Guest induced hysteretic tristability in 3D pillared Hofmann-type microporous metal-organic frameworksAll authors have given approval to the final version of the manuscript.Electronic supplementary information (ESI) available: Experimental and synthetic methods, crystallographic data, thermogravimetric analysis (TGA) and infrared (IR) spectra, magnetic data, tables and figures. CCDC 1472612 and 1472613. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c7nj0239

Herein we report the synthesis, isolation and structural characterization of hybrid microporous Hofmann-like spin crossover polymers with the molecular formula {Fe(C 4 H 4 N 2 )[M(CN) 4 ]}·(C 4 H 4 N 2 )·1.2H 2 O 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. Hofmann-type SCO coordination polymers with the formula {Fe(C 4 H 4 N 2 )[M(CN) 4 ]}·(C 4 H 4 N 2 )·1.2H 2 O, where M = Pt( ii ), Pd( ii ) displaying well-resolved hysteretic multistep thermally induced spin transition.