Starosta Wojciech, Leciejewicz Janusz
Institute of Nuclear Chemistry and Technology, ul.Dorodna 16, 03-195 Warszawa, Poland.
Acta Crystallogr Sect E Struct Rep Online. 2010 Dec 8;67(Pt 1):m50-1. doi: 10.1107/S1600536810050762.
In the title coordination polymer, Li(2)(C(6)H(2)N(2)O(2))(H(2)O)(2) the pyrazine-2,5-dicarboxyl-ate dianionic ligand bridges two symmetry-independent Li(+) ions using both its N,O-chelating sites. The carboxyl-ate O atom of one of them also bridges to another Li(+) ion, while the second O atom of this group is bonded to another Li(+) ion. Two symmetry-independent water O atoms participate also in the bridging system, which gives rise to a polymeric three-dimensional framework. Both Li(+) ions show distorted trigonal-bipyramidal LiNO(4) coordination geometries, with the N atom in an axial site in both cases. The packing is consolidated by O-H⋯O hydrogen bonds, which occur between water mol-ecules as donors and carboxyl-ate O atoms as acceptors.
在标题配位聚合物[Li₂(C₆H₂N₂O₂)(H₂O)₂]ₙ中，吡嗪 - 2,5 - 二羧酸二价阴离子配体利用其N、O螯合位点桥连两个非对称独立的Li⁺离子。其中一个配体的羧酸根O原子还桥连至另一个Li⁺离子，而该基团的第二个O原子则与另一个Li⁺离子键合。两个非对称独立的水分子O原子也参与桥连体系，形成了一个三维聚合物框架。两个Li⁺离子均呈现扭曲的三角双锥LiNO₄配位几何构型，两种情况下N原子均处于轴向位置。堆积通过O—H⋯O氢键得以巩固，这些氢键存在于作为供体的水分子与作为受体的羧酸根O原子之间。
