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

Yoshifumi Mizuno, Masashi Okubo, Koichi Kagesawa, Daisuke Asakura, Tetsuichi Kudo, Haoshen Zhou, Katsuyoshi Oh-Ishi, Atsushi Okazawa, Norimichi Kojima

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

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 0.2Ni[Fe(CN) 6] 0.74.7H 2O (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.

Original languageEnglish
Pages (from-to)10311-10316
Number of pages6
JournalInorganic chemistry
Volume51
Issue number19
DOIs
Publication statusPublished - 2012 Oct 1

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

Fingerprint Dive into the research topics of 'Precise electrochemical control of ferromagnetism in a cyanide-bridged bimetallic coordination polymer'. Together they form a unique fingerprint.

Cite this