Synthesis, structural characterization and properties of Ag(i)-complexes based on double-armed 1,3,4-oxadiazole bridging ligands
作者:Gui-Ge Hou、Yan Wu、Jian-Ping Ma、Yu-Bin Dong
DOI:10.1039/c1ce05718a
日期:——
Four semirigid symmetric double-armed oxadiazole bridging ligands L1–L4 were designed and synthesized in good yields by reactions of 2,5-bis(2-hydroxyphenyl)-1,3,4-oxadiazole and 2,5-bis(3-hydroxyphenyl)-1,3,4-oxadiazole with 3-(bromomethyl)benzonitrile and 4-(bromomethyl)benzonitrile, respectively. The coordination chemistry of these four ligands with various Ag(I) salts has been investigated. Eleven discrete, one- and two-dimensional polymeric Ag(I) complexes (1–11) were prepared by solution reactions and characterized by infrared spectroscopy, elemental analysis, and single-crystal X-ray diffraction. Compared to our reported ligands of this type, L1–L4 are more flexible. The ligand conformation and polyatomic anion templating effect play a key role in determining the final supramolecular structures. Compound 6 contains 3D intersecting channels with different interior microenvironments. It can absorb two different types of guest molecules (benzene and THF) independently or take them up simultaneously from a mixture of two kinds of guests. Furthermore, it can completely separate THF/furan and benzene/toluene guest substrates in liquid phase, respectively.
通过 2,5-双(2-羟基苯基)-1,3,4-恶二唑和 2,5-双(3-羟基苯基)-1,3,4-恶二唑分别与 3-(溴甲基)苯腈和 4-(溴甲基)苯腈的反应,设计并合成了四种半刚性对称双臂噁二唑桥接配体 L1-L4,并获得了良好的产率。研究了这四种配体与各种 Ag(I) 盐的配位化学。通过溶液反应制备了 11 种离散的一维和二维聚合物 Ag(I) 复合物(1-11),并通过红外光谱、元素分析和单晶 X 射线衍射对其进行了表征。与已报道的此类配体相比,L1-L4 更为灵活。配体构象和多原子阴离子模板效应在决定最终超分子结构方面起着关键作用。化合物 6 包含具有不同内部微环境的三维交叉通道。它可以独立吸收两种不同类型的客体分子(苯和四氢呋喃),也可以从两种客体分子的混合物中同时吸收它们。此外,它还能在液相中分别完全分离 THF/呋喃和苯/甲苯客体基质。