A polymeric Co(II) oxalate salt containing pyridinium type cations: Synthesis, structure, spectroscopy, thermal behavior and magnetism

IF 2.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR Polyhedron Pub Date : 2024-09-25 DOI:10.1016/j.poly.2024.117238

Ornela B.T. Tchougong , Carole F.N. Nguemdzi , Bridget N. Ndosiri , Ledoux S. Pouamo , Colince Nde , Mohammad Azam , Frédéric Capet , Michel Foulon , Justin Nenwa

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Abstract

A Co(II) oxalate coordination polymer, (C₇H₁₁N₂)₂[Co(C₂O₄)₂]·5H₂O (1) (C₇H₁₁N₂⁺ = 2-amino-4,6-dimethylpyridinium cation), has been synthesized and characterized by elemental and thermal analyses, FT-IR and UV/Vis spectroscopies, powder X-ray diffraction (PXRD), single-crystal X-ray diffraction and variable temperature magnetic susceptibility measurements. Compound 1 is a polymerized organic–inorganic hybrid salt, the asymmetric unit of which consists of one Co(II) ion, one bidentate C₂O₄²⁻ ligand, two halves of bidentate C₂O₄²⁻ ligands, two 2-amino-4,6-dimethylpyridinium C₇H₁₁N₂⁺ cations and five crystal water molecules. Each Co^II center is six-coordinated in a distorted octahedral geometry fulfilled by six oxygen atoms from three chelating C₂O₄²⁻ ligands. The [Co(C₂O₄)₂]²⁻ ions act as complex ligands and efficiently bridge neighboring Co²⁺ ions, forming chains of complex anions linked by hydrogen bonded water molecules. Hydrogen bonding interactions of the type OH∙∙∙O and NH∙∙∙O along with π–π stacking interactions between pyridine rings contribute to the stabilization of the 3D supramolecular framework. Temperature-dependence magnetic moment (µ) collected under zero-field cooled (ZFC) and field-cooled (FC) conditions revealed weak antiferromagnetic ordering at low temperatures.

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含有吡啶鎓阳离子的聚合草酸钴（II）盐：合成、结构、光谱、热行为和磁性

我们合成了一种草酸钴（II）配位聚合物 (C7H11N2)2[Co(C2O4)2]-5H2O(1)（C7H11N2+ = 2-氨基-4,6-二甲基吡啶鎓阳离子），并通过元素和热分析、傅立叶变换红外光谱和紫外/可见光谱、粉末 X 射线衍射 (PXRD)、单晶 X 射线衍射和变温磁感应强度测量对其进行了表征。化合物 1 是一种聚合的有机-无机杂化盐，其不对称单元由一个 Co(II)离子、一个双叉 C2O42- 配体、两个半双叉 C2O42- 配体、两个 2-氨基-4,6-二甲基吡啶鎓 C7H11N2+ 阳离子和五个晶体水分子组成。每个 CoII 中心都由三个螯合 C2O42- 配体中的六个氧原子配成扭曲的八面体几何形状。Co(C2O4)2]2-离子作为复合配体，有效地连接相邻的 Co2+ 离子，形成由氢键水分子连接的复合阴离子链。吡啶环之间的 OH∙∙∙∙O 和 NH∙∙∙∙O 型氢键相互作用以及 π-π 堆积相互作用有助于三维超分子框架的稳定。在零场冷却（ZFC）和场冷却（FC）条件下收集的随温度变化的磁矩（µ）显示，在低温下存在微弱的反铁磁有序性。

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来源期刊

Polyhedron 化学-晶体学

CiteScore

4.90

自引率

7.70%

发文量

515

审稿时长

2 months

期刊介绍： Polyhedron publishes original, fundamental, experimental and theoretical work of the highest quality in all the major areas of inorganic chemistry. This includes synthetic chemistry, coordination chemistry, organometallic chemistry, bioinorganic chemistry, and solid-state and materials chemistry. Papers should be significant pieces of work, and all new compounds must be appropriately characterized. The inclusion of single-crystal X-ray structural data is strongly encouraged, but papers reporting only the X-ray structure determination of a single compound will usually not be considered. Papers on solid-state or materials chemistry will be expected to have a significant molecular chemistry component (such as the synthesis and characterization of the molecular precursors and/or a systematic study of the use of different precursors or reaction conditions) or demonstrate a cutting-edge application (for example inorganic materials for energy applications). Papers dealing only with stability constants are not considered.