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71.
Igor Sharf Andrii Tykhonov Grygorii Sokhrannyi Maksym Deliyergiyev Natalia Podolyan Vitaliy Rusov 《Central European Journal of Physics》2012,10(4):858-887
We demonstrate a new method to calculate inelastic scattering cross-sections, which in contrary to the Regge-based methods takes into account the energy momentum conservation law. It is shown that the main contribution to integral expressing inelastic scattering cross-sections does not come from the multi-Regge domain. In particular, accounting for the longitudinal momenta contribution to virtualities is sufficient and results in the new mechanism of cross-section growth. The reasons for taking into account the sufficiently high number of interference contributions are shown and the approximate method for this purpose is developed. By fitting single free parameter of the model achieved a qualitative agreement of the total and inelastic cross sections with experimental data. 相似文献
72.
73.
Dr. Serhii Krykun Maksym Dekhtiarenko Dr. David Canevet Dr. Vincent Carré Prof. Frédéric Aubriet Dr. Eric Levillain Magali Allain Prof. Zoia Voitenko Prof. Marc Sallé Dr. Sébastien Goeb 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(2):726-730
Developing methodologies for on-demand control of the release of a molecular guest requires the rational design of stimuli-responsive hosts with functional cavities. While a substantial number of responsive metallacages have already been described, the case of coordination-tweezers has been less explored. Herein, we report the first example of a redox-triggered guest release from a metalla-assembled tweezer. This tweezer incorporates two redox-active panels constructed from the electron-rich 9-(1,3-dithiol-2-ylidene)fluorene unit that are facing each other. It dimerizes spontaneously in solution and the resulting interpenetrated supramolecular structure can dissociate in the presence of an electron-poor planar unit, forming a 1:1 host–guest complex. This complex dissociates upon tweezer oxidation/dimerization, offering an original redox-triggered molecular delivery pathway. 相似文献
74.
Simulations of reflection electron microscopy (REM) images of both monolayer and bilayer steps on the bulk-terminated Si(001) surface, for the case when the primary electron beam azimuth is directed parallel to the line of the step, are presented. The simulations employ our previously reported theory of REM image formation which uses a 2D Bloch wave formulation of dynamical (multiple scattering) elastic RHEED theory to calculate diffracted amplitudes propagating from the surface. The only step contrast mechanism considered here is phase contrast and this is sufficient to produce the characteristic “black-white” appearance observed experimentally. Defocusing of the simulated images is also discussed. 相似文献
75.
Sicard D Cecioni S Iazykov M Chevolot Y Matthews SE Praly JP Souteyrand E Imberty A Vidal S Phaner-Goutorbe M 《Chemical communications (Cambridge, England)》2011,47(33):9483-9485
Atomic force microscopy reveals that Pseudomonas aeruginosa LecA (PA-IL) and a tetra-galactosylated 1,3-alternate calix[4]arene-based glycocluster self-assemble according to an aggregative chelate binding mode to create monodimensional filaments. Lectin oligomers are identified along the filaments and defects in chelate binding generate branches and bifurcations. A molecular model with alternate 90° orientation of LecA tetramers is proposed to describe the organisation of lectins and glycoclusters in the filaments. 相似文献
76.
Yaroslav Studenyak Maksym Fershal Larysa Kushnir Alexander V. Gomonnai 《Electroanalysis》2012,24(7):1621-1629
Screening of active substances based on styryl and trimethine cyanine dyes was carried out to prepare tetrafluoroborate ion‐selective electrodes. Correlations between the nature of the organic cation (pKa) and working pH ranges of the sensors were studied. New tetrafluoroborate‐selective PVC membrane electrodes based on an active substance formed by the ion pair of 2‐(n‐ethylcarbazol‐3)‐ethenyl‐1,3,3‐trimethyl‐3H‐indolium and 2‐[3‐(5,6‐dimethyl‐3‐nonyl‐1,3‐benzothiazol‐2(3H)‐ylidene)propenyl]‐5,6‐dimethyl‐3‐nonyl‐1,3‐benzothiazolium with tetrafluoroborate ion were developed. The electrodes are non‐sensitive to pH in the range of 2–8 and can be used for boron determination in acidic media of 6–7 mol L?1 H2SO4. The developed sensor was successfully applied for the determination of B2O3 in CdS(Se) nanocrystal‐doped glasses. 相似文献
77.
