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Tobias Kaper Dr. Malte Fischer Hermann Thye Dennis Geik Dr. Marc Schmidtmann Prof. Dr. Ruediger Beckhaus Prof. Dr. Sven Doye 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(23):6899-6903
Intermolecular hydroaminoalkylation reactions of alkynes with secondary amines, which selectively give access to allylic amines with E configuration of the alkene unit, are achieved in the presence of titanium catalysts. Successful reactions of symmetrically substituted diaryl- and dialkylalkynes as well as a terminal alkyne take place with N-benzylanilines, N-alkylanilines, and N-alkylbenzylamines. 相似文献
166.
We demonstrate a direct correlation between the charge state and photoluminescence (PL) intensity of individual CdSe nanowires by actively charging them and performing electrostatic force microscopy and PL measurements simultaneously. While the injection of positive charges leads to an immediate PL quenching, a small amount of injected electrons can lead to an increase of the PL intensity. We directly observed the migration of excess charges into the substrate, which leads to a recovery of the PL. Further, we show that the PL of individual NWs can be actively switched between on and off states by charging with the atomic-force microscope tip. We propose a model based on charge trapping and migration into the substrate to explain our results. 相似文献
167.
Scalable multichannel microstructuring was demonstrated by multiplexing a focused molecular fluorine laser beam with cylindrical nanolayer microaxicons into an array of converging pseudo-nondiffracting subbeams. The axicons were fabricated by shadow-mask vapor deposition of magnesium fluoride onto substrates of identical material. Long-period surface gratings of variable pitch were generated on poly(methyl methacrylate) by varying the target position within the converging periodic focal lines. 相似文献
168.
Alexander Yu. Makarov Ruediger Mews Andrey V. Zibarev 《Journal of fluorine chemistry》2006,127(3):437-442
Mismatched molecular 1:1 complexes of C10F8 with catenated chalcogen-nitrogen compounds C6H5-X-NSN-SiMe3 (X = S, Se) were prepared and characterized by X-ray crystallography. The complexes provide examples of structurally non-rigid polyheteroatom molecules involved in non-covalent arene-polyfluoroarene π-stacking interactions. In going from homocrystals to the co-crystals, the molecular Z, E configuration of the catenated compounds changes from noticeably non-planar to perfectly planar, i.e. C10F8 acts as “molecular iron”. On the other hand, C10H8 does not produce complexes with C6F5-X-NSN-SiMe3 (X = S, Se). 相似文献
169.
In this paper, a linear controller based on the Lyapunov stability theorem is designed and implemented on a smart beam. This smart beam consists of a steel beam with a piezoactuator bonded to it. The controller is used to attentuate the vibrations of the smart beam while exciting it by it's first eigenmode. A super element (SE) model of the same beam is firstly derived, and the controller is implemented on the SE and results are shown. (© 2012 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
170.
Hauke Paulsen Ventzislav Rusanov Ruediger Benda Christian Herta Volker Schuenemann Christoph Janiak Thomas Dorn Aleksandr I. Chumakov Heiner Winkler Alfred X. Trautwein 《ChemInform》2002,33(26):no-no
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option. 相似文献