Li Sheng, Zhang Fu-Li, Wang Shou-Bin, Bai Hui-Ling
Acta Crystallogr Sect E Struct Rep Online. 2009 Mar 19;65(Pt 4):m410. doi: 10.1107/S1600536809008824.
The title compound, {[Tb(C(7)H(3)NO(4))(C(7)H(4)NO(4))(H(2)O)(2)]·2H(2)O}(n), is isotypic with the analogous Tm(III) compound [Li, Zhang, Wang & Bai (2009). Acta Cryst. E65, m411]. The Tb(III) atom is octa-coordinated by two water mol-ecules and by four carboxyl-ate O atoms and two pyridyl N atoms from two pyridine-2,5-dicarboxyl-ate (2,5-pydc) and two 6-carboxy-nicotinate (2,5-Hpydc) ligands. The 2,5-pydc and 2,5-Hpydc ligands bridge Tb(III) atoms, generating helical coordination polymers along [001]. An extensive network of O-H⋯O hydrogen bonds is formed between the coordination polymers and the uncoordinated water mol-ecules. The refined Flack parameter of 0.54 (2) suggests inversion twinning.
标题化合物{[Tb(C₇H₃NO₄)(C₇H₄NO₄)(H₂O)₂]·2H₂O}ₙ与类似的铥(III)化合物[Li, Zhang, Wang & Bai (2009). Acta Cryst. E65, m411]同构。Tb(III)原子由两个水分子、来自两个吡啶 - 2,5 - 二羧酸根(2,5 - pydc)和两个6 - 羧基烟酸根(2,5 - Hpydc)配体的四个羧酸根O原子和两个吡啶基N原子八配位。2,5 - pydc和2,5 - Hpydc配体桥连Tb(III)原子，沿[001]方向生成螺旋配位聚合物。在配位聚合物与未配位的水分子之间形成了广泛的O - H⋯O氢键网络。精修的Flack参数为0.54(2)，表明存在倒易孪晶。
