Guan Biao, Zhang Chao-Hua, Song Wen-Dong
Acta Crystallogr Sect E Struct Rep Online. 2009 Jul 11;65(Pt 8):m896-7. doi: 10.1107/S1600536809026130.
In the title complex, Ag(2)La(C(6)H(4)NO(2))(4)(ClO(4))(H(2)O)(5), the La(III) atom, lying on a twofold rotation axis, is eight-coordinated by four O atoms from four nicotinate (nic) ligands and four water mol-ecules in a distorted square-anti-prismatic coordination geometry. The Ag(I) atom is coordinated in an almost linear fashion by two pyridyl N atoms of two nic ligands. The linear coordination is augmented by weak inter-actions with one O atom from a half-occupied ClO(4) (-) anion and a water mol-ecule lying on a twofold axis. Two Ag(nic)(2) units connect two La atoms, forming a cyclic unit. These units are further extended into an infinite zigzag chain. The chains are bridged by the disordered perchlorate ions via weak Ag-O [2.678 (2) Å] inter-actions. O-H⋯O hydrogen bonds, weak Ag⋯Ag [3.3340 (15) Å] inter-actions and π-π inter-actions between the pyridyl rings [centroid-centroid distance = 3.656 (2) Å] lead to a three-dimensional network.
在标题配合物[Ag₂La(C₆H₄NO₂)₄(ClO₄)(H₂O)₅]ₙ中，位于二重旋转轴上的La(III)原子由来自四个烟酸酯（nic）配体的四个O原子和四个水分子以扭曲的四方反棱柱配位几何构型八配位。Ag(I)原子由两个nic配体的两个吡啶基N原子以几乎线性的方式配位。通过与一个半占据的ClO₄⁻阴离子的一个O原子和位于二重轴上的一个水分子的弱相互作用增强了线性配位。两个Ag(nic)₂单元连接两个La原子，形成一个环状单元。这些单元进一步延伸成无限的锯齿链。这些链通过无序的高氯酸根离子经由弱的Ag - O [2.678 (2) Å]相互作用桥连。O - H⋯O氢键、弱的Ag⋯Ag [3.3340 (15) Å]相互作用以及吡啶环之间的π - π相互作用[质心 - 质心距离 = 3.656 (2) Å]导致形成三维网络。
