Wang Yuanlan, Wang Chongchen
Acta Crystallogr Sect E Struct Rep Online. 2008 Sep 20;64(Pt 10):m1282-3. doi: 10.1107/S1600536808029164.
In the hydro-thermally synthesized title compound, Ce(C(5)H(3)N(2)O(2))(C(2)O(4))(H(2)O)(2), the Ce(III) ion is coordinated by four O atoms from two different oxalate ligands, three O atoms from two symmetry-related pyrazine-2-carboxyl-ate ligands, two O atoms from two water melecules and one N atom from a pyrazine-2-carboxyl-ate ligand in a distorted bicapped square-anti-prismatic coordination geometry. The oxalate and pyrazine-2-carboxyl-ate ligands bridge the Ce(III) ions, forming a two-dimensional structure. In addition, inter-molecular O-H⋯O and O-H⋯N hydrogen bonds connect the two-dimensional structure into a three-dimensional network.
在水热合成的标题化合物[Ce(C₅H₃N₂O₂)(C₂O₄)(H₂O)₂]ₙ中，Ce(III)离子由来自两个不同草酸根配体的四个O原子、来自两个对称相关的吡嗪 - 2 - 羧酸盐配体的三个O原子、来自两个水分子的两个O原子以及来自一个吡嗪 - 2 - 羧酸盐配体的一个N原子配位，形成扭曲的双帽四方反棱柱配位几何构型。草酸根和吡嗪 - 2 - 羧酸盐配体桥连Ce(III)离子，形成二维结构。此外，分子间的O - H⋯O和O - H⋯N氢键将二维结构连接成三维网络。