Fry PW Itskevich IE Mowbray DJ Skolnick MS Finley JJ Barker JA O'Reilly EP Wilson LR Larkin IA Maksym PA Hopkinson M Al-Khafaji M David JP Cullis AG Hill G Clark JC 《Physical review letters》2000,84(4):733-736
New information on the electron-hole wave functions in InAs-GaAs self-assembled quantum dots is deduced from Stark effect spectroscopy. Most unexpectedly it is shown that the hole is localized towards the top of the dot, above the electron, an alignment that is inverted relative to the predictions of all recent calculations. We are able to obtain new information on the structure and composition of buried quantum dots from modeling of the data. We also demonstrate that the excited state transitions arise from lateral quantization and that tuning through the inhomogeneous distribution of dot energies can be achieved by variation of electric field. 相似文献
78.
Agnieszka Noculak Simon C. Boehme Marcel Aebli Yevhen Shynkarenko Kyle M. McCall Maksym V. Kovalenko 《Helvetica chimica acta》2021,104(2):e2000222
The expanding range of optoelectronic applications of lead-halide perovskites requires their production in diverse forms (single crystals, thin- and thick-films or even nanocrystals), motivating the development of diverse materials processing and deposition routes that are specifically suited for these structurally soft, low-melting semiconductors. Pressure-assisted deposition of compact pellets or thick-films are gaining popularity, necessitating studies on the pressure effects on the atomic structure and properties of the resulting material. Herein we report the phase transformation in bulk polycrystalline cesium lead bromide from its three-dimensional perovskite phase (γ-CsPbBr3) into the one-dimensional polymorph (δ-CsPbBr3) upon application of hydrostatic pressure (0.35 GPa). δ-CsPbBr3 is characterized by a wide bandgap of 2.9 eV and broadband yellow luminescence at 585 nm (2.1 eV) originating from self-trapped excitons. The formation of δ-CsPbBr3 was confirmed and characterized by Raman spectroscopy, 207Pb and 133Cs solid-state nuclear magnetic resonance, X-ray diffraction, absorption spectroscopy, and temperature-dependent and time-resolved photoluminescence spectroscopy. No such phase transition was observed in colloidal CsPbBr3 nanocrystals. 相似文献
79.
[1,3]Thiazolo[2′,3′:3,4][1,2,4]triazolo[1,5‐a]pyrimidines – A New Heterocyclic System Accessed via Bromocyclization 下载免费PDF全文
Maksym Fizer Mikhailo Slivka Eduard Rusanov Alexandr Turov Vasil Lendel 《Journal of heterocyclic chemistry》2015,52(3):949-952
A facile access to novel condensed system of [1,3]thiazolo[2′,3′:3,4][1,2,4]triazolo[1,5‐a]pyrimidine is presented. This protocol consists of bromine‐assisted direct electrophilic heterocyclization of 3‐N‐allylamine‐5,6‐dihydro[1,3]thiazolo[2,3‐c][1,2,4]triazole. The bromination took place in acetic acid and gave a good yield of the target product, which was dehydrobrominated by sodium acetate action. 相似文献
80.
Design,synthesis and structure determination of new inherently chiral para-bromoalkoxycalix[4]arenes
Oleksandr A. Yesypenko Marija A. Klyachina Maksym V. Dekhtyarenko Vladimir V. Pirozhenko Svitlana V. Shishkina Vyacheslav I. Boyko 《Supramolecular chemistry》2017,29(1):49-58
The preparative method for the synthesis of inherently chiral para-bromoalkoxycalix[4]arenes based on para-bromination, stepwise regioselective debenzoylation and the following alkylation of the readily available 25-propoxy-26,27-dibenzoyloxycalix[4]arene with propyl bromide or (R)-N-(1-phenylethyl)bromoacetamide has been developed. Three types of the inherently chiral calix[4]arenes in cone or partial cone conformations with asymmetrical (AHHHHBHH, AAHHHBHH, AHBHHCHH) substitution of both upper and lower rims have been obtained in racemic, diastereomerically pure or enantiomerically pure forms. Their structure and the absolute configuration have been determined by NMR and X-ray. 相似文献