Two cobalt(II) coordination polymers [Co2(H2O)4(Hbidc)2]n and [Co(Hbidc)]n (Hbidc = 1H-benzimidazole-5,6-dicarboxylate): syntheses, crystal structures, and magnetic properties
Two cobalt(II) coordination polymers [Co2(H2O)4(Hbidc)2]n and [Co(Hbidc)]n (Hbidc = 1H-benzimidazole-5,6-dicarboxylate): syntheses, crystal structures, and magnetic properties
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DOI：
10.1039/b815464c
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发表时间：
2009-05
期刊：
影响因子：
3.1
通讯作者：
Yongqin Wei;Yunfang Yu;Rongjian Sa;Qiaohong Li;Kechen Wu
中科院分区：
文献类型：
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作者：
Yongqin Wei;Yunfang Yu;Rongjian Sa;Qiaohong Li;Kechen Wu
分别在160 ° C和220 °C水热条件下合成了两种新型钴（II）配位聚合物[Co2（H2O）4（Hbidc）2]n（1）和[Co（Hbidc）]n（2）（Hbidc = 1H-苯并咪唑-5，6-二羧酸酯）. X射线衍射分析表明，化合物1为一维链状聚合物，具有二聚体单元[Co2（H2O）4（Hbidc）2]，其无限长链在三维超分子骨架中均匀地向晶体学a轴方向排列，未配位的羧基氧原子与咪唑环上的配位水分子或N-H基团之间具有丰富的氢键相互作用。化合物2是一种新的五配位钴（II）链化合物，其显示出具有沿晶体学b轴沿着平行的拉链状羧酸钴链的2-D聚合物网络，并且化合物2的2-D聚合物网络显示出层状排列，其中咪唑环中未配位的羧基氧原子和N-H基团之间的强氢键相互作用在最终的3-D超分子结构。磁性研究表明，化合物1的二聚体单元中的两个CoII离子之间显示出铁磁耦合，化合物2表现出反铁磁性质。
Two novel cobalt(II) coordination polymers [Co2(H2O)4(Hbidc)2]n (1) and [Co(Hbidc)]n (2), (Hbidc = 1H-benzimidazole-5,6-dicarboxylate) were synthesized hydrothermally by treating CoSO4 and H3bidc at 160 or 220 °C, respectively. X-Ray diffraction analyses showed that compound 1 is a 1-D chain polymer with dimer units [Co2(H2O)4(Hbidc)2] and the infinite chains of compound 1 array uniformly towards the crystallographic a-axis in a 3-D supramolecular framework which possesses abundant hydrogen-bonding interactions between uncoordinated carboxylo-oxygen atoms and coordinated water molecules or N–H groups in imidazole rings. Compound 2 is a novel five-coordinated cobalt(II) chain compound exhibiting a 2-D polymeric network with parallel zip-like cobalt–carboxylate chains along the crystallographic b-axis and the 2-D polymeric networks of compound 2 exhibit a layered arrangement, in which the strong hydrogen-bonding interaction between uncoordinated carboxylo-oxygen atoms and N–H groups in the imidazole rings play a key role in the final 3-D supramolecular architectures. Magnetic studies revealed that compound 1 shows a ferromagnetic coupling between two CoII ions in the dimer unit and compound 2 exhibits an antiferromagnetic property.