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1.
Shepeleva I. I. Shokurov A. V. Bogdanova L. B. Arslanov V. V. Panchenko P. A. Fedorova O. A. Selektor S. L. 《Russian Chemical Bulletin》2018,67(12):2259-2261
Russian Chemical Bulletin - It was demonstrated that, in contrast to a solution in an organic solvent, the relaxation of the excited state of a fluorophore moiety proceeds mainly radiationless upon... 相似文献
2.
M. A. Kalinina O. A. Raitman D. S. Turygin S. L. Selektor N. V. Golubev V. V. Arslanov 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2008,82(8):1334-1342
A sensitive membrane of a new type was suggested for the determination of calcium ions in aqueous solutions. Polylayer membranes were formed by the Langmuir-Blodgett method from octadecylamine and 1,2-bis-(2-aminophenoxy)ethane-N,N,N,N-tetraacetic acid. When brought in contact with an aqueous solution of a calcium salt, the ultrathin film sorbs metal ions. The chelator then transports metal ions over the whole membrane volume, and the ions are accumulated in the form of calcium hydroxide crystallites in regions enriched in the diphilic base. The main analytic parameters were determined by piezoquartz weighing, electrochemical impedance spectroscopy, and surface plasmon resonance spectroscopy. The response of sensor elements of this type was shown to be a linear function of the logarithm of the concentration of calcium ions over the concentration range 10?8–10?1 mol/l at the contact time between the film and the solution under study no more than 10 s. The conclusion was drawn that the membranes obtained remained highly sensitive with respect to calcium ions in 0.1 M solutions of NaCl and were selective with respect to other biologically relevant cations. 相似文献
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Selektor S. L. Semyachkin M. Yu. Arslanov V. V. 《Russian Journal of Applied Chemistry》2003,76(8):1331-1336
A new composite hardener for epoxy adhesives, based on a heteropoly acid, was suggested, and its formula was optimized. The curing kinetics and the physicomechanical and adhesion properties of the cured material were studied. The advantages of the new material over traditional epoxy adhesives were demonstrated, and the ways to control its characteristics were found. 相似文献
5.
V. V. Arslanov Yu. G. Gorbunova S. L. Selektor L. S. Sheinina O. G. Tselykh Yu. Yu. Enakieva A. Yu. Tsivadze 《Russian Chemical Bulletin》2004,53(11):2532-2541
Tetra-15-crown-5-phthalocyanine ligand and its ruthenium complex with axial CO and MeOH groups were synthesized. The properties of their monolayers and Langmuir-Blodgett films were studied. In the case of the ligand, monolayer films of molecular associates are formed. The compatibility of the ligand and stearic acid in a mixed binary monolayer was established. Stearic acid improves the ligand distribution over the water surface and results in the formation of monolayer associates immobilized in its matrix. The condensation effect of Na+ cations on the mixed monolayers was found. The ruthenium complex (R4Pc)Ru(MeOH)(CO) forms stable true monolayers. The macrocycle planes in stacking are inclined relatively to the normal to the subphase surface by an angle of 25°. The Langmuir-Blodgett films of the complex were established to have redox peaks. A high electrochemical stability of the Langmuir-Blodgett films and a high electroactivity of phthalocyanine rings were demonstrated. It was shown by impedance spectroscopy that the binding of Na+ and K+ ions by Langmuir-Blodgett films of the (R4Pc)Ru(MeOH)(CO) complex results in an increase in the impedance values in a region of medium frequencies by three and five times, respectively.__________Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2426–2435, November, 2004. 相似文献
6.
Artificial Iono‐ and Photosensitive Membranes Based on an Amphiphilic Aza‐Crown‐Substituted Hemicyanine
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Dr. Pinar Batat Dr. Christine Grauby‐Heywang Dr. Sophiya Selektor Daria Silantyeva Prof. Vladimir Arslanov Dr. Nathan McClenaghan Dr. Gediminas Jonusauskas 《Chemphyschem》2014,15(13):2823-2833
Artificial iono‐ and photosensitive membranes based on an amphiphilic aza‐crown‐substituted hemicyanine are assembled on liquid and solid supports and their aggregation behaviour, which is influenced by the binding of metal cations and surface density, is studied. The photoinduced charge‐transfer properties of an analogous non‐amphiphilic hemicyanine in solution are also demonstrated. An asymmetric sandwich dimer model is proposed and existence of such dimers in solution is evidenced by transient absorption and fluorescence anisotropy experiments. Changes in absorption and emission spectra, as well as compression isotherms of the amphiphile observed in the presence of cations, are discussed in terms of 2D molecular reorganisation. Surface‐pressure‐controlled reversible excimer formation at the air–water interphase and excimer‐type emission of Langmuir–Blodgett films in the presence of cations are demonstrated and are discussed on the basis of fibre‐optic fluorimetry and fluorescence microscopy results. 相似文献
7.
