Xu Rui, Liu Jian-Lan
Department of Applied Chemistry, College of Science, Nanjing University of Technology, Nanjing 210009, People's Republic of China.
Acta Crystallogr Sect E Struct Rep Online. 2012 Jul 1;68(Pt 7):m957. doi: 10.1107/S1600536812027158. Epub 2012 Jun 20.
The title complex, Mn(2)(C(18)H(4)O(10))(H(2)O)(4), was synthesized from manganese(II) chloride tetra-hydrate and 9,10-dioxo-9,10-dihydro-anthracene-1,4,5,8-tetra-carb-oxy-lic acid (H(4)AQTC) in water. The anthraquinone unit is located about a crystallographic center of inversion. Each asymmetric unit therefore contains one Mn(II) atom, two water ligands and one half AQTC(4-) anion. The Mn(II) atom is coordinated in a distorted octa-hedral geometry by four O atoms from three AQTC(4-) ligands and two water O atoms. Two of the carboxyl-ate groups coordinate one Mn(II) atom in a chelating mode, whereas the others each coordinate two Mn(II) atoms. Each AQTC(4-) tetra-anion therefore coordinates six different Mn(II) ions and, as a result, a three-dimensional coordination polymer is formed. O-H⋯O hydrogen bonds, some of them bifurcated, between water ligands and neighboring water or anthraquinone ligands are observed in the crystal structure.
标题配合物[Mn₂(C₁₈H₄O₁₀)(H₂O)₄]ₙ是由四水合氯化锰(II)和9,10-二氧代-9,10-二氢蒽-1,4,5,8-四羧酸(H₄AQTC)在水中合成的。蒽醌单元位于一个晶体学反演中心周围。因此，每个不对称单元包含一个Mn(II)原子、两个水配体和半个AQTC⁴⁻阴离子。Mn(II)原子通过来自三个AQTC⁴⁻配体的四个O原子和两个水O原子以扭曲的八面体几何构型配位。两个羧酸根基团以螯合模式配位一个Mn(II)原子，而其他羧酸根基团每个配位两个Mn(II)原子。因此，每个AQTC⁴⁻四阴离子配位六个不同的Mn(II)离子，结果形成了一种三维配位聚合物。在晶体结构中观察到水配体与相邻水或蒽醌配体之间的O—H⋯O氢键，其中一些是分叉的。
