Li Shao Dong, Su Feng, Zhou Cheng Yong, Hu Qi Long, Li Ya Qi, Wang Zhi Jun
Department of Chemistry, Changzhi University, Changzhi 046011, People's Republic of China.
Acta Crystallogr C Struct Chem. 2022 Jan 1;78(Pt 1):23-29. doi: 10.1107/S2053229621012973.
Two new isostructural complexes, namely, poly[aquaμ-2-(4-carboxyphenoxy)terephthalato-κO:O:Ocobalt(II)], [Co(CHO)(CHN)(HO)] or [Co(μ-Hcpota)(phen)(HO)], I, and poly[aquaμ-2-(4-carboxyphenoxy)terephthalato-κO:O:Onickel(II)], [Ni(CHO)(CHN)(HO)] or [Ni(μ-Hcpota)(phen)(HO)], II, have been synthesized by solvothermal reactions. Complexes I and II were fully characterized by IR spectroscopy, elemental analyses, thermogravimetric analyses, and powder and single-crystal X-ray diffraction. They both present two-dimensional structures based on [M(μ-COO)] (M = Co or Ni) dinuclear metal units with a fes topology and a vertex symbol (4·8). Interestingly, the positions of the two dimeric metal motifs and the two partially deprotonated Hcpota ligands reproduce regular flying butterfly arrangements flipped upside down and sharing wings in the ab plane. Magnetic studies indicate antiferromagnetic interactions (J = -5.21 cm for I and -11.53 cm for II) in the dimeric units, with Co...Co and Ni...Ni distances of 4.397 (1) and 4.358 (1) Å, respectively, that are related to double syn-anti carboxylate bridges.
通过溶剂热反应合成了两种新的同构配合物，即聚[水合μ-2-(4-羧基苯氧基)对苯二甲酸根-κO:O:O钴(II)]，[Co(C₈H₄O₄)(C₁₂H₈N₂)(H₂O)] 或 [Co(μ-Hcpota)(phen)(H₂O)]，I，以及聚[水合μ-2-(4-羧基苯氧基)对苯二甲酸根-κO:O:O镍(II)]，[Ni(C₈H₄O₄)(C₁₂H₈N₂)(H₂O)] 或 [Ni(μ-Hcpota)(phen)(H₂O)]，II。配合物I和II通过红外光谱、元素分析、热重分析以及粉末和单晶X射线衍射进行了全面表征。它们均基于具有fes拓扑结构和顶点符号(4·8)的[M(μ-COO)] (M = Co或Ni)双核金属单元呈现二维结构。有趣的是，两个二聚金属基序和两个部分去质子化的Hcpota配体的位置在ab平面上呈现出规则的上下翻转且共享翅膀的飞舞蝴蝶排列。磁性研究表明二聚单元中存在反铁磁相互作用（I的J = -5.21 cm，II的J = -11.53 cm），Co...Co和Ni...Ni距离分别为4.397 (1) 和4.358 (1) Å，这与双顺-反羧酸桥有关。
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