Shen Fwu Ming, Lush Shie Fu
Acta Crystallogr Sect E Struct Rep Online. 2011 Apr 1;67(Pt 4):m406-7. doi: 10.1107/S1600536811007446. Epub 2011 Mar 9.
The asymmetric unit of the title heterometallic coordination polymer, {[Cu(3)Yb(2)(C(7)H(3)NO(4))(6)(H(2)O)(12)]·2H(2)O}(n), contains one Yb(III) and two Cu(II) atoms. The Cu(II) atom that is located on an inversion center is N,O-chelated by two pyridine-2,5-dicarboxyl-ate (pdc) anions in a square-planar geometry; the Cu atom located on a general position is N,O-chelated by two pdc anions in the basal plane and is further coordinated by a water O atom at the apical position in a distorted square-pyramidal geometry. The Yb(III) atom is eight coordinated in a distorted square-anti-prismatic geometry formed by three carboxyl-ate O atoms from three pdc anions and five water mol-ecules. The pdc anions bridge adjacent Yb(III) and Cu(III) atoms, forming a three-dimensional polymeric structure. The crystal structure contains extensive O-H⋯O hydrogen bonds. π-π stacking is present in the crystal structure, the shortest centroid-centroid distance between parallel pyridine rings of adjacent mol-ecules being 3.646 (3) Å.
标题异金属配位聚合物{[Cu₃Yb₂(C₇H₃NO₄)₆(H₂O)₁₂]·2H₂O}ₙ的不对称单元包含一个Yb(III)原子和两个Cu(II)原子。位于对称中心的Cu(II)原子由两个吡啶-2,5-二羧酸根（pdc）阴离子以平面正方形几何构型进行N,O-螯合；位于一般位置的Cu原子在基面由两个pdc阴离子进行N,O-螯合，并在顶端位置由一个水分子的O原子进一步配位，形成扭曲的四方锥几何构型。Yb(III)原子由来自三个pdc阴离子的三个羧酸根O原子和五个水分子形成扭曲的四方反棱柱几何构型进行八配位。pdc阴离子桥连相邻的Yb(III)和Cu(III)原子，形成三维聚合物结构。晶体结构包含广泛的O-H⋯O氢键。晶体结构中存在π-π堆积，相邻分子平行吡啶环之间最短的质心-质心距离为3.646 (3) Å。