S. L. Selektor A. V. Shokurov O. A. Raitman L. S. Sheinina V. V. Arslanov K. P. Birin Yu. G. Gorbunova A. Yu. Tsivadze 《Colloid Journal》2012,74(3):334-345
The spectral, electrochemical, and optical properties of Langmuir-Blodgett films (LBFs) and cast films from a solution of new double-decker cerium bis[tetra-(15-crown-5)-phthalocyaninate] (Ce(R4Pc)2) are studied. Based on analysis of compression isotherms and quantum-chemical calculations, schemes of the organization of Ce(R4Pc)2 molecules at different states of its monolayers are proposed. Correlation dependences are determined in order to relate the optical and electrochemical characteristics of monolayers and LBFs of sandwich-type lanthanide phthalocyaninates to the ionic radii of their metal centers. The valent state of Ce ions in a monolayer-forming complex is determined, and a sequence of redox transformations occurring in LBF uppon appliance of a potential is proposed, one of the transformations being associated with the Ce3+/Ce4+ redox transition. Orientation-induced intramolecular electron transfer is revealed in the planar supramolecular system. It is shown that, during the formation of a monolayer from a Ce(R4Pc)2 solution, a tetravalent metal center passes to a trivalent state. Monolayer compression to a high surface pressure reverts the complex to the electronic state typical of the solution. The reversible transformations observed upon the monolayer compression result from intramolecular electron transfer from the 4f-orbital of Ce to the phthalocyanine ring and backwards. The high operation rate and the reversibility of switching between the stable states, which are determined by means of the surface plasmon resonance technique, upon a stepwise change in the electrode potential within the range of 200?C850 mV may underlie the development of optoelectronic systems. With a large number of molecules in a stacking aggregate, changes in the distance between the decks of the complex that occur with changes in the oxidation level of the metal center can substantially modulate the sizes of molecular ensembles. A supramolecular device capable of performing mechanical work can be developed based on this effect. 相似文献
8.
Alexander V. Shokurov Daria S. Kutsybala Andrey P. Kroitor Alexander A. Dmitrienko Alexander G. Martynov Yulia Yu. Enakieva Aslan Yu. Tsivadze Sofiya L. Selektor Yulia G. Gorbunova 《Molecules (Basel, Switzerland)》2021,26(14)
Coordination-induced spin crossover (CISCO) in nickel(II) porphyrinates is an intriguing phenomenon that is interesting from both fundamental and practical standpoints. However, in most cases, realization of this effect requires extensive synthetic protocols or extreme concentrations of extra-ligands. Herein we show that CISCO effect can be prompted for the commonly available nickel(II) tetraphenylporphyrinate, NiTPP, upon deposition of this complex at the air/water interface together with a ruthenium(II) phthalocyaninate, CRPcRu(pyz)2, bearing two axial pyrazine ligands. The latter was used as a molecular guiderail to align Ni···Ru···Ni metal centers for pyrazine coordination upon lateral compression of the system, which helps bring the two macrocycles closer together and forces the formation of Ni–pyz bonds. The fact of Ni(II) porphyrinate switching from low- to high-spin state upon acquiring additional ligands can be conveniently observed in situ via reflection-absorption UV-vis spectroscopy. The reversible nature of this interaction allows for dissociation of Ni–pyz bonds, and thus, change of nickel cation spin state, upon expansion of the monolayer. 相似文献
9.
E. G. Boos V. V. Samojlov Zh. S. Takibaev M. A. Tashinov T. Temiraliev B. V. Batyunya I. V. Boguslavsky N. A. Buzdavina I. M. Gramenitsky V. G. Ivanov R. Lednický L. A. Tikhonova A. Valkárová V. Vrba Z. Zlatanov I. Ervanne S. Ljung R. Orava H. Villanen P. Villanen J. Patočka B. V. Korolev Ya. M. Selektor V. N. Shulyachenko V. F. Turov P. K. Dementiev E. M. Lejkin A. G. Pavlova N. A. Pozhidaeva V. T. Rud L. Rob J. Záček J. Böhm J. Chýla J. Cvach I. Herynek P. Reimer J. Sedlák V. šimák 《Czechoslovak Journal of Physics》1976,26(11):1281-1289
The inclusive spectra for ¯pp collisions at 22·4 GeV/c are investigated. The transversal momentum distribution resembles the corresponding one in high energy pp interactions. The cross section in the central region is 28±mb. They
*-distribution of secondary particles in the central region indicates a charge asymmetry with the asymmetry parameter having the value 0.15±0·01. The upper limit of the diffraction dissociation of the beam particle is estimated to be
mb.The authors want to express their gratitude to the staff responsible for the operation of the Serpukhov accelerator and of the beam channel no. 9 and to the technical staff of the LUDMI-LA HBC. We also thank the technicians and assistants at all laboratories for their excellent work. The authors from the Moscow State University want to express their gratitude to Prof. V. G.Shevchenko for his continuous support of this work. 相似文献
10.
Shepeleva I. I. Shokurov A. V. Konovalova N. V. Arslanov V. V. Panchenko P. A. Selektor S. L. 《Russian Chemical Bulletin》2018,67(12):2159-2163
Russian Chemical Bulletin - The efficiency of the Förster resonance energy transfer (FRET) in a monolayer film containing the energy donor and energy acceptor fluorophores is low since the... 相似文献