Разработка и исследования ионного Br - диода

Объектом исследования является ионный Br–диод с внешним магнитным полем. Целью работы является разработка конструкции ионного Br–диода и проведение на нем исследовании по генерации мощных ионных пучков различного массового состава и фокусировки ионного пучка, для повышения эффективности работы ионного диода и ресурса работы анодного покрытия. В процессе исследования проводились расчеты по определению размеров и конструкции ионного Br-диода, параметров магнитного поля, создаваемого внешним источником питания. По разработанному Br-ионному диоду проводились экспериментальные исследования различных эмиссионных покрытий анода, а также опыты по улучшению фокусировки ионного пучка.The object of investigation is an ion Br-diode with an external magnetic field. The aim of the work is to develop the design of the ion Br-diode and to carry out research on the generation of powerful ion beams of various mass composition and focusing of the ion beam, in order to increase the efficiency of the ion diode and the life of the anode coating. During the research, calculations were made to determine the size and design of the ion Br-diode, the parameters of the magnetic field created by an external power source. Based on the developed Br-ion diode, experimental studies of various emission coatings of the anode, as well as experiments to improve the focusing of the ion beam, were carried out

Synthese, Charakterisierung und Untersuchungen zum Reaktionsverhalten von Boraziden und Borylnitrenen

Wir konnten zeigen, dass bestimmte photochemisch erzeugte Borylnitrene $R_{2}BN$ eine hohe Tendenz zeigen in die starken C-H-Bindungen von Alkanen R´H - inklusive Methan - zu insertieren. Die gebildeten Aminoborane des Typs $R_{2}BNHR`$ lassen sich dann im Anschluss bequem unter Spaltung der BN-Einheit in nützliche organische Verbindungen wie Amine und Amide abbauen

C–H Bond Amination by Photochemically Generated Transient Borylnitrenes at Room Temperature: A Combined Experimental and Theoretical Investigation of the Insertion Mechanism and Influence of Substituents

A number of azidoboranes having substitution patterns that are derived from catechol (<b>3</b>), pinacol (<b>4a</b>), 1,2-diaminoethane (<b>4b</b>,<b>c</b>), 1,2-ethanedithiol (<b>4d</b>), and 1,2,4,5-tetrahydroxybenzene as well as acyclic dialkoxy species (<b>5</b><b></b>) were synthesized and, in the case of <b>4c</b> (<i>N</i>,<i>N</i>′-ditosyl-2-azido-1,3,2-diazaborolane), also structurally characterized. The azidoboranes were photolyzed in cyclohexane solvent in order to investigate the tendency of the generated borylnitrenes to undergo intermolecular C–H insertion reactions. The yields of intermolecular insertion products ranged from very good (<b>4a</b>) to vanishingly small, depending on the substitution of the azidoborane. For a number of borylnitrenes the zero-field splitting parameter <i>D</i> was measured in organic glasses at 4 K. The small primary kinetic isotope effect (<i>k</i>_H/<i>k</i>_D = 1.35) measured for <b>4a</b> in mixtures of [H₁₂]­cyclohexane and [D₁₂]­cyclohexane suggests that the insertion reaction is concerted and involves the singlet state of the borylnitrene. Computations at the CBS-QB3 and CCSD­(T)/TZ2P levels of theory show that the relative energies of singlet and triplet states of a wide variety of borylnitrenes and even their nature as minima or saddle points depend strongly on the substituents. Photolysis of the most reactive azidoborane, <b>4a</b>, in methane in a flow reactor at atmospheric pressure produces an intermolecular insertion product in low yields, in agreement with the expectation of intersystem crossing to the less reactive triplet state of the borylnitrene