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本文利用水热合成方法,将稀土氧化物与邻苯二乙酸(H2pda)反应得到了2个新颖的稀土配位聚合物{[Ln2(pda)3(H2O)2]·2H2O}n(Ln=Nd(1),La(2))。测定了它们的晶体结构,并进行了X-射线单晶衍射、红外光谱、荧光光谱和热重分析等性质的表征。晶体结构测定表明这2个化合物为异质同晶化合物。属单斜晶系,C2/c空间群。晶体学参数分别为配合物1:a=2.629 06(18)nm,b=1.611 72(11)nm,c=0.783 27(5)nm,β=93.173(5)°,V=3.313 9(4)nm3,Z=4,F(000)=1 840,μ=3.173 mm-1,Dc=1.878 g·cm-3,R1=0.022 6,wR2=0.060 9;配合物2:a=2.627 1(14)nm,b=1.614 9(8)nm,c=0.796 6(4)nm,β=92.850(9)°,V=3.375(3)nm3,Z=4,F(000)=1 816,μ=2.570 mm-1,Dc=1.823 g·cm-3,R1=0.0466,wR2=0.1416。化合物中邻苯二乙酸配体连接相邻的稀土金属离子,形成复杂的具有stp拓朴构型的三维网络结构。
In this paper, two novel rare earth coordination polymers {[Ln2 (pda) 3 (H2O) 2] · 2H2O} n were obtained by the hydrothermal synthesis method with the reaction of H2Pda and rare earth oxides (Ln = Nd (1), La (2)). Their crystal structures were determined and characterized by X-ray single crystal diffraction, infrared spectroscopy, fluorescence spectroscopy and thermogravimetric analysis. The crystal structure determination shows that these two compounds are heterogeneous isomorphous compounds. Is a monoclinic, C2 / c space group. The crystallographic parameters were as follows: a = 2.629 06 (18) nm, b = 1.611 72 (11) nm, c = 0.783 27 (5) nm, β = 93.173 ) nm3, Z = 4, F (000) = 1 840, μ = 3.173 mm -1, Dc = 1.878 g · cm -3, R1 = 0.022 6, wR2 = (4) nm, b = 1.614 9 (8) nm, c = 0.796 6 (4) nm, β = 92.850 (9) ° and V = 3.375 (3) μ = 2.570 mm-1, Dc = 1.823 g · cm-3, R1 = 0.0466, wR2 = 0.1416. In the compound, the phthalic acid ligands connect adjacent rare earth metal ions to form a complex three-dimensional network structure with stp topological configuration.