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861.
Lorenzo Albertazzi Mike Heilemann 《Angewandte Chemie (International ed. in English)》2023,62(35):e202303390
The exploitation of low-affinity molecular interactions in protein labeling is an emerging topic in optical microscopy. Such non-covalent and low-affinity interactions can be realized with various concepts from chemistry and for different molecule classes, and lead to a constant renewal of fluorescence signals at target sites. Further benefits are a versatile use across microscopy methods, in 3D, live and many-target applications. In recent years, several classes of low-affinity labels were developed and a variety of powerful applications demonstrated. Still, this research field is underdeveloped, while the potential is huge. 相似文献
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863.
Dr. Mowpriya Das Dr. Conor Hogan Robert Zielinski Milan Kubicki Dr. Maximilian Koy Canan Kosbab Simone Brozzesi Ankita Das Mike Thomas Nehring Viktoria Balfanz Juls Brühne Prof. Dr. Mario Dähne Dr. Martin Franz Prof. Dr. Norbert Esser Prof. Dr. Frank Glorius 《Angewandte Chemie (International ed. in English)》2023,62(50):e202314663
The adsorption of N-heterocyclic olefins (NHOs) on silicon is investigated in a combined scanning tunneling microscopy, X-ray photoelectron spectroscopy, and density functional theory study. We find that both of the studied NHOs bind covalently, with ylidic character, to the silicon adatoms of the substrate and exhibit good thermal stability. The adsorption geometry strongly depends on the N-substituents: for large N-substituents, an upright adsorption geometry is favored, while a flat-lying geometry is found for the NHO with smaller wingtips. These different geometries strongly influence the quality and properties of the obtained monolayers. The upright geometry leads to the formation of ordered monolayers, whereas the flat-lying NHOs yield a mostly disordered, but denser, monolayer. The obtained monolayers both show large work function reductions, as the higher density of the flat-lying monolayer is found to compensate for the smaller vertical dipole moments. Our findings offer new prospects in the design of tailor-made ligand structures in organic electronics and optoelectronics, catalysis, and material science. 相似文献
864.
Dr. Marat Meleshin Lukas Koch Dr. Christoph Wiedemann Prof. Dr. Mike Schutkowski 《Angewandte Chemie (International ed. in English)》2023,62(25):e202301543
Herein we report a mild, efficient, and epimerization-free method for the synthesis of peptide-derived 2-thiazolines and 5,6-dihydro-4H-1,3-thiazines based on a cyclodesulfhydration of N-thioacyl-2-mercaptoethylamine or N-thioacyl-3-mercaptopropylamine derivatives. The described reaction can be easily carried out in aqueous solutions at room temperature and it is triggered by change of the pH, leading to complex thiazoline or dihydrothiazine derivatives without epimerization in excellent to quantitative yields. The new method was applied in the total synthesis of the marine metabolite mollamide F, resulting in the revision of its stereochemistry. 相似文献
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