Guest induced hysteretic tristability in 3D pillared Hofmann-type microporous metal–organic frameworks

Herein we report the synthesis, isolation and structural characterization of hybrid microporous Hofmann-like spin crossover polymers with the molecular formula {Fe(C4H4N2)[M(CN)4]}·(C4H4N2)·1.2H2O where M = Pt(II) (1), Pd(II) (2). Magnetic susceptibility studies showed well-resolved hysteretic three-step for 1 and two-step for 2 thermally induced spin transitions.