Reversible Single-Crystal-to-Single-Crystal Transformation from Achiral Antiferromagnetic Hexanuclears to a Chiral Ferrimagnetic Double Zigzag Chain

Abstract

A reversible single-crystal-to-single-crystal transformation from hexanuclear clusters to a one-dimensional double-zigzag chain was established. With the reversible polymerization, the chirality and magnetic interactions are switched between achiral and chiral and between antiferromagnetic in hexanuclear clusters and ferrimagnetic in chains, respectively.

Charge‐Transfer Phase Transition of a Cyanide‐Bridged FeII/FeIII Coordination Polymer

“…[26][27][28] [29,30] In ac ontinuing effort to obtain switchable cyanometalates, cyanide-bridged iron complexes with either Fe III -CN-Fe II or Fe II -CN-Fe III units have been reported. [31][32][33][34][35][36] Therefore,appropriate control of the redox potential of iron ions in these complexes might allow for the transformation of Fe III -CN-Fe II into Fe II -CN-Fe III through aM MCT phase transition in the simplest FeFe Prussian blue analogues.…”

Combined solid state NMR and ONIOM studies of reversible crystalline phase reaction for nickel coordination compounds

“…Chen and coworkers have proved that such conversion can lead to formation of chiral three-dimensional metal-organic framework [21]. Zhang et al have recently reported that reversible SC-SC transformation related with guests migration (water and acetonitrile in cited case) which involves changes in the symmetry, lattice parameters and molecular stacking arrangements can be followed by thermogravimetric analysis (TGA) and powder X-ray diffraction (XRD) [22]. Harris and coworkers have showed that the solid-state NMR is highly informative in study of the interaction of water with organic compounds [23].…”

Charge‐Transfer Phase Transition of a Cyanide‐Bridged FeII/FeIII Coordination Polymer

“…The prototypical compound, Prussian blue (Fe III 4 [Fe II (CN) 6 ] 3 ⋅ x H 2 O), does not exhibit MMCT phase transitions; its electrochemical and/or chemical switching has only been demonstrated in Prussian white (Everitt's salt; Fe II ‐CN‐Fe II units) and Prussian brown (Fe III ‐CN‐Fe III units) through a Fe 3+/2+ redox reaction in the solid state . In a continuing effort to obtain switchable cyanometalates, cyanide‐bridged iron complexes with either Fe III ‐CN‐Fe II or Fe II ‐CN‐Fe III units have been reported . Therefore, appropriate control of the redox potential of iron ions in these complexes might allow for the transformation of Fe III ‐CN‐Fe II into Fe II ‐CN‐Fe III through a MMCT phase transition in the simplest FeFe Prussian blue analogues.…”