由半刚性三羧酸配体构筑的一维和二维钴(Ⅱ)配位聚合物的合成、晶体结构及磁性质
Syntheses, Crystal Structures and Magnetic Properties of 1D and 2D Cobalt(Ⅱ) Coordination Polymers Constructed from Semir-igid Tricarboxylic Acid
作者单位E-mail
顾文君 西南大学动物科技学院, 重庆 400715  
顾金忠 兰州大学化学化工学院, 兰州 730000 gujzh@lzu.edu.cn 
摘要: 采用水热方法,用半刚性三羧酸配体(H3cpta)和菲咯啉(phen)或2,2'-联吡啶(2,2'-bipy)与CoCl2·6H2O反应,合成了一个一维链状配位聚合物[Co(μ2-Hcpta)(phen)(H2O)]n1)和一个二维层状配位聚合物[Co3μ5-cpta)2(2,2'-bipy)2]n2),并对其结构和磁性质进行了研究。结构分析结果表明2个配合物均属于单斜晶系,P21/c空间群。配合物1具有一维链状结构,而且这些一维链状结构通过C-H…O氢键作用进一步形成了二维超分子网络。而配合物2具有由三核钴单元构筑的二维层状结构。研究表明,配合物12中相邻钴离子间存在反铁磁相互作用。
关键词: 配位聚合物  氢键  三羧酸配体  磁性
基金项目: 国家自然科学基金(No.)资助项目。
Abstract: Two 1D and 2D cobalt(Ⅱ) coordination polymers, namely[Co(μ2-Hcpta)(phen)(H2O)]n (1) and[Co3(μ5-cpta)2(2,2'-bipy)2]n(2), have been constructed hydrothermally using H3cpta (H3cpta=2-(2-carboxyphenoxy)terephthalic acid), phen (phen=phenanthroline) or 2,2'-bipy (2,2'-bipy=2,2'-bipyridine), and cobalt chloride. Single-crystal X-ray diffraction analyses revealed that the two compounds crystallize in the monoclinic system, space group P21/c. In compound 1, the carboxylate groups of Hcpta2- ligands bridge alternately neighboring metal ions to form a chain. Adjacent chains are assembled to a 2D supramolecular network through C-H…O hydrogen bond. Compound 2 shows a 2D sheet based on Co3 units. Magnetic studies for compounds 1 and 2 demonstrate an antiferromagnetic coupling between the adjacent Co(Ⅱ) centers.
Keywords: coordination polymer  hydrogen bonding  tricarboxylic acid  magnetic properties
投稿时间:2016-09-30 修订日期:2016-12-02
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