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Design and synthesis of three new copper coordination polymers: efficient degradation of an organic dye at alkaline pH
Dalton Transactions ( IF 4 ) Pub Date : 2021-08-20 , DOI: 10.1039/d1dt02463a
Xiaxia Liu 1, 2 , Liping Lu 1 , Miaoli Zhu 1, 2 , Ulli Englert 1, 3
Affiliation  

Three new coordination polymers (CPs) based on Cu(II), namely {[Cu6(H2L)4(4,4′-bpy)6(H2O)2]·16H2O}n(1), {[Cu(H3L)(1,4-bib)]·3H2O}n(2), and {[Cu2(H2L)2(1,4-bib)2][Cu(1,4-bib)(H2O)2]}n·4nH2O(3) (H5L = 6-(3′,4′-dicarboxyphenoxy)-2,3,5-benzene tricarboxylic acid, 4,4′-bpy = 4,4′-bipyridine and 1,4-bib = 1,4-bis(1H-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 {4·52}2{42·54·64·83·92}{5·104·12} 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)(H2O)2]n2+ (3a) represents a chain polymer and the second anionic moiety [Cu2(H2L)2(1,4-bib)2]n2− (3b) corresponds to a 2D sub-structure. In the presence of H2O2, 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 H2O2 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.

中文翻译:

三种新型铜配位聚合物的设计与合成:在碱性 pH 下有效降解有机染料

三种基于Cu( II )的新型配位聚合物(CPs) ,即{[Cu 6 (H 2 L) 4 (4,4'-bpy) 6 (H 2 O) 2 ]·16H 2 O} n ( 1 ) , {[Cu(H 3 L)(1,4-bib)]·3H 2 O} n ( 2 ), {[Cu 2 (H 2 L) 2 (1,4-bib) 2 ][Cu( 1,4-bib)(H 2 O) 2 ]} n ·4nH 2 O( 3 ) (H 5L = 6-(3',4'-二羧基苯氧基)-2,3,5-苯三羧酸,4,4'-bpy = 4,4'-联吡啶和 1,4-bib = 1,4-bis( 1 H-咪唑-1-基)苯)在水热条件下合成并表征。1采用三维结构,可以用点符号 {4·5 2 } 2 {4 2 ·5 4 ·6 4 ·8 3 ·9 2 }{5·10 4 ·12} 来描述,而2表示一个分层结构。3可被视为两种配位聚合物的络盐:阳离子组分 [Cu(1,4-bib)(H 2 O) 2 ] n2+ ( 3a )表示链状聚合物,第二阴离子部分[Cu 2 (H 2 L) 2 (1,4-bib) 2 ] n 2- ( 3b )对应于2D亚结构。在 H 2 O 2存在下,所有配合物1-3都可作为降解染料亚甲蓝 (MB) 的有效光催化剂。还详细研究和分析了初始MB浓度、催化剂用量、pH值和H 2 O 2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,可重复使用至少 3 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质。
更新日期:2021-09-15
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