Received 21 November 2009
aFaculty of Chemistry, Islamic Azad University, North Tehran Branch, Tehran, Iran,bYoung Researchers Club, Islamic Azad University, North Tehran Branch, Tehran, Iran, and cDepartment of Chemistry, Islamic Azad University, Khorramabad Branch, Khorramabad, Iran
Correspondence e-mail: email@example.com
The title compound, (C13H10N)2[Co(C6H2N2O4)2(H2O)2]·6H2O, consists of mononuclear trans-[Co(pz-2,3-dc)2(H2O)2]2- complex anions, (acrH)+ cations and uncoordinated water molecules (acr is acridine and pz-2,3-dcH2 is pyrazine-2,3-dicarboxylic acid). The CoII atom, which lies on a crystallographic center of symmetry, has a slightly distorted octahedral 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 molecules in axial positions. In the crystal, the components are held together by two distinct N-HO and C-HO hydrogen bonds with R22(8) graph-sets. The coordinated and uncoordinated water molecules are also involved in O-HO hydrogen bonds, which lead to the formation of layers with R33(12) graph-set motifs. Extensive - stacking interactions between parallel aromatic rings of the acridinium ions, with distances ranging from 3.533 (1) to 3.613 (1) Å, occur in the structure.
For the crystal structure of pyrazine-2,3-dicarboxylic acid (pz-2,3-dcH2), see: Takusagawa & Shimada (1973). For complexes of (pz-2,3-dcH2) and manganese, copper, zinc, iron and cadmium, see: Zou et al. (1999); Konar et al. (2004); Li et al. (2003); Xu et al. (2008); Ma et al. (2006). For complexes of (pz-2,3-dcH2) with main group metals such as calcium, magnesium and sodium, see: Ptasiewicz-Bak & Leciejewicz (1997a,b); Tombul et al. (2006). For related structures of CoII complexes with py-2,6-dcH2, see: Aghabozorg et al. (2007, 2009); Aghabozorg, Attar Gharamaleki et al. (2008). For a review article on proton-transfer agents and their metal complexes, see: Aghabozorg, Manteghi & Sheshmani (2008).
Data collection: SMART (Bruker, 1998); cell refinement: SAINT (Bruker, 1998); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: OM2301 ).
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