Abstract
AbstractSolvothermal combination of trivalent lanthanide metal precursors with 1, 2, 4, 5‐cyclohexanetetracarboxylic acid (L) ligand has afforded the preparation of a family of eight new coordination polymers [Ln4(L)3(H2O)10]·7H2O (Ln = Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb) (1–8). Structural analyses reveal that the 1, 2, 4, 5‐cyclohexanetetracarboxylic acid ligand with e,a,a,e (LI) conformation displays a μ4‐(κ3O, O, O5)(κ2O2,O2)(κ2O4,O4)‐bridging mode to generate 3D frameworks of complexes 1–8 and the α‐Po topology with the short Schläfli symbol {412.63} could be observed in complexes 1–8. The near‐infrared luminescence properties were studied, and the results have shown that the HoIII, ErIII, and YbIII complexes emit typical near‐infrared luminescence in the solid‐state. Variable‐temperature magnetic susceptibility measurements of complexes 2–7 have shown that complex 2 (Gd) shows the ferromagnetic coupling between magnetic centers, whereas the complexes 3–7 show the antiferromagnetic coupling between magnetic centers. Additionally, the thermogravimetric analyses were discussed.
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