Structural diversity in new coordination polymers modulated by semirigid ether-linked pyridine-phthalate building block and ancillary ligands: syntheses, structures, and luminescence properties
作者:Li-Zi Yang、Ran Fang、Wei Dou、Alexander M. Kirillov、Cai-ling Xu、Wei-Sheng Liu
DOI:10.1039/c5ce00341e
日期:——
Seven new 2D or 3D coordination polymers based on the flexible and semirigid pyridine-phthalate building block H2pbda (3-(pyridin-3-yloxy)benzene-1,2-dicarboxylic acid), namely 3D [Cd(pbda)]n (1), 3D [Cd3(OH)2(pbda)2]n (2), 3D [Cd(pbda)(4,4′-bpy)]n (3), 3D [Co(pbda)(4,4′-bpy)]·2H2O}n (4), 2D [Zn(pbda)(1,4-bib)]·H2O}n (5), 2D [Cd(pbda)(1,4-bib)]·H2O}n (6), and 3D [Co(pbda)(4,4′-bibp)]·2H2O}n (7), were prepared by hydrothermal reactions in the presence (optional) of an ancillary ligand selected from 4,4′-bpy (4,4′-bipyridine), 1,4-bib (1,4-bis(imidazol)butane), or 4,4′-bibp (bis(benzimidazol)propane). Compounds 1–7 were fully characterized and their crystal structures were classified from the topological viewpoint, resulting in the following topological networks: gis in 1, crb in 2, ins in 3 and 7, fsc-3,4-C2/c in 4, and sql in 5 and 6. The results revealed that the crystal architectures and the coordination modes of pbda building blocks are influenced by various factors, including the nature of metal cations, the solution pH, the temperature, and the presence of N-donor ancillary ligands. In addition, TGA data show that almost all compounds are thermally stable up to 300 °C. Zn(II) and Cd(II) derivatives are also strong luminescent emitters.
以柔性和半刚性的吡啶-酞酸盐构筑单元H2pbda(3-(吡啶-3-基氧)苯-1,2-二羧酸)为基础,通过水热反应制备了七种新的二维或三维配位聚合物,即三维[Cd(pbda)]n(1)、三维[Cd3(OH)2(pbda)2]n(2)、三维[Cd(pbda)(4,4′-联吡啶)]n(3)、三维[Co(pbda)(4,4′-联吡啶)]·2H2O}n(4)、二维[Zn(pbda)(1,4-联咪唑)]·H2O}n(5)、二维[Cd(pbda)(1,4-联咪唑)]·H2O}n(6)和三维[Co(pbda)(4,4′-联苯咪唑)]·2H2O}n(7),其中在反应中根据需要加入了4,4′-联吡啶、1,4-联咪唑或4,4′-联苯咪唑等辅助配体。化合物1-7均得到了充分表征,并从拓扑学角度对其晶体结构进行了分类,得到了以下拓扑网络:1为gis,2为crb,3和7为ins,4为fsc-3,4-C2/c,5和6为sql。结果表明,晶体结构和pbda构筑单元的配位模式受到多种因素的影响,包括金属阳离子的性质、溶液pH值、温度以及N供体辅助配体的存在。此外,热重分析数据表明,几乎所有化合物的热稳定性均高达300 °C。Zn(II)和Cd(II)衍生物也是强发光体。