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Precise Electron-Withdrawing Strength Regulation of π-Conjugate Bridge-Boosted Specific Detection toward α-Methyltryptamine.
Anal Chem
January 2025
Xinjiang Key Laboratory of Trace Chemical Substances Sensing, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 830000, China.
The specific fluorescent detection of α-methyltryptamine (AMT) presents a great challenge because similar amine groups and benzene rings exist in a variety of amines. Here, we show the precise modulation of the electron-withdrawing strength of the π-conjugate bridge in aldehyde-containing Schiff base-based fluorescent probes for ultratrace AMT discrimination. It is found that different electron-withdrawing groups -CH, -CHN, and -CHBr as the π-conjugate bridge of the 2-dicyanomethylidene-3-cyano-4,5,5-trimethyl-2,5-dihydrofuran (TCF)-based probes can classify and identify organic amines with different amine nucleophilicities.
View Article and Find Full Text PDFDirect conversion of methane to aromatics and hydrogen via a heterogeneous trimetallic synergistic catalyst.
Nat Commun
April 2024
Energy and Environment Science & Technology, Idaho National Laboratory, Idaho Falls, ID, 83415, USA.
Non-oxidative methane dehydro-aromatization reaction can co-produce hydrogen and benzene effectively on a molybdenum-zeolite based thermochemical catalyst, which is a very promising approach for natural-gas upgrading. However, the low methane conversion and aromatics selectivity and weak durability restrain the realistic application for industry. Here, a mechanism for enhancing catalysis activity on methane activation and carbon-carbon bond coupling has been found to promote conversion and selectivity simultaneously by adding platinum-bismuth alloy cluster to form a trimetallic catalyst on zeolite (Pt-Bi/Mo/ZSM-5).
View Article and Find Full Text PDFThe aroma characteristics of seven commercial Chinese sunflower seed oils were investigated in this study using descriptive analysis, headspace solid-phase microextraction coupled with GC-quadrupole-MS (LRMS, low-resolution mass spectrometry), and GC-Orbitrap-MS (HRMS, high-resolution mass spectrometry). GC-Orbitrap-MS quantified 96 compounds, including 18 alcohols, 12 esters, 7 ketones, 20 terpenoids, 11 pyrazines, 6 aldehydes, 6 furans, 6 benzene ring-containing compounds, 3 sulfides, 2 alkanes, and 5 nitrogen-containing compounds. Moreover, 22 compounds including 5 acids, 1 amide, and 16 aldehydes were quantified using GC-Quadrupole-MS.
View Article and Find Full Text PDFKinetic trapping of 2,4,6-tris(4-pyridyl)benzene and ZnI into ML poly-[n]-catenanes using solution and solid-state processes.
Sci Rep
April 2023
Dipartimento di Chimica Materiali e Ingegneria Chimica, ''Giulio Natta'', Politecnico di Milano, Via L. Mancinelli 7, 20131, Milan, Italy.
Here, we show that in a supramolecular system with more than 20 building blocks forming large icosahedral ML metal-organic cages (MOCs), using the instant synthesis method, it is possible to kinetically trap and control the formation of interlocking ML nanocages, giving rare ML TPB-ZnI poly-[n]-catenane. The catenanes are obtained in a one-pot reaction, selectively as amorphous (a1) or crystalline states, as demonstrated by powder X-ray diffraction (powder XRD), thermogravimetric (TG) analysis and H NMR. The 300 K ML poly-[n]-catenane single crystal X-ray diffraction (SC-XRD) structure including nitrobenzene (1) indicates strong guest binding with the large ML cage (i.
View Article and Find Full Text PDFExperimental X-ray and DFT Structural Analyses of ML Poly-[]-catenanes Using exo-Tridentate Ligands.
Inorg Chem
July 2022
Dipartimento di Chimica Materiali e Ingegneria Chimica "Giulio Natta", Politecnico di Milano, Via Luigi Mancinelli 7, Milan 20131, Italy.
Despite their potential applications in host-guest chemistry, there are only five reported structures of poly-[]-catenanes self-assembled by elusive icosahedral nanocages. This small number of structures of poly-[]-catenanes is because self-assembly of large metal-organic cages (MOCs) with large windows allowing catenation by means of is very challenging. Structural reports of poly-[]-catenanes are needed to increase our knowledge about the self-assembly and genesis of such materials.
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