通过溶剂热法合成了2个二维钴配位聚合物[Co2(1,4-bib)2(5-hipa)2]n(1)(5-H2hipa=5-hydroxyisophthalic acid,1,4-bib=1,4-bis(1-imidazolyl)benzene),[Co (Hbpt) (4,4′-bidpe)]n (2) (H3bpt =biphenyl-4,4′,5-tricarboxylic acid,4,4′-bidpe =4,4′-bis (imidazol-1-yl)diphenyl ether).X射线单晶衍射实验测定和结构解析结果表明,配合物1、2中5-hipa2-、Hbpt2配体的2个相间羧基将相邻的Co2+连接形成含有Co2O4C2八元环和Co2O4C10十六元环的一维链状结构.一维链之间通过1,4-bib,4,4′-bidpe配体上的咪唑基N原子与相邻Co(Ⅱ)离子配位连结形成二维层状结构.配合物1层与层之间通过相邻层中的5-hipa2-配体的羟基与羧基的分子间氢键连结形成三维超分子网络结构.配合物2中,Hbpt配体的羧基氢与层内的相邻链上参与弱配位羧基氧形成层内氢键.电化学性能测试结果表明,配合物1对氧还原反应具有电催化活性.%Two new metal-organic coordination polymers,[Co2(1,4-bib)2(5-hipa)2]n (1) (5-H2hipa=5-hydroxyisophthalic acid,1,4-bib=1,4-bis(1-imidazolyl)benzene),[Co(Hbpt)(4,4′-bidpe)]n(2) (H3bpt=biphenyl-3,4′,5-tricarboxylic acid,4,4′-bidpe=4,4′-bis(imidazol-1-yl)diphenyl ether) were obtained under solvothermal conditions and characterized structurally.The meta benzenedicarboxylates in 5-hipa2-and Hbpt2-connect the Co(Ⅱ) ions into 1D carboxylate-cobalt chain structures with 8-membered ring Co2O4C2 and 16-membered Co2O4C10 ring alternately.And the bis(imidazole) ligands further link the adjacent 1D carboxylate-cobah chains to construct an interesting two-dimensional layered structure,respectively.The adjacent layers [Co2 (1,4-bib)2 (5-hipa)2] in complex 1 are linked with each other by hydrogen bonding to generate an interesting 3D supramolecular framework.While the hydrogen bonding only exits within the layers of 2.Furthermore,the complex 1/Vulcan XC-72R composite can catalyze the oxygen reduction reaction through a 2e/4e mixed reduction pathway.CCDC:1576263,1;1576262,2.
展开▼
