Tato práce je studií a experimentální demonstrací systému určení polohy na základě zpracování oportunních signálů Dopplerovskou metodou. Tato metoda určení polohy využívá příjmu signálů vyslaných za jiným účelem než navigace a měření jejich Dopplerovské frekvence. Dopplerovská metoda je popsána a některé satelitní systémy na nízké orbitě Země poten...
Enantioselective hydrogenation of acrylic acid derivatives provides a straightforward access to optically active molecules of biological interest such as Naproxen or Ibuprofen as lead molecules. Initially performed with rhodium and ruthenium catalysts, this reaction has successively seen the appearance of efficient iridium catalysts and more recent...
The mechanisms of the Cp*IrIII(bpyOO)‐catalyzed (bpyOO = bidentate (NN) doubly deprotonated 2,2'‐bipyridine‐6,6'‐diol) acceptorless methanol dehydrogenation and acetophenone transfer hydrogenation by methanol under basic conditions have been explored by the combination of 1H NMR, kinetics, and DFT computational studies. During dehydrogenation of me...
Recently, Professor David MacMillan introduced an original light-mediated catalytic process where simple aldehyde substrates undergo coupling with a variety of olefin partners to enantioselectively afford α-alkyl carbonyl adducts. Based on the redox potential values reported for some transient intermediates and on the knowledge-based reactivity of ...
Published in Chemical record (New York, N.Y.)
Proton exchange membrane water splitting (PEMWS) technology has high-level current density, high operating pressure, small electrolyzer-size, integrity, flexibility, and has good adaptability to the volatility of wind power and photovoltaics, but the development of both active and high stability of the anode electrocatalyst in acidic environment is...
Published in Biomaterials
Melanoma represents the most fatal form of skin cancer due to its resistance mechanisms and high capacity for the development of metastases. Among other medicinal techniques, photodynamic therapy is receiving increasing attention. Despite promising results, the application of photodynamic therapy is inherently limited due to interference from melan...
Published in Angewandte Chemie (International ed. in English)
Phosphorescent probes often show sensitive response toward analytes at a specific wavelength. However, oxygen quenching usually occurs at the same wavelength and thus hinders the accurate detection of analytes. In this study, we have developed dual-emissive iridium(III) complexes that exhibit phosphorescence responses to copper(II) ions at a wavele...
Published in Angewandte Chemie (International ed. in English)
Enantioselective synthesis of N-N biaryl atropisomers is an emerging area but remains underexplored. The development of efficient synthesis of N-N biaryl atropisomers is in great demand. Herein, the construction of N-N biaryl atropisomers through iridium-catalyzed asymmetric C-H alkylation is reported for the first time. In the presence of readily ...
Published in Angewandte Chemie (International ed. in English)
Despite the widespread success in the functionalization of C(sp2 )-H bonds, the deliberate functionalization of C(sp3 )-H bonds in a highly site- and stereoselective manner remains a longstanding challenge. Herein, we report an iridium/aluminum cooperative catalytic system that enables the β-selective C-H borylation of saturated cyclic amines and l...
Tato doktorská práce popisuje vývoj, výrobu a testování odrazivých vrstev pro rentgenové teleskopy. Popisované vrstvy jsou navrženy tak, aby obešly některá omezení, kterým čelí materiály používané v současnosti, například pokles odrazivosti v okolí absorpčních hran. Cílem je, aby mohly být použity při stavbě budoucích kosmických teleskopů. Vrstvy b...
