Lush Shie Fu, Shen Fwu Ming
Acta Crystallogr Sect E Struct Rep Online. 2011 May 1;67(Pt 5):m615-6. doi: 10.1107/S1600536811014048. Epub 2011 Apr 22.
The asymmetric unit of the title heterometallic polymeric coordination compound, {[CuYb(2)(C(7)H(3)NO(4))(4)(H(2)O)(8)]·H(2)O}(n), contains one Cu(II) cation located on an inversion center, a Yb(III) cation, two pyridine-2,5-dicarboxyl-ate (pda) anions, four coordination water mol-ecules a disordered lattice water molecule, which is half-occupied and is located close to an inversion center. The Cu(II) cation is N,O-chelated by two pda anions in the coordination basal plane and further coordinated by two carboxyl O atoms at the apical positions, with an elongated octa-hedral geometry. The Yb(III) atom is eight-coordinated in a distorted square-anti-prismatic geometry formed by two carboxyl-ate O atoms from two pda anions, and is N,O-chelated by one pda anion and four coordinated water mol-ecules. The pda anions bridge adjacent Yb and Cu cations, forming a three-dimensional polymeric structure. The crystal structure features extensive O-H⋯O hydrogen bonds. π-π stacking is observed between parallel pyridine rings, the centroid-centroid distance being 3.843 (4) Å.
标题异金属聚合物配位化合物{[CuYb₂(C₇H₃NO₄)₄(H₂O)₈]·H₂O}ₙ的不对称单元包含一个位于对称中心的Cu(II)阳离子、一个Yb(III)阳离子、两个吡啶-2,5-二羧酸根（pda）阴离子、四个配位水分子和一个无序的晶格水分子，该晶格水分子占据一半位置且位于对称中心附近。Cu(II)阳离子在配位基面中被两个pda阴离子进行N,O-螯合，并在顶端位置进一步与两个羧基O原子配位，呈拉长的八面体几何构型。Yb(III)原子由来自两个pda阴离子的两个羧酸根O原子形成扭曲的四方反棱柱几何构型进行八配位，并被一个pda阴离子和四个配位水分子进行N,O-螯合。pda阴离子桥连相邻的Yb和Cu阳离子，形成三维聚合物结构。晶体结构具有广泛的O-H⋯O氢键。在平行的吡啶环之间观察到π-π堆积，质心间距为3.843 (4) Å。
