand. The effects of anions and solvents on their SCO properties were assessed.
Tetrahedral Fe(II)-based metal–organic cages represent a distinctive family of spin crossover materials that display tunable magnetic bistability in the solid state under thermal, chemical or photonic stimuli.
Mn(III) complexes with tunable intermolecular interactions were synthesized via a counterion strategy, showing tunable SCO properties.
The influence of dopant molecules on the structure and functionality of spin-crossover materials is surveyed.