Abstract

New 2D cobalt(II) coordination polymer {[Co₃(μ₃-dppa)₂(4,4'-bipy)₂(H₂O)₄]·7H₂O}_n (1) was constructed hydrothermally using H₃dppa, 4,4'-bipy (H₃dppa is 5-(3,4-dicarboxylphenyl) picolinic acid, 4,4'-bipy is 4,4'-bipyridine), and cobalt acetate. Single-crystal X-ray diffraction analyses revealed that compound 1 crystallizes in the monoclinic system, space group P2₁/c. The adjacent Co(II) ions are bridged by μ₃-dppa ligands forming a Co(II) chain subunit. These chain subunits are further linked by 4,4'-bipy ligands into 2D coordination polymers, which are connected through O–H···O hydrogen bonds to form an overall 3D supramolecular structure. Magnetic studies for compound 1 revealed an antiferromagnetic coupling between the adjacent Co(II) centers.

中文翻译：

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氮杂环三羧酸配体构建的新型钴(II)配位聚合物：合成、结构分析和磁性

摘要

利用H ₃水热法构建新型二维钴(II)配位聚合物{[Co ₃ (μ ₃ -dppa) ₂ (4,4'-bipy) ₂ (H ₂ O) ₄ ]·7H ₂ O} _n ( 1 ) dppa、4,4'-联吡(H ₃ dppa是5-(3,4-二羧基苯基)吡啶甲酸，4,4'-联吡是4,4'-联吡啶)和乙酸钴。单晶X射线衍射分析表明，化合物1在单斜晶系、空间群P 2 ₁ / c中结晶。相邻的 Co(II) 离子通过 μ ₃ -dppa 配体桥接，形成 Co(II) 链亚基。这些链亚基进一步通过4,4'-联吡啶配体连接成2D配位聚合物，这些聚合物通过O–H···O氢键连接形成整体3D超分子结构。化合物1的磁性研究揭示了相邻 Co(II) 中心之间的反铁磁耦合。