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排序方式: 共有999条查询结果,搜索用时 15 毫秒
991.
Susanne Brinkmann‐Rengel Heinz‐Friedrich Sutoris Horst Weiß 《Macromolecular Symposia》2001,163(1):145-156
Recent development in controlled radical polymerization has provided a tool to combine a relatively robust radical polymerization technique with structural control. This contribution focuses on stable free radical polymerization in the presence of nitroxides. The influence of 2,2,6,6‐tetramethyl‐piperidine‐N‐oxyl (TEMPO) and temperature on the copolymerization of styrene and acrylonitrile will be discussed. In the second part a new class of nitroxide stable free radicals will be presented that shows enhanced performance in styrene polymerizations. 相似文献
992.
993.
Mads Sondrup Møller Dr. Victor Petrunin Prof. Susanne Mossin Prof. Vickie McKee Prof. Christine J. McKenzie 《欧洲无机化学杂志》2023,26(27):e202300235
Reactions of chemisorbed reagents inside the crystalline molecular solid state are rare but offer unexploited methods for selective solvent-free chemical synthesis. Here we show that the greenhouse gas precursor, nitric oxide (NO) is chemisorbed by crystals of the hexafluorophosphate salts of complexes containing dicobalt sites. On NO sorption a cascade of reactions results in the in-crystal synthesis of nitrite and other gaseous NOx. Recrystallization enabled structural elucidation of the mixed valent {[(bpbp)Co2(μ-(η1-O : η1-N)-ONO)]2(bdc)}4+ (bpbp=2,6-bis(N,N-bis(2-pyridylmethyl)aminomethyl)-4-tert-butylphenolato, bdc=1,4-benzenedicarboxylato) cation. Overlapping signals in the solid-state EPR spectra confirm the CoIICoIII oxidation state and the presence of NO2 trapped inside the unrecrystallised solid products (br. g=4, triplet g=2 (340 mT), A(N)=73 MHz), despite three cycles of vacuum and N2 flushing. Consistently, νN−O bands appear in the Raman and IR spectra that are due to the coordinated nitrate and the trapped NO2 that were synthesized in-crystal. The latter is expelled by heating the solid to 160 °C or by recrystallization. Dimetallic cooperativity is proposed for the NO transformations in these rare examples of selective, chemisorptive substrate reactions in the solid-state. 相似文献
994.
995.
996.
Susanne Stich Delphine Bard Leo Gros H. Walter Wenz Jack Yarwood Ken Williams 《Journal of Raman spectroscopy : JRS》1998,29(9):787-790
Raman microscopy was used to identify unambiguously the anions of lead and barium in gunshot residues (ca. 5 μm in size) deposited on cellulosic substrates. It was found that most of the particles consist of mixtures of oxides, sulphate and carbonate (along with carbon). In particular, there is strong evidence for the formation of mixed oxides of iron but only relatively little evidence for oxides of antimony. The Raman technique has been shown to be able to identify individual or mixed components and to confirm the presence of microcrystalline particles with a particular crystal structure (e.g. orthorhombic lead oxide). © 1998 John Wiley & Sons, Ltd. 相似文献
997.
998.
Stefan Albus Friederike Hammar Susanne Donner Michael Groß 《Nachrichten aus der Chemie》2001,49(2):122-127
999.
Susanne Baersch Ilona Kretzschmar Detlef Schroeder Helmut Schwarz P. B. Armentrout 《ChemInform》1999,30(46):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