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排序方式: 共有662条查询结果,搜索用时 31 毫秒
661.
Kyoung Chul Park Prof. Dr. Preecha Kittikhunnatham Dr. Jaewoong Lim Grace C. Thaggard Yuan Liu Dr. Corey R. Martin Dr. Gabrielle A. Leith Donald J. Toler Dr. An T. Ta Dr. Nancy Birkner Dr. Ingrid Lehman-Andino Dr. Alejandra Hernandez-Jimenez Dr. Gregory Morrison Dr. Jake W. Amoroso Prof. Dr. Hans-Conrad zur Loye Dr. Dave P. DiPrete Dr. Mark D. Smith Prof. Dr. Kyle S. Brinkman Prof. Dr. Simon R. Phillpot Prof. Dr. Natalia B. Shustova 《Angewandte Chemie (International ed. in English)》2023,62(5):e202216349
A novel series of heterometallic f-block-frameworks including the first examples of transuranic heterometallic 238U/239Pu-metal–organic frameworks (MOFs) and a novel monometallic 239Pu-analog are reported. In combination with theoretical calculations, we probed the kinetics and thermodynamics of heterometallic actinide(An)-MOF formation and reported the first value of a U-to-Th transmetallation rate. We concluded that formation of uranyl species could be a driving force for solid-state metathesis. Density of states near the Fermi edge, enthalpy of formation, band gap, proton affinity, and thermal/chemical stability were probed as a function of metal ratios. Furthermore, we achieved 97 % of the theoretical maximum capacity for An-integration. These studies shed light on fundamental aspects of actinide chemistry and also foreshadow avenues for the development of emerging classes of An-containing materials, including radioisotope thermoelectric generators or metalloradiopharmaceuticals. 相似文献
662.
Hans R. Kricheldorf Ingrid Kreiser‐Saunders Dirk‐Olaf Damrau 《Macromolecular Symposia》2000,159(1):247-258
Numerous nontoxic (resorbable) salts were prepared from cations and anions belonging to the human metabolism, such as Na, K, Mg, Ca, Zn and Fe in combination with chloride, iodide, hydroxide, carbonate, acetate, stearate, glycolate, L‐lactate, D‐mandelate and various N‐substituted α‐amino acids. All these salts were used as initiators for polymerizations of L‐lactide in bulk at 100–180°C. Furthermore, Grignard reagents, hemin and hematin were included in this study. Zn L‐lactate was found to be the most useful initiator in terms of reactivity, maximum molecular weight of the isolated poly(L‐lactide) and its optical purity. Zn L‐lactate initiated copolymerizations of L‐lactide and glycolid or L‐lactide and ϵ‐caprolactone were also studied. Finally, first studies of the polymerization mechanism of zinc stearate and zin 2‐ethylhexanoate were performed. They suggest that zinc carboxylates combined with an alcohol as coinitiator form reactive zinc alkoxides which are the true initiators at temperatures < 150°C. 相似文献