A pillar-layer strategy to construct 2D polycatenated coordination polymers for luminescence detection of Cr2O72- and CrO42- in aqueous solution
A pillar-layer strategy to construct 2D polycatenated coordination polymers for luminescence detection of Cr2O72- and CrO42- in aqueous solution
复制标题
柱层策略构建二维多链配位聚合物用于水溶液中 Cr2O72− 和 CrO42− 的发光检测
作者：
Long Bing-Fan;Wang Meng-Fan;Huang Qin;Yin Xian-Hong;Young David James;Hu Fei-Long;Mi Yan
采用棒环策略合成了六种配位聚合物1-6，其中H_2L配体为环，N-给体配体(bpp、1，4-bimb、1，3-bimb、bpb、bpdp和bpeb；bpp=1，3-二(吡啶-4-基)丙烷；1，4-BIMB=1，4-双(1H-咪唑-1-基)甲基)苯；1，3-BIMB=1，3-双(1H-咪唑-1-基)甲基)苯；Bpdp=1，4-双(4-吡啶)-2，3-二氮-1，3-丁二烯；bpeb=1，4-双[2-(4-吡啶)乙烯基]苯。除了6个以外，所有的复合体都具有双核次级建筑单元(SBU)，并显示出相同的拓扑结构。在化合物1-4中，两个桨轮锌单元通过两个L配体连接形成菱形的[锌L2]单元，这些单元扩展成链状基序。N-施主配体支持链状结构，并扩展为2D层。三层相互渗透形成2D+2D→2D多链骨架。通过氢键和非常规相互作用，2D多链层被进一步填充成3D结构。化合物6具有由四重互穿网络组成的三维柱层结构。这种配位聚合物的完全解溶结构的可及体积为38%，并显示出强烈的荧光，在低浓度的水溶液中可被CrVI离子选择性猝灭。
Six coordination polymers 1–6 were constructed using a rod and loop strategy, in which the H2L ligand served as the loop and the N-donor ligands (bpp, 1,4-bimb, 1,3-bimb, bpb, bpdp and bpeb; bpp = 1,3-di(pyridin-4-yl)propane; 1,4-bimb = 1,4-bis((1H-imidazol-1-yl)methyl)benzene; 1,3-bimb = 1,3-bis((1H-imidazol-1-yl)methyl)benzene; bpb = 1,4-di(pyridin-4-yl)benzene; bpdp = 1,4-bis(4-pyridyl)-2,3-diaza-1,3-butadiene; bpeb = 1,4-bis[2-(4-pyridyl)ethenyl]benzene) acted as the rods. All the complexes except 6 possessed binuclear secondary building units (SBUs) and displayed the same topologies. In compounds 1–4, two paddle-wheel Zn2 units were linked by two L ligands to form rhombic [Zn4L2] units and these units propagated into a chain-like motif. The N-donor ligands supported the chain-like structure and expanded into 2D layers. Three layers were interpenetrated forming a 2D + 2D → 2D polycatenation backbone. The 2D polycatenation layers were further packed into a 3D structure by hydrogen bonds and unconventional interactions. Compound 6 showed a 3D pillar-layer structure consisting of a four-fold interpenetrated network. This coordination polymer had an accessible volume of 38% for the fully desolvated structure and exhibited strong fluorescence that was selectively quenched by CrVI ions in aqueous solution at low concentrations.