Shi Congwen, Fan Liming, Wei Peihai, Li Bin, Zhang Xiutang
Acta Crystallogr Sect E Struct Rep Online. 2010 Jun 18;66(Pt 7):m822-3. doi: 10.1107/S1600536810023007.
The asymmetric unit of the title compound, [Co(2)(C(2)O(4))(C(10)H(8)N(2))(4)][W(6)O(19)], consists of one half of the complex Co(2)(C(2)O(4))(C(10)H(8)N(2))(4) cation and one half of the Lindqvist-type W(6)O(19) isopolyanion. Both constituents are completed by crystallographic inversion symmetry. In the dimeric cation, the Co(II) atom is surrounded in a distorted octa-hedral coordination by four N atoms from two chelating 2,2'-bipyridine ligands and by two O atoms from the chelating oxalate anion. The Lindqvist-type anion exhibits the characteristic W-O bond-length distribution, with the shortest bonds being the W-O(terminal) bonds and the longest being those to the central O atom.
标题化合物[Co₂(C₂O₄)(C₁₀H₈N₂)₄][W₆O₁₉]的不对称单元由配合物[Co₂(C₂O₄)(C₁₀H₈N₂)₄]²⁺阳离子的一半和Lindqvist型[W₆O₁₉]²⁻异多阴离子的一半组成。这两种成分均通过晶体学倒转对称性得以完整。在二聚阳离子中，Co(II)原子由来自两个螯合2,2'-联吡啶配体的四个N原子以及来自螯合草酸根阴离子的两个O原子以扭曲的八面体配位方式环绕。Lindqvist型阴离子呈现出特征性的W - O键长分布，最短的键是W - O(端基)键，最长的键是与中心O原子相连的键。
