化学
铜
三角双锥分子几何
共价键
水溶液
无机化学
配位复合体
电子顺磁共振
氯化物
金属化
高分子化学
分子
有机化学
金属
核磁共振
物理
作者
Panagiota Bika,Nikolaos Ioannidis,Maria-Anna Gatou,Yiannis Sanakis,Panagiotis Dallas
出处
期刊:Langmuir
[American Chemical Society]
日期:2022-03-03
卷期号:38 (10): 3082-3089
被引量:2
标识
DOI:10.1021/acs.langmuir.1c02910
摘要
In this work, we reveal the coordination of copper ions absorbed by a series of covalent organic frameworks. The frameworks were synthesized through the nucleophilic substitution of either cyanuric chloride or phosphonitrilic chloride trimer by 4,4'-bipyridine, and they were utilized as absorbers for the removal of copper ions from aqueous solutions. The exfoliated counterpart of the layered network was compared to the bulk materials in terms of the copper retention capacity and efficiency. The ion absorption capacity of copper ranged from 100 to 290 mg/g depending on the morphology and chemical structure of the framework. As evidenced by the SEM and XRD analysis, the copper absorption induced certain morphological changes in the networks. EPR spectroscopy revealed the key finding of this study: the trigonal bipyramidal configuration of the copper ions in their divalent state, coordinated with the nitrogen of the core units, 4,4'-bipyridine, and chlorine ions. The analysis of the thoroughgoing experiments bridges the gap between coordination molecular chemistry and the field of covalent organic frameworks. EPR explores how the unique trigonal bipyramidal coordination could be suppressed in the end by the environment and, more specifically, by the addition of glycerol to the aqueous dispersions of the covalent organic frameworks.
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