3 nm-wide Cyanometallate Fe-Co Tape Exhibiting Single-Chain Magnet Behavior.

Treatment of Co(OTf) 2 ·6H 2 O, Li[(pzTp)Fe III (CN) 3 ], and H 3 PMo 12 O 40 · n H 2 O in protic solvents afforded two structurally related Fe-Co cyanometallate complexes: [{(pzTp)Fe(CN) 3 } 3 Co 3 (MeOH) 10 ][PMo 12 O 40 ]·H 2 O·11MeOH ( 1 , pzTp - = tetra(pyrazolyl)borate) and {[(pzTp)Fe(CN) 3 ] 4 Co 3 (MeOH) 5 (H 2 O) 3 } n [HPMo 12 O 40 ] n ·3 n MeOH·6.5 n H 2 O ( 2 ). Complex 1 consists of a cyanide-bridged hexanuclear [Fe 3 Co 3 ] cage, characterized by the fused conjunction of two mutually perpendicular trigonal bipyramids (TBPs, [Fe 2 Co 3 ] and [Co 2 Fe 3 ]), while complex 2 showcases an intricate cyanide-bridged Fe-Co tape comprising a central chain backbone of vertex-sharing [Fe 2 Co 3 ] TBPs alongside peripheral [Fe 2 Co 2 ] 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.