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Precise electrochemical control of ferromagnetism in a cyanide-bridged bimetallic coordination polymer. | LitMetric

AI Article Synopsis

  • Magnetic coordination polymers can be engineered to control their magnetism based on external stimuli, particularly through the introduction of lithium ions.
  • The study focuses on a specific cyanide-bridged bimetallic coordination polymer, NiFe-PBA, demonstrating that lithium ion insertion and extraction lead to reversible changes in the magnetic properties, specifically affecting the transition temperature (T(C)).
  • As lithium ions are added, the transition temperature T(C) decreases due to the conversion of paramagnetic Fe(3+) ions to diamagnetic Fe(2+), while removing lithium ions reverses this effect, restoring the original magnetic characteristics.

Article Abstract

Magnetic coordination polymers can exhibit controllable magnetism by introducing responsiveness to external stimuli. This report describes the precise control of magnetism of a cyanide-bridged bimetallic coordination polymer (Prussian blue analogue: PBA) through use of an electrochemical quantitative Li ion titration technique, i.e., the galvanostatic intermittent titration technique (GITT). K(0.2)Ni[Fe(CN)(6)](0.7)·4.7H(2)O (NiFe-PBA) shows Li ion insertion/extraction reversibly accompanied with reversible Fe(3+)/Fe(2+) reduction/oxidation. When Li ion is inserted quantitatively into NiFe-PBA, the ferromagnetic transition temperature T(C) gradually decreases due to reduction of paramagnetic Fe(3+) to diamagnetic Fe(2+), and the ferromagnetic transition is completely suppressed for Li(0.6)(NiFe-PBA). On the other hand, T(C) increases continuously as Li ion is extracted due to oxidation of diamagnetic Fe(2+) to paramagnetic Fe(3+), and the ferromagnetic transition is nearly recovered for Li(0)(NiFe-PBA). Furthermore, the plots of T(C) as a function of the amount of inserted/extracted Li ion x are well consistent with the theoretical values calculated by the molecular-field approximation.

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Source
http://dx.doi.org/10.1021/ic301361hDOI Listing

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