Aghabozorg Hossein, Attar Gharamaleki Jafar, Daneshvar Shirin, Ghadermazi Mohammad, Khavasi Hamid Reza
Acta Crystallogr Sect E Struct Rep Online. 2007 Dec 18;64(Pt 1):m187-8. doi: 10.1107/S1600536807066032.
The title compound, (C(3)H(7)N(6))(2)[Co(H(2)O)(6)]Co(C(7)H(3)NO(4))(2)·4H(2)O, or (tataH)(2)[Co(H(2)O)(6)]Co(pydc)(2)·4H(2)O (where tata is 2,4,6-triamino-1,3,5-triazine and pydc is pyridine-2,6-dicarboxylic acid), was obtained by reaction of Co(NO(3))(2)·6H(2)O with the proton-transfer compound (tataH)(2)(pydc) in aqueous solution. The Co(pydc)(2) anion is a six-coordinate Co(II) complex with a distorted octa-hedral coordination geometry. The structure also contains hexa-aqua-cobalt(II) cations (site symmetry ), (tataH)(+) cations and uncoordinated water mol-ecules. The two(pydc)(2-) ligands in each Co(pydc)(2) anion are almost perpendicular to each other [dihedral angle between their mean planes = 82.3 (1)°]. There is extensive O-H⋯O, N-H⋯N, O-H⋯N and C-H⋯O hydrogen bonding in the structure, as well as π-π stacking between (pydc)(2-) ligands with an inter-planar distance of 3.484 (15) Å.
标题化合物（C(3)H(7)N(6))(2)[Co(H(2)O)(6)]Co(C(7)H(3)NO(4))(2)·4H(2)O，即(tataH)(2)[Co(H(2)O)(6)]Co(pydc)(2)·4H(2)O（其中tata为2,4,6 - 三氨基 - 1,3,5 - 三嗪，pydc为吡啶 - 2,6 - 二羧酸），通过Co(NO(3))(2)·6H(2)O与质子转移化合物(tataH)(2)(pydc)在水溶液中反应得到。Co(pydc)(2)阴离子是一个六配位的Co(II)配合物，具有扭曲的八面体配位几何构型。该结构还包含六水合钴(II)阳离子（位点对称性）、(tataH)(+)阳离子和未配位的水分子。每个Co(pydc)(2)阴离子中的两个(pydc)(2-)配体几乎相互垂直[它们平均平面之间的二面角 = 82.3 (1)°]。结构中存在广泛的O - H⋯O、N - H⋯N、O - H⋯N和C - H⋯O氢键，以及(pydc)(2-)配体之间的π - π堆积，平面间距为3.484 (15) Å。
