W18O49/NH2-UiO-66复合催化剂的高效光催化CO2环加成
程若霖, 王浩然, 任静, 马莹莹, 梁华根
【无机化学学报】doi: 10.11862/CJIC.20230349
以2-氨基对苯二甲酸(H2ATA)为配体,通过溶剂热法合成了Zr基MOF:NH2-UiO-66,继而以氯化钨为前驱体,通过溶剂热法实现了富含氧空位的缺陷氧化钨(W18O49)在NH2-UiO-66上的原位生长,构建了具有典型Ⅱ型异质结的复合光催化剂W18O49/NH2-UiO-66。通过粉末X射线衍射、扫描电子显微镜、X射线光电子能谱和紫外可见漫反射光谱对催化剂的组成与结构进行了表征。在室温常压、模拟太阳光下,以氧化苯乙烯为模型底物,对所有样品的光催化活性进行了考察,W18O49/NH2-UiO-66展现了最高的碳酸苯乙烯酯产率(58 mmol·g-1·h-1)。
关键词: CO2环加成, 光催化, W18O49, 金属有机骨架
Design, synthesis, and fluorescence sensing performance of highly sensitive and multi-response lanthanide metal-organic frameworks
Ruikui YAN, Xiaoli CHEN, Miao CAI, Jing REN, Huali CUI, Hua YANG, Jijiang WANG
【无机化学学报】doi: 10.11862/CJIC.20230301
Based on the 5-(3, 4-dicarboxyphenoxy) isophthalic acid (H4dppa) ligand, two lanthanide metal-organic frameworks (Ln-MOFs) were designed and synthesized by hydrothermal synthesis: {(dima)[Dy(dppa)(H2O)2]·2.5H2O}n (Dy - MOF) and {(dima) [Eu(dppa) (H2O)2]·1.5H2O}n (Eu - MOF) (dima=dimethylamine cation). The structures were characterized by elemental analysis, infrared spectroscopy, single-crystal X-ray diffraction, etc. Dy-MOF and Eu- MOF are hetero-isomorphic 2D network structures, and adjacent 2D networks further form 3D supramolecular network structures through hydrogen bonding. Fluorescence analysis shows that Dy-MOF and Eu-MOF have excellent fluorescence properties at room temperature, and Dy-MOF has excellent fluorescence sensing properties, which can efficiently and high-sensitively detect a variety of pollutants in water: aniline (ANI), nitrobenzene (NB), tetracycline (TC), pyrimethanil (PTH), and tryptophan (Trp). The fluorescence quenching mechanism of Dy-MOF in detecting pollutants was also investigated.
关键词: lanthanide metal-organic frameworks, 5-(3, 4-dicarboxyphenoxy) isophthalic acid, crystal structure, fluorescence sensing
Synthesis and fluorescence sensing of a highly sensitive and multi-response cadmium coordination polymer
Jing REN, Ruikui YAN, Xiaoli CHEN, Huali CUI, Hua YANG, Jijiang WANG
【无机化学学报】doi: 10.11862/CJIC.20240287
A coordination polymer {[Cd(H2dpa)(bpy)]·3H2O}n (Cd-CP) was designed and hydrothermal synthesized based on 4-(2, 4-dicarboxyphenoxy) phthalic acid (H4dpa), 2, 2′-bipyridine (bpy) and Cd(NO3)2·4H2O. The structure was characterized by single-crystal X-ray diffraction, powder X-ray diffraction, elemental analysis, and infrared spectroscopy. Cd-CP belongs to the monoclinic crystal system with the P21/c space group and performs in a 1D double-chain structure. The adjacent double chains further form a 3D supramolecular network structure through hydrogen bonding. Thermogravimetric analysis shows that Cd-CP has good thermal stability. Fluorescence analysis showed that Cd-CP had good choosing selectively and was sensitive to metal ions (Fe3+ and Zn2+), 2, 4, 6-trinitrophenylhydrazine (TRI), and pyrimethanil (Pth). Interestingly, when Cd-CP was used for fluorescence detection of metal ions, it was found to have a fluorescence quenching effect on Fe3+ but had an obvious enhancement effect on Zn2+. Therefore, we designed an "on-off-on" logic gate. In addition, the mechanism of fluorescence sensing has been deeply explored.
关键词: coordination polymer, 4-(2, 4-dicarboxyphenoxy) phthalic acid, fluorescence sensing, logic gate
Highly sensitive and multi-response Zn-MOF fluorescence sensor: Design, synthesis, and detection of 4-nitrophenol, Cu2+, and pyrimethanil
Fan LIU, Xiaoli CHEN, Jing REN, Yantao LEI, Huali CUI, Hua YANG, Jijiang WANG
【无机化学学报】doi: 10.11862/CJIC.20250287
Based on 4′-(1H-tetrazol-5-yl)-[1, 1′-biphenyl]-2, 4, 6-tricarboxylic acid (H4bta) ligand, zinc metal-organic framework (Zn-MOF): {[Zn2(bta)(bpy)2(H2O)]·1.5H2O}n (bpy=2, 2′-bipyridine) was designed and synthesized by hydrothermal method. Its structure was characterized by elemental analysis, IR spectra, X-ray single crystal diffraction, etc. The asymmetric unit of Zn-MOF contains two crystallographically independent Zn2+ ions. Through the connection of Zn2+ ions via H4bta, a 1D double-layer network structure is formed. Adjacent double-layer networks further form a 2D supramolecular network through hydrogen bonding. Notably, Zn-MOF exhibited excellent fluorescence properties and could efficiently and sensitively detect various water pollutants: 4-nitrophenol (4-NP), Cu2+, and pyrimethanil (Pth). Additionally, the mechanism of fluorescence sensing was investigated.
关键词: 4'-(1H-tetrazol-5-yl)-[1, 1'-biphenyl]-2, 4, 6-tricarboxylic acid, crystal structure, fluorescence sensing

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