Synthesis, structure and photocatalytic properties of coordination polymers based on pyrazole carboxylic acid ligands,CrystEngComm

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Synthesis, structure and photocatalytic properties of coordination polymers based on pyrazole carboxylic acid ligands
CrystEngComm ( IF 2.6 ) Pub Date : 2020-09-15 , DOI: 10.1039/d0ce01054e
Chen-Lan Lin _{1,

2,

3,

4} , Yan-Fei Chen _{1,

2,

3,

4} , Li-Juan Qiu _{1,

2,

3,

4} , Binglong Zhu _{1,

2,

3,

4} , Xin Wang _{1,

2,

3,

4} , Shi-Peng Luo _{1,

2,

3,

4} , Wenyan Shi _{4,

5,

6,

7,

8} , Ting-Hai Yang _{1,

2,

3,

4} , Wu Lei _{4,

8,

9,

10}

Affiliation

Three new compounds, namely, [Mn(hpcH)(H₂O)₂]·H₂O (1), [Cd(hpcH)(DMF)(H₂O)] (2), [Cu(hpcH₂)₂(H₂O)₂] (3), (hpcH₃ = 5-hydroxy-1H-pyrazole-3-carboxylic acid) were solvothermally synthesized and characterized in detail. Compounds 1 and 2 are coordination polymers (CPs), exhibit two-dimensional (2D) layered structures and crystallize in monoclinic lattices with the C₂/c and P2₁/c space groups, respectively. Compound 3 shows a 3D supramolecular structure constructed from six-coordinated mononuclear Cu²⁺ through hydrogen bonds and π–π stacking interactions. The hpcH₃ ligand behaved in different coordinated modes in the three compounds. It lost two protons in compounds 1 and 2 and one proton in compounds 3. Furthermore, the photocatalytic degradation properties of compounds 1 and 2 were investigated. The results indicate that 1 and 2 show excellent photocatalytic activities for methylene blue (MB) under visible light. The photocatalytic degradation efficiency of 2 reached 96.7% in 90 minutes. The possible photocatalytic mechanisms displayed by CPs 1–2 for the photodegradation of MB have been addressed through the trapping experiment and theoretical calculations.

中文翻译：

基于吡唑羧酸配体的配位聚合物的合成，结构和光催化性能

三种新化合物，即[Mn（hpcH）（H ₂ O）₂ ]·H ₂ O（1），[Cd（hpcH）（DMF）（H ₂ O）]（2），[Cu（hpcH ₂）溶剂热合成₂（H ₂ O）₂ ]（3），（hpcH ₃＝ 5-羟基-1 H-吡唑-3-羧酸）并详细表征。化合物1和2为配位聚合物（CP），具有二维（2D）分层结构，并在单斜晶格中以C ₂ / c和P结晶2个₁ / c空间组。化合物3显示了6D配位的单核Cu ²⁺通过氢键和π-π堆积相互作用构造的3D超分子结构。hpcH ₃配体在三种化合物中表现出不同的配位模式。它在化合物1和2中损失了两个质子，在化合物3中损失了一个质子。此外，研究了化合物1和2的光催化降解性能。结果表明1和2在可见光下对亚甲基蓝（MB）具有优异的光催化活性。的光催化降解效率2在90分钟内达到96.7％。通过捕获实验和理论计算已经解决了CP 1–2显示的可能的光催化机理，用于MB的光降解。

更新日期：2020-10-02

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