Xu Shan-Shan, Mi Jun-Long, Chen Hong-Ji
Department of Materials Science and Engineering, Jinan University, Guangzhou 510632, People's Republic of China.
Acta Crystallogr Sect E Struct Rep Online. 2013 Apr 27;69(Pt 5):m294-5. doi: 10.1107/S1600536813011057. Print 2013 May 1.
In the title compound, [Eu2(C6H5NO3)2(C2O4)3(H2O)4] n , the Eu(III) atom is bonded to one O atom from a monodentate 5-hy-droxy-pyridin-1-ium-3-carboxyl-ate ligand, six O atoms from three oxalate ligands and two water mol-ecules, exhibiting a highly distorted tricapped trigonal geometry. Three independent oxalate ligands, each lying on an inversion center, bridge the Eu(III) atoms, forming a brickwall-like layer parallel to (001), which is stabilized by intra-layer O-H⋯O hydrogen bonds. The layers are further linked through inter-layer O-H⋯O and N-H⋯O hydrogen bonds and π-π inter-actions between the pyridine rings [centroid-centroid distance = 3.5741 (14) Å] into a three-dimensional supra-molecular network.
在标题化合物[Eu₂(C₆H₅NO₃)₂(C₂O₄)₃(H₂O)₄]ₙ中，Eu(III)原子与一个来自单齿5-羟基吡啶-1-鎓-3-羧酸盐配体的O原子、来自三个草酸根配体的六个O原子以及两个水分子相连，呈现出高度扭曲的三帽三角几何构型。三个独立的草酸根配体，每个都位于一个对称中心上，桥连Eu(III)原子，形成一个平行于(001)的砖墙状层，该层通过层内O—H⋯O氢键得以稳定。这些层通过层间O—H⋯O和N—H⋯O氢键以及吡啶环之间的π-π相互作用[质心-质心距离 = 3.5741 (14) Å]进一步连接成一个三维超分子网络。
