Inducing Spin Crossover in Amphiphilic Iron(III) Complexes

Abstract Thermal spin crossover (SCO) was induced in a high‐spin Fe III complex by alkylation of the polyamino ligand backbone. The SCO profile was responsive to chain length with partial crossover observed with C 6 alkylation and full transition upon lengthening to C 12 . No crossover was observed when the backbone was unfunctionalised, and all three complexes were obtained as unsolvated tetrafluoroborate salts.