3 nm-wide Cyanometallate Fe-Co Tape Exhibiting Single-Chain Magnet Behavior
INORGANIC CHEMISTRY（2024）
摘要
Treatment of Co(OTf)(2)6H(2)O, Li[(pzTp)Fe-III(CN)(3)], and H3PMo12O40nH(2)O in protic solvents afforded two structurally related Fe-Co cyanometallate complexes: [{(pzTp)Fe(CN)(3)}(3)Co-3(MeOH)(10)][PMo12O40]H2O11MeOH (1, pzTp(-) = tetra(pyrazolyl)borate) and {[(pzTp)Fe(CN)(3)](4)Co-3(MeOH)(5)(H2O)(3)}(n)[HPMo12O40](n)3 nMeOH6.5nH(2)O (2). Complex 1 consists of a cyanide-bridged hexanuclear [Fe3Co3] cage, characterized by the fused conjunction of two mutually perpendicular trigonal bipyramids (TBPs, [Fe2Co3] and [Co2Fe3]), while complex 2 showcases an intricate cyanide-bridged Fe-Co tape comprising a central chain backbone of vertex-sharing [Fe2Co3] TBPs alongside peripheral [Fe2Co2] squares. Complex 2 is among the widest one-dimensional coordination assemblies characterized by the single-crystal X-ray diffraction technique. Magnetic studies revealed that complex 2 behaved as a single chain magnet with an effective energy barrier (U-eff/k(B)) of 46.8 K. Our findings highlight the possibilities in the development of cyanometallate-POM hybrid materials with captivating magnetic properties.
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