Materials with hysteretic multi-step spin-crossover (SCO) have potential application in high-order data storage. Here, an unprecedented hysteretic four-step SCO behavior with the sequence of LS↔HS LS ↔HS LS ↔ HS LS ↔HS is found in a three-dimensional (3D) Hofmann-type metal-organic framework (MOF), which is evidenced by magnetic, differential scanning calorimetry, and crystal data. Further experiments involving guest exchange leads to the first reversible modulation of four-, two-, and one-stepped SCO behaviors, which provides a new strategy for developing multi-step SCO materials.
An aggregation-induced emission (AIE) active probe (L) displayed TURN-ON fluorescence response toward Al(3+) under physiological conditions and in HeLa cells. The L-Al(3+) ensemble could subsequently facilitate tracking of interaction with DNA in solution.
Materials with hysteretic multi‐step spin‐crossover (SCO) have potential application in high‐order data storage. Here, an unprecedented hysteretic four‐step SCO behavior with the sequence of LS↔HS0.25LS0.75↔HS0.5LS0.5↔ HS0.75LS0.25↔HS is found in a three‐dimensional (3D) Hofmann‐type metal–organic framework (MOF), which is evidenced by magnetic, differential scanning calorimetry, and crystal data. Further experiments involving guest exchange leads to the first reversible modulation of four‐, two‐, and one‐stepped SCO behaviors, which provides a new strategy for developing multi‐step SCO materials.
An unprecedented two-step spin-crossover behavior with the sequence of γ =1↔γ =3/4↔γ =1/4 was observed in two-dimensional Hofmann type coordination polymer [Fe(isoq) {Ag(CN) } ] (isoq=isoquinoline), which resulted from three crystallographically inequivalent Fe sites with distinct transition temperatures.
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