Dissolution of a fine powder obtained by mechanochemical grinding of cobaltous carbonate with 4-nitrobenzoic acid (4-nbaH) in hot dimethylsulfoxide (DMSO) followed by slow evaporation of the solvent resulted in the formation of cis-diaquabis(dimethylsul-foxide)4-nitrobenzoatocobalt(II) 4-nitrobenzoate 1 in good yield. The title compound [Co(H₂O)₂(DMSO)₂(4-nba)]4-nba 1 crystallizes in the centrosymmetric monoclinic P2₁/c space group. The structure of 1 consists of two crystallographically independent Co(II) ions. Each unique cobalt exhibits octahedral geometry and is bonded to a pair of terminal aqua ligands situated cis to each other and a bidentate 4-nba ligand which form the square base of the octahedron. A pair of DMSO ligands disposed trans to each other complete the hexa coordination around the central metal. The [Co(H₂O)₂(DMSO)₂ (4-nba)]⁺ cations and the 4-nba anions are interlinked with the aid of several weak H-bonding interactions. A comparative study of several 4-nitrobenzoate compounds of cobalt is described.

中文翻译：

---

[Co（H2O）2（DMSO）2（4-nba）] 4-nba（DMSO =二甲基亚砜; 4-nba = 4-硝基苯甲酸酯）的合成和结构表征

将碳酸钴与4-硝基苯甲酸（4-nbaH）进行机械化学研磨而获得的细粉溶解在热的二甲基亚砜（DMSO）中，然后缓慢蒸发溶剂，从而形成顺式-二氢双（二甲基亚砜）4- 4-硝基苯甲酸硝基苯并钴（II）1收率高。标题化合物[Co（H ₂ O）₂（DMSO）₂（4-nba）] 4-nba 1在中心对称的单斜P 2 ₁ / c空间基团中结晶。1的结构由两个晶体学独立的Co（II）离子组成。每个独特的钴均表现出八面体的几何形状，并键合到一对彼此顺式排列的末端水族配体和一个形成八面体方形碱基的双齿4-nba配体。彼此反位的一对DMSO配体完成了围绕中心金属的六配位。[Co（H ₂ O）₂（DMSO）₂（4-nba）] ⁺阳离子和4-nba阴离子借助一些弱的H键相互作用相互连接。描述了几种钴的4-硝基苯甲酸酯化合物的比较研究。