Qiao Qian, Zhao Ya-Juan, Tang Tian-Di
College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325027, People's Republic of China.
Acta Crystallogr C. 2008 Oct;64(Pt 10):m336-8. doi: 10.1107/S0108270108028539. Epub 2008 Sep 20.
The cadmium(II) coordination polymer poly[[(pyrazino[2,3-f][1,10]phenanthroline-kappa(2)N(8),N(9))cadmium(II)]-mu(3)-naphthalene-1,4-dicarboxylato-kappa(5)O(1):O(1),O(1'):O(4),O(4')], Cd(C(12)H(6)O(4))(C(14)H(8)N(4)), contains two Cd(II) cations, two pyrazino[2,3-f][1,10]phenanthroline (L) ligands and two naphthalene-1,4-dicarboxylate (1,4-ndc) anions in the asymmetric unit. Both Cd(II) ions are in a distorted CdO(5)N(2) monocapped octahedral coordination geometry. Both unique 1,4-ndc ligands are bonded to three Cd(II) ions. In these modes, tetranuclear clusters are formed in which four Cd(II) ions are bridged by the carboxylate groups of the 1,4-ndc ligands to form discrete rods. The tetranuclear cadmium carboxylate clusters act as rod-shaped secondary building units (SBUs) within the structure. The SBUs are connected together by the aromatic backbone of the dicarboxylate ligands, connecting the clusters into a three-dimensional alpha-polonium net. The title compound represents the first alpha-polonium net constructed from rod-like clusters in coordination polymers. The result indicates that an appropriate combination of dicarboxylate and aromatic chelating ligands is critical to the formation of high-dimensional structures based on metal clusters in these systems.
镉（II）配位聚合物聚[[（吡嗪并[2,3 - f][1,10]菲咯啉 - κ(2)N(8),N(9))镉（II）] - μ(3)-萘 - 1,4 - 二羧酸根 - κ(5)O(1):O(1),O(1'):O(4),O(4')]，Cd(C(12)H(6)O(4))(C(14)H(8)N(4))，其不对称单元中包含两个Cd（II）阳离子、两个吡嗪并[2,3 - f][1,10]菲咯啉（L）配体和两个萘 - 1,4 - 二羧酸根（1,4 - ndc）阴离子。两个Cd（II）离子均处于扭曲的CdO(5)N(2)单帽八面体配位几何构型。两个独特的1,4 - ndc配体均与三个Cd（II）离子键合。在这些模式下，形成了四核簇，其中四个Cd（II）离子由1,4 - ndc配体的羧酸根基团桥连形成离散的棒状结构。四核羧酸镉簇在结构中充当棒状二级结构单元（SBU）。这些SBU通过二羧酸配体的芳香主链连接在一起，将簇连接成三维α - 钋网。该标题化合物代表了首例由配位聚合物中的棒状簇构建而成的α - 钋网。结果表明，二羧酸和芳香螯合配体的适当组合对于在这些体系中基于金属簇形成高维结构至关重要。
