Severity: Warning
Message: fopen(/var/lib/php/sessions/ci_sessionlbq8nf3uh7gm0odnepvg60tfadpsme60): Failed to open stream: No space left on device
Filename: drivers/Session_files_driver.php
Line Number: 177
Backtrace:
File: /var/www/html/index.php
Line: 316
Function: require_once
Severity: Warning
Message: session_start(): Failed to read session data: user (path: /var/lib/php/sessions)
Filename: Session/Session.php
Line Number: 137
Backtrace:
File: /var/www/html/index.php
Line: 316
Function: require_once
Interest in homogeneous gold catalysis has undergone a marked increase. As strong yet air- and moisture-tolerant π-acids, cationic gold(i) complexes have been shown to catalyze diverse transformations of alkenes, alkynes and allenes, opening new opportunities for chemical synthesis. The development of efficient asymmetric variants is required in order to take full advantage of the preparative potential of these transformations. During the last few years, the chemical community has achieved tremendous success in the area. This review highlights the updated progress (2011-2015) in enantioselective gold catalysis. The discussion is classified according to the π-bonds activated by gold(i), in an order of alkynes, allenes and alkenes. Other gold activation modes, such as σ-Lewis acid catalyzed reactions and transformations of diazo compounds are also discussed.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1039/c5cs00929d | DOI Listing |
Int J Biol Macromol
March 2025
College of Chemistry and Chemical Engineering, Henan Key Laboratory of Rare Earth Functional Materials, Zhoukou Normal University,Zhoukou, 466001, China.
A novel nanosensing system was constructed for highly sensitive and selective detection of cysteine (Cys) via the combination of the excellent optical properties of bovine serum albumin-stabilized gold nanoflowers (BSA-AuNFs), the high selectivity of the molecular structure regulation performance of cystine, and the high sensitivity of the multi-cascade signal amplification strategy. The sensing mechanism has been confirmed by UV-vis absorption spectroscopy, TEM, HRMS and H NMR spectra titration analysis, which can effectively improve the sensitivity and selectivity of the detection of Cys. In addition, the molecular structure regulation performance of cystine (disulfide bond effect) further improved the selectivity of this analytical system.
View Article and Find Full Text PDFNat Commun
March 2025
Department of Chemistry and Nanoscience, Ewha Womans University, Seoul, Republic of Korea.
Cascade enzymatic reactions in living organisms are fundamental reaction mechanisms in coordinating various complex biochemical processes such as metabolism, signal transduction, and gene regulation. Many studies have attempted to mimic cascade reactions using nanoparticles with enzyme-like activity; however, precisely tuning each reaction within complex networks to enhance the catalytic activity remains challenging. Here, we present enzyme-like chiral plasmonic nanoparticles for optically tunable catalytic cancer therapy.
View Article and Find Full Text PDFBiochim Biophys Acta Gen Subj
March 2025
Department of Basic Science, School of Medicine, Loma Linda University, 11175 Campus Street, Loma Linda, CA 92350, USA. Electronic address:
X-irradiation has extensive applications in therapy and considerable attention has been devoted to the radiosensitizing properties of nanoparticles composed of high atomic number elements, particularly gold. Low energy electrons and/or heterogenous catalysis are widely suspected to be involved in radiosensitization, but there is uncertainty about their contributions. Because of their greater surface area to volume ratio relative to spherical particles per unit mass of gold, nanostars permit more low energy electrons to escape and posses an increased catalytic activity.
View Article and Find Full Text PDFPhys Chem Chem Phys
March 2025
Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China.
Single-atom catalysts revolutionize catalysis by maximizing atomic efficiency and enhancing reaction specificity, offering high activity and selectivity with minimal material usage, which is crucial for sustainable processes. However, the unique properties that distinguish single-atom catalysts from other forms, including bulk and nanoparticle catalysts, as well as the physical mechanisms behind their high activity and selectivity, remain unclear, limiting their broader application. Here, through first-principles calculations, we have identified an environmentally adaptive gold single-atom catalyst on a CeO(111) surface capable of adjusting its valence state in response to different environmental conditions.
View Article and Find Full Text PDFACS Nano
March 2025
Department of Chemistry, Tsinghua University, Beijing 10084, P. R. China.
Hydrogenation reactions represent some of the most extensively studied topics within the field of catalysis. A novel alkynyl and phosphine coprotected [Au(PhC≡C)(PhP)](SOCF)() nanocluster has been synthesized, and its structure was determined by single crystal X-ray diffraction (SCXRD). Density functional theory calculation shows that features an 18-electron superatomic molecule character with a configuration of (1σ)(1n)(1π)(2σ)(1σ*)(3σ)(2n)(3n)(1π*), which is significantly different from previously reported 18-electron metal nanoclusters.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!