Eshtiagh-Hosseini Hossein, Hassanpoor Azam, Mirzaei Masoud, Szymańska-Buzar Teresa, Kochel Andrzej
Acta Crystallogr Sect E Struct Rep Online. 2011 Apr 1;67(Pt 4):m455-6. doi: 10.1107/S1600536811008981. Epub 2011 Mar 15.
The title compound, (C(6)H(9)N(2))(2)[Cu(C(6)H(2)N(2)O(4))(2)(H(2)O)(2)]·6H(2)O, was obtained by the reaction of CuCl(2)·2H(2)O with pyrazine-2,3-dicarb-oxy-lic acid (pyzdcH(2)) and 2-amino-6-methyl-pyridine (2a-6mpy) in aqueous solution. The Cu(II) atom is located on an inversion centre and has an overall octa-hedral coordination environment. Two N and two O atoms from (pyzdc)(2-) ligands define the equatorial plane and two water mol-ecules are in axial positions, resulting in a typical tetra-gonally Jahn-Teller-distorted environment. Extensive classical O-H⋯O, O-H⋯N and N-H⋯O and non-classical C-H⋯O hydrogen bonds, as well as π-π stacking inter-actions between aromatic rings of the cations [centroid-centroid distance = 3.58 (9) Å], lead to the formation of a three-dimensional supra-molecular structure.
标题化合物（C(6)H(9)N(2))(2)[Cu(C(6)H(2)N(2)O(4))(2)(H(2)O)(2)]·6H(2)O是通过CuCl(2)·2H(2)O与吡嗪 - 2,3 - 二羧酸（pyzdcH(2)）和2 - 氨基 - 6 - 甲基吡啶（2a - 6mpy）在水溶液中反应得到的。Cu(II)原子位于一个对称中心上，具有一个整体八面体配位环境。来自（pyzdc）(2-)配体的两个N原子和两个O原子定义了赤道平面，两个水分子处于轴向位置，形成了一个典型的四方 Jahn - Teller 畸变环境。广泛的经典O - H⋯O、O - H⋯N和N - H⋯O以及非经典C - H⋯O氢键，以及阳离子芳香环之间的π - π堆积相互作用（质心 - 质心距离 = 3.58 (9) Å），导致形成三维超分子结构。
