Li Zhao-Yang, Yue Shan-Tang
School of Chemistry and Environment, South China Normal University, Guangzhou 510006, People's Republic of China.
Acta Crystallogr Sect E Struct Rep Online. 2009 Dec 24;66(Pt 1):m88-9. doi: 10.1107/S1600536809054208.
In the title compound, {[AgSm(C(6)H(4)NO(2))(2)(C(2)O(4))]·H(2)O}(n), the asymmetric unit contains one Sm(III) ion, one Ag(I) ion, two unique isonicotinate (ina) ligands, two half oxalate (ox) ligands (one on an inversion centre, the other on a twofold axis) and one uncoordinated water mol-ecule. The central Sm(III) ion is nine-coordinated by four O-donor atoms from separate bidentate bridging ox ligands and five O-donor atoms from the two ina ligands (both bidentate) and a symmetry-related ina ligand [Sm-O = 2.389 (4)-2.791 (4) Å], giving a distorted monocapped square anti-prismatic geometry. The Ag(I) ion is three-coordinated in a T-shaped geometry involving two ina N-donor atoms [Ag-N = 2.181 (6) and 2.185 (5) Å] and a bridging oxalate O-donor atom [Ag-O = 2.620 (4) Å]. The three-dimensional heterometallic Sm-Ag coordination polymer, having a unique (3,4,6)-connected five-nodal net topology, is constructed from two-dimensional samarium-oxalate layers and pillared Ag(ina)(2) subunits. Inter-molecular water-carboxyl-ate O-H⋯O hydrogen-bonding inter-actions are also present.
在标题化合物{[AgSm(C₆H₄NO₂)₂(C₂O₄)]·H₂O}ₙ中，不对称单元包含一个Sm(III)离子、一个Ag(I)离子、两个独特的异烟酸酯（ina）配体、两个半草酸根（ox）配体（一个在对称中心上，另一个在二重轴上）和一个未配位的水分子。中心Sm(III)离子由来自不同双齿桥联草酸根配体的四个O供体原子以及来自两个ina配体（均为双齿）和一个对称相关的ina配体的五个O供体原子九配位[Sm - O = 2.389 (4)-2.791 (4) Å]，形成扭曲的单帽四方反棱柱几何构型。Ag(I)离子以T形几何构型三配位，涉及两个ina N供体原子[Ag - N = 2.181 (6)和2.185 (5) Å]以及一个桥联草酸根O供体原子[Ag - O = 2.620 (4) Å]。具有独特的(3,4,6)连接五节点网络拓扑结构的三维异金属Sm - Ag配位聚合物由二维钐 - 草酸盐层和支柱状Ag(ina)₂亚基构成。分子间还存在水 - 羧酸盐O - H⋯O氢键相互作用。
