C-N bond formation is regarded as a very useful and fundamental reaction for the synthesis of nitrogen-containing molecules in both organic and pharmaceutical chemistry. Noble-metal and homogeneous catalysts have frequently been used for C-N bond formation, however, these catalysts have a number of disadvantages, such as high cost, toxicity, and low atom economy. In this work, a low-toxic and cheap iron complex (iron ethylene-1,2-diamine) has been loaded onto carbon nanotubes (CNTs) to prepare a heterogeneous single-atom catalyst (SAC) named Fe-N /CNTs. We employed this SAC in the synthesis of C-N bonds for the first time. It was found that Fe-N /CNTs is an efficient catalyst for the synthesis of C-N bonds starting from aromatic amines and ketones. Its catalytic performance was excellent, giving yields of up to 96 %, six-fold higher than the yields obtained with noble-metal catalysts, such as AuCl /CNTs and RhCl /CNTs. The catalyst showed efficacy in the reactions of thirteen aromatic amine substrates, without the need for additives, and seventeen enaminones were obtained. High-angle annular dark-field scanning transmission electron microscopy in combination with X-ray absorption spectroscopy revealed that the iron species were well dispersed in the Fe-N /CNTs catalyst as single atoms and that Fe-N might be the catalytic active species. This Fe-N /CNTs catalyst has potential industrial applications as it could be cycled seven times without any significant loss of activity.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1002/chem.201905468 | DOI Listing |
Chemphyschem
January 2025
CSIR-Central Electrochemical Research Institute Madras Unit, CSIR Madras Complex, Taramani, Tamil Nadu, Chennai, 600113, India.
The major challenges in enhancing the cycle life of lithium-sulfur (Li-S) batteries are polysulfide (PS) shuttling and sluggish reaction kinetics (S to LiS, LiS to S). To alleviate the above issues, the use of heteroatom-doped carbon as a cathode host matrix is a low-cost and efficient approach, as it works as a dual-functional framework for PS anchoring as well as an electrocatalyst for faster redox kinetics. Here, the dual role of heteroatom-doped carbon sheets (CS) in the chemisorption of LiS and catalysis of its faster conversion to LiS is established.
View Article and Find Full Text PDFChemSusChem
January 2025
National Institute for Nanotechnology (NINT), National Research Council of Canada Ed monton, Alberta, T6G 2 M9, Canada.
The sluggish transition and shuttle of polysulfides (LiPS) significantly hinder the application and commercialization of Li-S batteries. Herein, carbon nanotubes (CNTs) supported 10 nm sized iron Hexadecafluorophthalocyanine (FePcF/CNTs) are prepared using a solid synthesis approach. The well-exposed FePcF molecular improve the LiPS capture efficiency and redox kinetics by its central Fe-N units and F functional groups.
View Article and Find Full Text PDFJ Phys Chem Lett
August 2024
School of Chemistry, Engineering Research Center of Energy Storage Materials and Devices of Ministry of Education, National Innovation Platform (Center) for Industry-Education Integration of Energy Storage Technology, Xi'an Jiaotong University, Xi'an 710049, China.
The advancement of metal-air batteries is critically contingent on the progression of efficient catalysts for the oxygen reduction reaction (ORR). The potential applications of a series of FeN-doped carbon nanotubes (Fe-NCNTs) of varying diameters as ORR catalysts were examined using density functional theory. We explored the stability and electronic properties of Fe-NCNTs by analyzing the energy and examining the density of states.
View Article and Find Full Text PDFJ Hazard Mater
September 2024
School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, PR China; School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, PR China. Electronic address:
Peroxidase-like (POD-like) as a kind of new Fenton-like catalyst can effectively activate HO to degrade organic pollutants in water, but improving the catalytic activity and stability of POD-like remains a challenging task. Here, we synthesized a novel dual single-atom nanoenzyme (DSAzyme) FeMn/N-CNTs with Fe-N and Mn-N bimetallic single-atom active centers by mimicking the active centers of natural enzymes and taking advantage of the synergistic effect between the dual metals. FeMn/N-CNTs DSAzyme showed significantly enhanced POD-like activity compared to monometallic-loaded Fe/N-CNTs and Mn/N-CNTs.
View Article and Find Full Text PDFFood Chem
October 2024
College of Agricultural Engineering and Food Science, Shandong University of Technology, No. 266 Xincun Xilu, Zibo, Shandong 255049, China; Shandong Provincial Engineering Research Center of Vegetable Safety and Quality Traceability, No. 266 Xincun Xilu, Zibo, Shandong 255049, China; Zibo City Key Laboratory of Agricultural Product Safety Traceability, No. 266 Xincun Xilu, Zibo, Shandong 255049, China. Electronic address:
To effectively monitor multi-residues of penicillin antibiotics (PENs) in milk, we developed a novel ratiometric electrochemical aptasensor enabling simultaneous detection of PENs. The aptasensor employed a broad-spectrum aptamer as a recognition element, niobium carbide functionalized with methylene blue (NbC-MB) as a reference signal generator, and a ferrocene-labeled aptamer (Fc-Apt) as an output signal. Electrodes were modified with Fe-N-C doped carbon nanotubes (Fe-N-C-CNTs) to amplify detection signals further.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!