Mixed-Valence Cobalt(II/III)-Octacyanidotungstate(IV/V) Ferromagnet

作者：Komori Orisaku Keiko; Imoto Kenta; Koide Yoshihiro; Ohkoshi Shin ichi^*

来源：Crystal Growth & Design, 2013, 13(12): 5267-5271.

DOI：10.1021/cg401011d

We report a mixed-valence cobalt(II/III)-octacyanidotungstate(IV/V) magnet, [Co-II(H2O)](2)[Co-III{mu-(R)-1-(4-pyridyl)ethanol}(2)][W-IV(CN)(8)][W-V(CN)(8)]center dot 5H(2)O. Synchrotron-radiation X-ray single crystal structural analysis, infrared spectrum, and density-functional theory (DFT) calculation indicate that this compound has a chiral structure with the P2(1) space group and both Co-II(S = 3/2)-NC-W-V(S = 1/2) and Co-III(S = 0)-NC-W-IV(S = 0) moieties, which are structurally distinguishable in the crystal structure. Magnetic measurements reveal that this compound exhibits ferromagnetism with a Curie temperature of 11 K and a coercive field of 1500 Oe, which is caused by the coexistence of the superexchange interaction in the Co-II-W-V chain and double exchange interaction between the chains.

• 出版日期2013-12