基于2,4′-二羧基二苯甲酮构筑的具有一维梯状链和一维隧道的三维超分子体系

采用水热法设计合成了两个新型三维超分子化合物H₂L·H₂O (1)和Ag(bpy)₂]·HL·H₂O (2) (其中bpy=2,2'-联吡啶, H₂L=2,4′-二羧基二苯甲酮)，晶体结构分析表明，它们均是通过氢键采用不同的连接方式拓展而成。其中，化合物1 是2,4′-二羧基二苯甲酮和水分子通过O–H···O氢键形成的一维梯状链扩展构筑的三维超分子体系；化合物2 则是2,4′-二羧基二苯甲酮和水分子通过两种氢键形成含有一维隧道的三维超分子体系。有趣的是，Ag(bpy)₂]⁺ 阳离子通过π–π 堆积和弱的Ag···Ag相互作用连在一起，进而以客体形式填充其中。荧光性质研究表明，由于存在bpy的螯合与堆积效应，化合物2相比配体和化合物1，其荧光发射峰发生红移。

1D Ladder‐like Chain and 1D Channeled 3D Supramolecular Architectures Based on Benzophenone‐2,4′‐dicarboxylic Acid

The hydrothermal reactions of AgNO₃, 2,2′‐bipyridyl, and benzophenone‐2,4′‐dicarboxylic acid gave rise to two 3D supramolecular architectures, namely H₂L·H₂O ( 1 ), Ag(bpy)₂]·HL·H₂O ( 2 ) (bpy?2,2′‐bipyridyl, H₂L?benzophenone‐2,4′‐dicarboxylic acid). The two compounds are extended by hydrogen bonds in two different approaches. In the case of 1 , one‐dimensional ladder‐like structure is firstly formed through O–H···O hydrogen bonding between H₂L ligands and water molecules, then extended to a 3D supramolecular architecture. Compound 2 possesses 3D supramolecular architecture containing 1D open channels, which are driven due to the strong H‐bonding interactions occurring between the HL anions and water molecules; interestingly, Ag(bpy)₂]⁺ cations are linked together through π‐π interactions between bpy ligands and weak Ag···Ag interactions, and then reside in these channels by C–H···O hydrogen‐bond. The photoluminescence properties of these compounds were also investigated, the emission maxima for 2 exhibits red‐shift compared with that of free ligand and 1 due to chelating effect of the 2,2′‐bipyridine ligand to the silver ion and the presence of aromatic π‐packing.