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31.
by MnO2-oxidation of 3-pyridazinemethanol is reported. Properties of2 and its reactions with NH-compounds and methyl-pyridazines (3, 5) are studied. Reaction of2 with3 yields mainly products of aldol addition (10, 12). In contrast to pyridazinyl-4-carbinols elimination of H2O from10 leads to the alkene11. Isolation of the di-pyridazinyl-ethane6 as main product of reaction of2 with5 however shows, that thermally induced dismutation cannot be excluded also on pyridazinyl-3-carbinols.
Herrn Prof. Dr.F. Vieböck mit den besten Wünschen zum 75. Geburtstag gewidmet. 相似文献
Herrn Prof. Dr.F. Vieböck mit den besten Wünschen zum 75. Geburtstag gewidmet. 相似文献
32.
Heller DA Mayrhofer RM Baik S Grinkova YV Usrey ML Strano MS 《Journal of the American Chemical Society》2004,126(44):14567-14573
Gel electrophoresis and column chromatography conducted on individually dispersed, ultrasonicated single-walled carbon nanotubes yield simultaneous separation by tube length and diameter. Electroelution after electrophoresis is shown to produce highly resolved fractions of nanotubes with average lengths between 92 and 435 nm. Separation by diameter is concomitant with length fractionation, and nanotubes that have been cut shortest also possess the greatest relative enrichments of large-diameter species. Longer sonication time causes increased electrophoretic mobility in the gels; thus, ultrasonic processing determines the degree of both length and diameter separation of the nanotubes. The relative quantum yield decreases nonlinearly as the nanotube length becomes shorter. These techniques constitute a preparative, scalable method for separating nanotubes by two important attributes required for electronic and sensor applications. 相似文献
33.
A. Mayrhofer J. L. Sheldon und P. Cohen-Henriauez 《Fresenius' Journal of Analytical Chemistry》1936,107(3-4):128-129
Ohne Zusammenfassung 相似文献
34.
M. Sanderova K. Sandera V. Stehlik K. Gandera L. Sattler J. E. Mull I. Lorge I. Sorgato F. Pridal A. Conlin C. Smolenski T. Pietrzykowski V. Dejmek F. Stern F. Kryz R. Ofner W. R. Fetzer J. W. Evans W. Z. Hassid M. Nurmia F. W. Zerban W. J. Hughes M. H. Wiley J. N. Taran Mary Scott E. S. West E. Roboz G. Vavrinecz M. Nordlund D. A. Magraw C. W. Sievert F. Massa M. Kminek S. Sanya H. Riehm H. C. S. de Whalley Ö. Fernández M. de Mingo G. Oschmjan M. Kudrjawzewa W. B. Sinclair E. T. Bartholomew K. P. Jácobsohn J. Mayrhofer E. Jekel A. Josz S. Molirískij 《Analytical and bioanalytical chemistry》1937,108(11-12):445-455
35.
K. B. Lehmann Mayrhofer und A. Tschirch 《Fresenius' Journal of Analytical Chemistry》1893,32(1):519-520
Ohne Zusammenfassung 相似文献
36.
The potential range of the transition region between the diffusion-limited reduction to oxidation of hydrogen peroxide depends strongly on the nature of the cation of the supporting alkaline electrolyte. Non-covalent interactions between the hydrated alkali metal cations and chemisorbed OH species on platinum influence the potential-dependent reaction kinetics. 相似文献
37.
Dr. Ioannis Katsounaros Dr. Serhiy Cherevko Dr. Aleksandar R. Zeradjanin Dr. Karl J. J. Mayrhofer 《Angewandte Chemie (International ed. in English)》2014,53(1):102-121
Electrochemistry will play a vital role in creating sustainable energy solutions in the future, particularly for the conversion and storage of electrical into chemical energy in electrolysis cells, and the reverse conversion and utilization of the stored energy in galvanic cells. The common challenge in both processes is the development of—preferably abundant—nanostructured materials that can catalyze the electrochemical reactions of interest with a high rate over a sufficiently long period of time. An overall understanding of the related processes and mechanisms occurring under the operation conditions is a necessity for the rational design of materials that meet these requirements. A promising strategy to develop such an understanding is the investigation of the impact of material properties on reaction activity/selectivity and on catalyst stability under the conditions of operation, as well as the application of complementary in situ techniques for the investigation of catalyst structure and composition. 相似文献
38.
Olga Kasian Simon Geiger Karl J.J. Mayrhofer Serhiy Cherevko 《Chemical record (New York, N.Y.)》2019,19(10):2130-2142
Electrocatalyst degradation due to dissolution is one of the major challenges in electrochemical energy conversion technologies such as fuel cells and electrolysers. While tendencies towards dissolution can be grasped considering available thermodynamic data, the kinetics of material's stability in real conditions is still difficult to predict and have to be measured experimentally, ideally in‐situ and/or on‐line. On‐line inductively coupled plasma mass spectrometry (ICP‐MS) is a technique developed recently to address exactly this issue. It allows time‐ and potential‐resolved analysis of dissolution products in the electrolyte during the reaction under dynamic conditions. In this work, applications of on‐line ICP‐MS techniques in studies embracing dissolution of catalysts for oxygen reduction (ORR) and evolution (OER) as well as hydrogen oxidation (HOR) and evolution (HER) reactions are reviewed. 相似文献
39.
40.
Karl J.J. Mayrhofer Josef C. Meier Sean J. Ashton Gustav K.H. Wiberg Florian Kraus Marianne Hanzlik Matthias Arenz 《Electrochemistry communications》2008,10(8):1144-1147
A newly developed methodology for examining fuel cell catalyst degradation is introduced. In contrast to the conventional, destructive TEM investigation procedure, this methodology enables the observation of corrosion processes of the same catalyst region repeatedly. In particular we demonstrate the impact of a potential cycling treatment on a carbon-supported platinum catalyst, and propose a new corrosion mechanism for fuel cell catalyst degradation. Under the applied harsh conditions, whole Pt particles detach from the support and dissolve into the electrolyte without re-deposition. 相似文献