Synthesis and characterization of a spin crossover iron(ii)-iron(iii) mixed valence supramolecular pseudo-dimer exhibiting chiral recognition, hydrogen bonding, and π-π Interactions

Reaction of iron(ii) and the 3: 1 Schiff base condensate of 5-methylpyrazole-3-carboxaldehyde and tris(2-aminoethyl)amine in air gives a pseudo-dimer complex with a triple helix structure made of Δ-Δ and Λ-Λ pairings of spin crossover iron(ii) and low spin iron(iii) cations that are held together by three π-π and hydrogen bonding interactions.