Abstract
The solvothermal reactions of 2,3,5-trichlorobenzoic acid (HL) 2,2′-bipyridine (bipy), CoCl2·6H2O, and Ln2O3 afforded three novel 3d–4f tetranuclear complexes Co2Ln2(L)10(bipy)2 (Ln = Dy 1, Ho 2, and Er 3), which have been characterized by single-crystal X-ray diffraction, infrared spectroscopy, and element analyses. Complexes 1–3 crystallize in the triclinic space group P1, and the completely deprotonated L ligands possess μ2 : η2, η1 and μ2 : η1, η1 coordination modes to bridge adjacent metal ions, which further connect into 2D layers by hydrogen bonds. Magnetic studies indicate ferromagnetic interactions between adjacent metal ions in complexes 1 and 3.
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