Coordination Polymers in Selective Separation of Cations and Anions: A Series of Rarely Observed All Helical Three-Dimensional Coordination Polymers Derived from Various Chiral Amino Acid Based Bis-pyridyl-bis-amide Ligands

A series of CuII coordination polymers [{Cu(μL1)2Br2}·2H2O]∞ CP1, [{Cu(μL2)2·H2O·Br}·Br·4H2O]∞ CP2, [{Cu(μL3)2Br2}·2H2O]∞ CP3, [{Cu(μL3)2Cl2}·2H2O]∞ CP4, derived from bis-pyridyl-bis-amide ligands having a natural l-amino acid backbone have been synthesized and characterized by single crystal X-ray diffraction. Environmentally relevant cations (CuII) and anions (Br–) have been separated selectively from complex mixtures of cations (CuII, CoII, and ZnII) and anions (Br–, NO3–, SO42–, ClO4– and BF4–) via an in situ crystallization technique in separate experiments, respectively. Such separation of cations by in situ crystallization of coordination polymers represents the first example in the literature.

一系列以带有天然L-氨基酸骨架的双吡啶双酰胺配体为配体的铜(II)配位聚合物[{Cu(μ-L1)₂Br₂}·2H₂O]∞ CP1、[{Cu(μ-L2)₂·H₂O·Br}·Br·4H₂O]∞ CP2、[{Cu(μ-L3)₂Br₂}·2H₂O]∞ CP3、[{Cu(μ-L3)₂Cl₂}·2H₂O]∞ CP4已被合成，并通过单晶X射线衍射完成表征。在两组独立实验中，分别通过原位结晶技术，从包含阳离子（CuII、CoII和ZnII）与阴离子（Br–、NO3–、SO42–、ClO4–和BF4–）的复杂混合体系中，选择性分离出环境相关的阳离子（CuII）和阴离子（Br–）。此类通过配位聚合物原位结晶实现阳离子分离的策略，在已发表的文献中尚属首例。