Reversible three equal-step spin crossover in an iron(ii) Hofmann-type metal–organic framework

Abstract

A novel bent ligand-pillared three-dimensional Hofmann-type metal–organic framework, [Fe^II(Hbpt)Pt(CN)₄]·1/2Hbpt·1/2CH₃OH·5/2H₂O [1, Hbpt = 4,4′-(1H-1,2,4-triazole-3,5-diyl) dipyridine], was synthesized and crystallographically and magnetically characterized, which showed incomplete three-step spin-crossover behavior with a reversible three equal-step sequence of HS^1.00 ↔ HS^0.75LS^0.25 ↔ HS^0.5LS^0.5 ↔ HS^0.25LS^0.75.