Liu Xiaxia, Lu Liping, Zhu Miaoli, Englert Ulli
Institute of Molecular Science, Key Laboratory of Chemical Biology and Molecular Engineering of the Education Ministry, Shanxi University, Taiyuan, Shanxi 030006, People's Republic of China.
Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province; Shanxi University, Taiyuan, Shanxi 030006, People's Republic of China.
Dalton Trans. 2021 Oct 12;50(39):13866-13876. doi: 10.1039/d1dt02463a.
Three new coordination polymers (CPs) based on Cu(II), namely {[Cu(HL)(4,4'-bpy)(HO)]·16HO}(1), {[Cu(HL)(1,4-bib)]·3HO}(2), and {[Cu(HL)(1,4-bib)][Cu(1,4-bib)(HO)]}·4nHO(3) (HL = 6-(3',4'-dicarboxyphenoxy)-2,3,5-benzene tricarboxylic acid, 4,4'-bpy = 4,4'-bipyridine and 1,4-bib = 1,4-bis(1-imidazol-1-yl)benzene) were synthesized under hydrothermal conditions and characterized. 1 adopts a three-dimensional structure and can be described with the point symbol {4·5}{4·5·6·8·9}{5·10·12} whereas 2 shows a layered structure. 3 can be perceived as a complex salt of two coordination polymers: the cationic component [Cu(1,4-bib)(HO)] (3a) represents a chain polymer and the second anionic moiety [Cu(HL)(1,4-bib)] (3b) corresponds to a 2D sub-structure. In the presence of HO, all complexes 1-3 act as efficient photocatalysts for the degradation of the dye methylene blue (MB). The effects of properties such as initial MB concentration, catalyst dosage, pH value, and HO concentration on MB degradation were also investigated and analyzed in detail. Compounds 1-3 exhibit excellent structural stability during the catalytic process and can be reused at least three times. The hydroxyl radical (OH˙) and holes (h) were confirmed as the main active species in the degradation process.
基于铜（II）合成了三种新型配位聚合物（CPs），即{[Cu(HL)(4,4'-bpy)(H₂O)]·16H₂O}(1)、{[Cu(HL)(1,4-bib)]·3H₂O}(2)和{[Cu(HL)(1,4-bib)][Cu(1,4-bib)(H₂O)]}·4nH₂O(3)（HL = 6-(3',4'-二羧基苯氧基)-2,3,5-苯三甲酸，4,4'-bpy = 4,4'-联吡啶，1,4-bib = 1,4-双(1-咪唑-1-基)苯），并在水热条件下对其进行了表征。1具有三维结构，可用点符号{4·5}{4·5·6·8·9}{5·10·12}描述，而2呈现层状结构。3可视为两种配位聚合物的复合盐：阳离子组分[Cu(1,4-bib)(H₂O)] (3a)代表链状聚合物，第二个阴离子部分[Cu(HL)(1,4-bib)] (3b)对应二维子结构。在H₂O₂存在下，所有配合物1 - 3对染料亚甲基蓝（MB）的降解均表现为高效光催化剂。还详细研究和分析了初始MB浓度、催化剂用量、pH值和H₂O₂浓度等性质对MB降解的影响。化合物1 - 3在催化过程中表现出优异的结构稳定性，且至少可重复使用三次。羟基自由基(OH˙)和空穴(h⁺)被确认为降解过程中的主要活性物种。
