以1,2,3-三氮唑基杂环多羧酸H3ctia(H3ctia=5-(4-carboxyl-1H-1,2,3-triazol-1-yl) isophthalic acid)为配体合成了一系列三维镍(Ⅱ)-镧(Ⅲ)混金属配位聚合物[Ln2Ni(tia)4(H2O)4]n(Ln=La (1)、Ce (2)、Pr(3)、Nd (4)、Sm(5)、Eu (6)、Gd (7)、Tb (8)、Dy(9))和[[Yb2Ni(tia)4(H2O)2]·2H2O]n(10) (tia=5-(1H-1,2,3-triazol-1-yl)isophthalate).X射线单晶衍射测试表明,配合物1～10皆具有三维网格结构,其中配合物1～9同构,而配合物10的组成与1～9一样,但晶体学结构则完全不同.在可见光区域,化合物5、6、8和9分别出现了Sm、Eu 、Tb和Dy的特征发射峰,其中配合物6、8和9的荧光寿命分别为234、598和2.96 μs;在近红外区域,配合物4、9和10分别出现了Nd、Dy和Yb的特征发射峰,对应的荧光寿命分别为4.25、3.42和5.66 μs.%A series of Ni(Ⅱ)-Ln(Ⅲ) heterometallic isomers [Ln2Ni(tia)4(H2O)4]n (Ln=La (1),Ce (2),Pr (3),Nd (4),Sm (5),Eu (6),Gd (7),Tb (8) and Dy (9)),and [[Yb2Ni(tia)4(H2O)2]· 2H2O]n (10) (tia=5-(1H-1,2,3-triazol-1-yl)isophthalate) have been constructed from the tritopic 1,2,3-trazol-based aromatic heterocyclic carboxylic ligand H3ctia (H3ctia=5-(4-carboxyl-1H-1,2,3-triazol-1-yl) isophthalic acid).The results of single crystal X-ray diffraction show that all of these complexes possess 3D microporous frameworks.Complexes 1～9 are isomorphic.The chemical composition of complex 10 is the same as those of 1～9,but the crystallographic structure is totally different from 1～9.In the visible region,complexes 5,6,8 and 9 exhibit the characteristic luminescent emissions of Sm(Ⅲ),Eu(Ⅲ),Tb(Ⅲ) and Dy(Ⅲ) with the long luminescent lifetime (234 μs for 6,598 μs for 8 and 2.96 μs for 9).Complexes 4,9 and 10 show characteristic emissions of Nd(Ⅲ),Dy(Ⅲ),and Yb(Ⅲ) in the near infrared region with the average lifetime of 4.25,3.42 and 5.66 μs,respectively.
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