title: catena-Poly[diacridinium [zinc(II)-di-μ-pyrazine-2,3-dicarboxyl-ato-κN,O:O;O:N,O]].
abstract: The crystal structure of the title compound, {(C(13)H(10)N)(2)[Zn(C(6)H(2)N(2)O(4))(2)]}(n), consists of polymeric Zn complex anions and discrete acridinium cations. The Zn cation, located on an inversion center, is N,O-chelated by two pyrazine-2,3-dicarboxyl-ate (pyzdc) anions in the basal plane, and is further coordinated by two carboxyl-ate O atoms from adjacent pyzdc anions in the axial directions with a longer Zn-O bond distance, forming a distorted ZnN(2)O(4) coordination geometry. The pyzdc anions bridge the Zn cations, forming polymeric chains running along the crystallographic b axis. The acridinium cations are linked to the complex chains via N-H⋯O and C-H⋯O hydrogen bonding. Significant π-π stacking between parallel acridinium ring systems is observed in the crystal structure, face-to-face distances being 3.311 (3) and 3.267 (4) Å.
authors: Hossein
authors: H
authors: Eshtiagh-Hosseini
authors: Hossein
authors: H
authors: Aghabozorg
authors: Masoud
authors: M
authors: Mirzaei
references: Acta Crystallogr A. 2008 Jan;64(Pt 1):112-22
references: 18156677
references: Acta Crystallogr Sect E Struct Rep Online. 2009 Dec 19;66(Pt 1):m83-4
references: 21579976