Abstract
Three new 3d−4f heterometallic coordination polymers(CPs), namely, [Pr2(CuL)2(nipt)3(H2O)]·2H2O (Cu2Pr2, 1), [Eu2(CuL)2(nipt)3(H2O)]·2H2O(Cu2Eu2, 2) and [Tb2(CuL)4(nipt)3]·8.3H2O(Cu4Tb2, 3)(CuL, H2L=2,3-dioxo-5,6,14,15-dibenzo-1,4,8,12-tetraazacyclo-pentadeca-7,13-dien; nipt2-=5-nitroisophthalate) were obtained by a solvothermal method and structurally characterized by single-crystal X-ray diffraction analyses, elemental analyses, Fourier transform infrared spectra and ultraviolet visible absorption spectra. In Cu2Pr2 and Cu2Eu2, μ3-bridged and μ5-bridged nipt2- ligands alternately linked three Ln3+ and five metal ions(three Ln3+ and two Cu2+ ions) to generate a 2D heterometallic framework with 3,3,4,5-connected (3.4.5)(32.42.5.63.72)(42.63.8)(42.6) topology. In Cu4Tb2, μ2-bridged and μ4-bridged nipt2- ligands alternately connected two Tb3+ and four metal ions(two Tb3+ and two Cu2+ ions) by carboxylating into a corrugated heterometallic 2D layer with 3-connected (63) topology. The magnetic properties of Cu2Pr2 and Cu2Eu2 were also discussed, the results show that both CPs have a weak antimagnetic interaction. Moreover, the near-infrared luminescence properties of Cu2Pr2 and Cu2Eu2 were also studied.
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