Aghabozorg Hossein, Attar Gharamaleki Jafar, Parvizi Mahdieh, Derikvand Zohreh
Acta Crystallogr Sect E Struct Rep Online. 2009 Dec 19;66(Pt 1):m83-4. doi: 10.1107/S1600536809053628.
The title compound, (C(13)H(10)N)(2)[Co(C(6)H(2)N(2)O(4))(2)(H(2)O)(2)]·6H(2)O, consists of mononuclear trans-Co(pz-2,3-dc)(2)(H(2)O)(2) complex anions, (acrH)(+) cations and uncoordinated water mol-ecules (acr is acridine and pz-2,3-dcH(2) is pyrazine-2,3-dicarboxylic acid). The Co(II) atom, which lies on a crystallographic center of symmetry, has a slightly distorted octa-hedral coordination environment, with two N and two O atoms from the (pz-2,3-dc)(2-) ligands in the equatorial plane and with two water mol-ecules in axial positions. In the crystal, the components are held together by two distinct N-H⋯O and C-H⋯O hydrogen bonds with R(2) (2)(8) graph-sets. The coordinated and uncoordinated water mol-ecules are also involved in O-H⋯O hydrogen bonds, which lead to the formation of layers with R(3) (3)(12) graph-set motifs. Extensive π-π stacking inter-actions between parallel aromatic rings of the acridinium ions, with distances ranging from 3.533 (1) to 3.613 (1) Å, occur in the structure.
标题化合物(C₁₃H₁₀N)₂[Co(C₆H₂N₂O₄)₂(H₂O)₂]·6H₂O由单核反式-[Co(pz - 2,3 - dc)₂(H₂O)₂]²⁻络合阴离子、(acrH)⁺阳离子和未配位的水分子组成（acr为吖啶，pz - 2,3 - dcH₂为吡嗪 - 2,3 - 二羧酸）。位于晶体学对称中心的Co(II)原子具有略微扭曲的八面体配位环境，赤道平面上有来自(pz - 2,3 - dc)²⁻配体的两个N原子和两个O原子，轴向位置有两个水分子。在晶体中，各组分通过两种不同的N - H⋯O和C - H⋯O氢键以R₂²(8)图集结合在一起。配位和未配位的水分子也参与O - H⋯O氢键，导致形成具有R₃³(12)图集 motif的层。吖啶鎓离子的平行芳香环之间存在广泛的π - π堆积相互作用，距离范围为3.533(1)至3.613(1) Å。
