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Treatment of Co (OTf) 2·6H2O, Li (pzTp) FeIII (CN) 3, and H3PMo12O40·nH2O in protic solvents afforded two structurally related Fe–Co cyanometallate complexes: (pzTp) Fe (CN) 33Co3 (MeOH) 10PMo12O40·H2O·11MeOH (1, pzTp– = tetra (pyrazolyl) borate) and (pzTp) Fe (CN) 34Co3 (MeOH) 5 (H2O) 3nHPMo12O40n·3 nMeOH·6. 5nH2O (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 (Ueff/kB) of 46. 8 K. Our findings highlight the possibilities in the development of cyanometallate-POM hybrid materials with captivating magnetic properties.
Cheng et al. (Fri,) studied this question.