Guan Biao, Zhang Chao-Hua, Song Wen-Dong
Acta Crystallogr Sect E Struct Rep Online. 2009 Jan 17;65(Pt 2):m208-9. doi: 10.1107/S1600536809001718.
In the title compound, {[Ag(2)Pr(C(6)H(4)NO(2))(4)(H(2)O)(4)]ClO(4)·H(2)O}(n), the Pr(III) atom, lying on a twofold rotation axis, has a distorted square-anti-prismatic coordination geometry, defined by four O atoms from four nicotinate (nic) ligands and four water mol-ecules. The Ag(I) atom is coordinated in an almost linear fashion by two pyridyl N atoms from two nicotinate ligands. The linear coordination is augmented by weak inter-actions with three O atoms from one perchlorate anion, one uncoordinated water mol-ecule and one carboxyl-ate group. Two Pr atoms link two {Ag(nic)(2)}(+) units into a ring, which is further extended into an infinite zigzag chain by sharing the Pr atoms. These chains are further connected into a three-dimensional network via weak Ag⋯O inter-actions, O-H⋯O hydrogen bonds, Ag⋯Ag inter-actions [3.357 (2) Å] and π-π inter-actions between the pyridyl rings [centroid-centroid distance = 3.685 (4) Å].
在标题化合物{[Ag₂Pr(C₆H₄NO₂)₄(H₂O)₄]ClO₄·H₂O}ₙ中，位于二重旋转轴上的Pr(III)原子具有扭曲的四方反棱柱配位几何构型，由来自四个烟酸酯（nic）配体的四个O原子和四个水分子定义。Ag(I)原子由来自两个烟酸酯配体的两个吡啶基N原子以几乎线性的方式配位。这种线性配位通过与一个高氯酸根阴离子的三个O原子、一个未配位的水分子和一个羧酸根基团的弱相互作用得到增强。两个Pr原子将两个{Ag(nic)₂}(+)单元连接成一个环，通过共享Pr原子进一步扩展成无限的锯齿链。这些链通过弱的Ag⋯O相互作用、O - H⋯O氢键、Ag⋯Ag相互作用[3.357 (2) Å]以及吡啶环之间的π - π相互作用[质心 - 质心距离 = 3.685 (4) Å]进一步连接成三维网络。
