Seven novel coordination polymers constructed by rigid 4-(4-carboxyphenyl)-terpyridine ligands: synthesis, structural diversity, luminescence and magnetic properties
作者:Peng Yang、Meng-Si Wang、Jin-Jin Shen、Ming-Xing Li、Zhao-Xi Wang、Min Shao、Xiang He
DOI:10.1039/c3dt52500g
日期:——
Seven coordination polymers, namely [Mn(4-cptpy)2]n (1), [Co(4-cptpy)2]n (2), [Mn3(4-cptpy)6(H2O)]n·2nH2O (3), [Co(4-cptpy)(HCOO)(H2O)]n·nDMF (4), [Zn2(4-Hcptpy)2Cl4]n·2nC2H5OH·nH2O (5), [Co4(3-cptpy)4(HCOO)4(H2O)2]n (6), and [Mn(3-cptpy)2]n (7) (4-Hcptpy = 4-(4-carboxyphenyl)-4,2′:6′,4′′-terpyridine; 3-Hcptpy = 4-(4-carboxyphenyl)-3,2′:6′,3′′-terpyridine), have been synthesized under hydro(solvo)thermal conditions and structurally characterized. A general solvothermal method is proposed for preparing carboxylate complexes in DMF solution without any basic additive. 1 and 2 possess isostructural 3D metal–organic frameworks containing nanosized cavities. 3 is a beautiful 2D coordination polymer assembled by flower-like Mn3(4-cptpy)6(H2O) subunits. 4 and 6 both display 2D polymeric networks constructed from 4/3-cptpy− ligands, in which the formate ligands originate from the hydrolysis of DMF. 5 is a 1D 21 helical chain polymer. 7 shows a 2D network with a (3.6) two-nodal kgd topology. 4/3-Hcptpy ligands display seven types of coordination modes. The zinc complex 5 emits strong violet luminescence. 1 and 2 are both thermally stable below 440 °C and exhibit antiferromagnetic interactions.
七种配位聚合物,即[Mn(4-cptpy)2]n (1)、[Co(4-cptpy)2]n (2)、[Mn3(4-cptpy)6(H2O)]n-2nH2O (3)、[Co(4-cptpy)(HCOO)(H2O)]n-nDMF (4)、4)、[Zn2(4-Hcptpy)2Cl4]n-2nC2H5OH-nH2O(5)、[Co4(3-cptpy)4(HCOO)4(H2O)2]n(6)和[Mn(3-cptpy)2]n(7)(4-Hcptpy = 4-(4-羧基苯基)-4,2′:6′,4′′-三吡啶;3-Hcptpy = 4-(4-羧基苯基)-3,2′:6′,3′′-三吡啶)在氢(溶)热条件下合成,并进行了结构表征。提出了一种在 DMF 溶液中制备羧酸配合物的通用溶解热方法,无需任何碱性添加剂。1 和 2 具有等结构的三维金属有机框架,包含纳米级空腔。3 是一种美丽的二维配位聚合物,由花朵状的 Mn3(4-cptpy)6(H2O) 亚基组装而成。4 和 6 都显示了由 4/3-cptpy- 配体构建的二维聚合物网络,其中的甲酸配体来自 DMF 的水解。5 是一种 1D 21 螺旋链聚合物。7 显示的是具有 (3.6) 双节点 kgd 拓扑结构的二维网络。4/3-Hcptpy 配体显示出七种配位模式。锌配合物 5 发出强烈的紫色荧光。1 和 2 的热稳定性均低于 440 ℃,并表现出反铁磁性相互作用。