Li Xu, Lian Qing-Yang, Meng Qiu-Hui, Luo Yi-Fan, Zeng Rong-Hua
Acta Crystallogr Sect E Struct Rep Online. 2009 Oct 3;65(Pt 11):m1288-9. doi: 10.1107/S1600536809039075.
In the title complex, Dy(C(7)H(3)NO(4))(C(7)H(4)NO(4)), one of the ligands is fully deprotonated while the second has lost only one H atom. Each Dy(III) ion is coordinated by six O atoms and two N atoms from two pyridine-2,6-dicarboxyl-ate and two 6-carboxy-picolinate ligands, displaying a bicapped trigonal-prismatic geometry. The average Dy-O bond distance is 2.40 Å, some 0.1Å longer than the corresponding Ho-O distance in the isotypic holmium complex. Adjacent Dy(III) ions are linked by the pyridine-2,6-dicarboxyl-ate ligands, forming a layer in (100). These layers are further connected by π-π stacking inter-actions between neighboring pyridyl rings [centroid-centroid distance = 3.827 (3) Å] and C-H⋯O hydrogen-bonding inter-actions, assembling a three-dimensional supra-molecular network. Within each layer, there are other π-π stacking inter-actions between neighboring pyridyl rings [centroid-centroid distance = 3.501 (2) Å] and O-H⋯O and C-H⋯O hydrogen-bonding inter-actions, which further stabilize the structure.
在标题配合物[Dy(C₇H₃NO₄)(C₇H₄NO₄)]ₙ中，其中一个配体完全去质子化，而另一个仅失去了一个氢原子。每个Dy(III)离子由来自两个吡啶 - 2,6 - 二羧酸酯和两个6 - 羧基吡啶酸酯配体的六个氧原子和两个氮原子配位，呈现出双帽三角棱柱几何构型。Dy - O键的平均键长为2.40 Å，比同型钬配合物中相应的Ho - O键长约长0.1 Å。相邻的Dy(III)离子通过吡啶 - 2,6 - 二羧酸酯配体相连，在(100)面形成一层。这些层通过相邻吡啶环之间的π - π堆积相互作用[质心 - 质心距离 = 3.827(3) Å]和C - H⋯O氢键相互作用进一步连接，组装成三维超分子网络。在每一层内，相邻吡啶环之间还存在其他π - π堆积相互作用[质心 - 质心距离 = 3.501(2) Å]以及O - H⋯O和C - H⋯O氢键相互作用，这进一步稳定了结构。
