Chen Xiang, Liu Hai-Cheng
Acta Crystallogr Sect E Struct Rep Online. 2010 Apr 21;66(Pt 5):m543. doi: 10.1107/S1600536810013735.
In the title complex, Pb(C(8)H(9)N(2)O(4))(2)(H(2)O)(2), the eight-coordinate Pb(II) atom lies on a twofold rotation axis and adopts a slightly distorted square-anti-prismatic N(2)O(6) coordination geometry. The ligand donor atoms are the tertiary N atoms of the imidazole rings and the carboxyl-ate O atoms of two chelating 5-carb-oxy-2-propyl-1H-imidazole-4-carboxyl-ate ligands, the carb-oxy O atoms of two additional imidazole ligands and two water O atoms. The carb-oxy O and the N,O-chelate systems also link adjacent Pb(II) atoms, forming a two-dimensional layer structure, with four individual Pb(II) atoms located at the corners of a square. These layers are further inter-connected by an extensive array of O-H⋯O and N-H⋯O hydrogen bonds into a three-dimensional network.
在标题配合物[Pb(C₈H₉N₂O₄)₂(H₂O)₂]ₙ中，八配位的Pb(II)原子位于二重旋转轴上，采用稍有畸变的N₂O₆ 方形反棱柱配位几何构型。配体供体原子为咪唑环的叔氮原子、两个螯合的5-羧基-2-丙基-1H-咪唑-4-羧酸盐配体的羧酸根O原子、另外两个咪唑配体的羧基O原子以及两个水分子的O原子。羧基O原子和N,O-螯合体系还连接相邻的Pb(II)原子，形成二维层状结构，四个独立的Pb(II)原子位于正方形的角上。这些层通过大量的O—H⋯O和N—H⋯O氢键进一步相互连接成三维网络。
