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合成了吡啶-2,6-二甲酸稀土配合物晶体。元素分析表明,化学式为((CH_3)_4N)_2Ln(H_2DPA)_2(DPA)Cl(Ln为La、Ce,Pr、Nd和Sm;DPA为吡啶-2,6-二甲酸根)。用X射线衍射法测定了镧配合物的单晶结构,其结构式为((CH_3)_4N)_2[La(H_2DPA)_2(DPA)]Cl,属正交晶系,空间群Pccn。晶胞参数:α=1.0321(1),b=1.4951(2),c=2.0766(6)nm;V=3.2044(9)nm~3;Z=4。吡啶-2,6-二甲酸以三齿配位,镧的配位数为9,其配位多面体为扭曲的三冠三角棱柱体。
The crystal of rare earth complex of pyridine-2,6-dicarboxylic acid was synthesized. Elemental analysis showed that the chemical formula is (CH_3) _4N) _2Ln (H_2DPA) _2 (DPA) Cl (Ln is La, Ce, Pr, Nd and Sm; DPA is pyridine-2,6-dicarboxylate). The single crystal structure of lanthanum complex was determined by X-ray diffraction. Its structure is (CH_3) _4N) _2 [La (H_2DPA) _2 (DPA)] Cl and belongs to orthorhombic system with space group Pccn. Cell parameters: α = 1.0321 (1), b = 1.4951 (2), c = 2.0766 (6) nm; V = 3.2044 (9) nm ~ 3; Pyridine-2,6-dicarboxylic acid with tridentate coordination, lanthanum coordination number 9, its coordination polyhedron is a twisted triangular crown prism.