基于甲酸根离子原位形成的单个稀土配位聚合物的构筑及其掺杂化合物的荧光性质研究

In situ formate anion formation of a single Ln(ΙΙΙ) coordination polymer: syntheses, and the luminescent properties of its doped compounds

摘要:

通过混合溶剂热反应合成了一个三维框架结构的稀土配位聚合物, [La(HCO2)3]n (1). 对化合物1进行了X-射线单晶衍射以及粉末衍射、元素分析、红外光谱、热重性质等表征工作. 单晶衍射结果显示该化合物结晶与三方晶系, R3m空间群, 晶胞参数a = 1.0683(9) nm, b = 1.0683(9) nm, c = 0.4139(7) nm, β = 101.117(3). 甲酸根离子是N,N-二甲基甲酰胺(DMF)溶剂的原位分解而产生的. 中心离子La(ΙΙΙ)具有九配位的配位构型, 其九个位置被来自不同九个甲酸根离子中的一个氧原子所占据. 而一个甲酸根离子连接三个La(ΙΙΙ)形成一个新颖的双节点(3, 9)-连接的三维骨架结构化合物, 具有(4.62)3(46.621.89) Schläfli符号. 此外, 我们还研究化合物1掺杂其他稀土离子(Eu, Tb, Dy)所形成三个化合物1-La/Eu, 1-La/Tb, 1-La/Dy的固体荧光性质.

Abstract:

A three-dimensional (3D) single Ln(ΙΙΙ) coordination polymers, [La(HCO2)3]n (1), was synthesized in DMF/H2O mixed solvent under solvothermal condition. The formate anions were generated in situ from the N,N-dimethylformamide (DMF) solvent. Compound 1 has been characterized by single-crystal and powder X-ray diffraction, elemental analysis, IR spectra, and thermogravimetric analysis. Compound 1 crystallizes in the rhombohedral, space group R3m. The central La(ΙΙΙ) ion is nine-coordinated by nine formate oxygen atoms from nine formate anions, and the formate anions linking three La(ΙΙΙ) ions form a novel binodal (3, 9)-connected 3D net with Schläfli symbol (4.62)3(46.621.89). Furthermore, 1-La samples doped with Eu, Tb, and Dy show their characteristic luminescence.