A functionalized UiO-66 MOF for turn-on fluorescence sensing of superoxide in water and efficient catalysis for Knoevenagel condensation
Autor: | Nagaraj Anbu, Amarajothi Dhakshinamoorthy, Shyam Biswas, Aniruddha Das, Mostakim Sk |
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Rok vydání: | 2019 |
Předmět: |
Terephthalic acid
010405 organic chemistry Chemistry Substrate (chemistry) 010402 general chemistry Heterogeneous catalysis 01 natural sciences Combinatorial chemistry 0104 chemical sciences Catalysis Inorganic Chemistry Benzaldehyde chemistry.chemical_compound Yield (chemistry) Knoevenagel condensation Chemical stability |
Zdroj: | Dalton Transactions. 48:17371-17380 |
ISSN: | 1477-9234 1477-9226 |
Popis: | In the present work, a new MOF material of the UiO-family called Zr-UiO-66-NH-CH2-Py (1) has been obtained by the solvothermal technique and successfully characterized. The MOF structure was assembled with 2-((pyridin-4-ylmethyl) amino) terephthalic acid (H2BDC-NH-CH2-Py) as linker and Zr4+ ion. The activated form of 1 (called 1') exhibits considerable thermal and chemical stability. Compound 1' showed a very rapid and selective response for the fluorometric sensing of superoxide (O2·-) in aqueous medium even in the presence of the potentially competitive reactive oxygen species (ROS). The limit of detection value for O2·- sensing is 0.21 μM, which is comparable with those of the reported O2·- sensors. This is the first MOF based fluorescent sensor for the detection of O2·-. The response time of this MOF sensor for O2·- is very short (240 s). On the other hand, 1' was employed as a solid heterogeneous catalyst for Knoevenagel condensation between benzaldehyde and ethyl cyanoacetate at 80 °C in ethanol resulting in a very high yield of the desired product. The effects of the esterified linker ((CH3)2BDC-NH-CH2-Py) and the corresponding metal salt (ZrCl4) on this catalytic reaction were examined separately. We have also tested the substrate scope elaborately for the catalytic reaction promoted by catalyst 1'. |
Databáze: | OpenAIRE |
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