通过水热反应合成5种结构新颖的配聚物:{[Ln2(1,3-bdc)3(H2O)4](DMF(H2O}n[Ln=Pr(1),Nd(2),Gd(3)]和{[Ln4(1,3-bdc)6(H2O)4(DMF)](DMF(2H2O}n[Ln=Er(4),Ho(5)](1,3-bdc:间苯二甲酸,DMF:N,N-二甲基酰胺). 通过单晶X射线衍射、红外光谱、紫外-可见-近红外(UV-Vis-NIR)光谱、荧光光谱等技术手段对产物的结构和性能进行了表征. 结果表明,配聚物1~3是同构的,属单斜晶系,P2(1)/n空间群;配聚物4、5是同构的,属三斜晶系,P-1空间群. 在晶体中,间苯二甲酸根采用多样的配位模式,使配聚物呈现多维的结构. 除配聚物4,其余均呈现Ln(Ⅲ)的特征NIR发光,并与其UV-Vis-NIR吸收光谱相关联.
Five novel Ln(Ⅲ) coordination polymers, {[Ln2(1,3-bdc)3(H2O)4](DMF(H2O}n(Ln=Pr(1), Nd(2), Gd(3)) and {[Ln4(1,3-bdc)6(H2O)4(DMF)](DMF(2H2O}n(Ln=Er(4), Ho(5))(1,3-bdc=isophthalic acid, DMF=N,N-dimethyl formamide), have been synthesized by hydrothermal methods and characterized by single-crystal X-ray diffraction, infrared spectroscopy(IR), ultraviolet-visible-near infrared(UV-Vis-NIR) and fluorescence spectroscopy.The results show that coordination polymers 1 to 3 are isomorphous and crystallized in the monoclinic with space group P2(1)/n, and coordination polymers 4 and 5 are isomorphous and belong to the triclinic system with space group P-1.Polymers present multidimensional structures due to versatile coordination modes of 1,3-bdc2-in crystals.Except for coordination polymer 4, others exhibit NIR luminescent properties that are associated with UV-Vis-NIR absorption spectra.
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