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31.
V. I. Tsaryuk K. P. Zhuravlev V. F. Zolin V. A. Kudryashova J. Legendziewicz R. Szostak 《Journal of Applied Spectroscopy》2007,74(1):51-59
We discuss the possibility of optimizing the brightness of luminescence for phenylcarboxylates, naphthylcarboxylates, and
indolylcarboxylates of europium and terbium and their adducts with 1,10-phenanthroline and 2,2′-bipyridine by modifying the
ligands. We have studied the efficiency of luminescence and luminescence excitation. We consider the effect of blocking energy
transfer from the ligands to the Eu3+ and Tb3+ ions by methylene (-CH2-) bridges dividing the π-electron system of the ligands into two parts and by the electronacceptor nitro group (-NO2). We have analyzed the pathways for transfer and degradation of the excitation energy at 77 K and 300 K. From the phosphorescence
spectra of gadolinium salts, we have determined the energies of the lowest excited triplet states of the ligands. We consider
the effect of the relative positions of the triplet levels of the ligands and the excited levels of the Eu3+ and Tb3+ ions on the luminescence efficiency. We found channels for dissipation of the excitation energy via the ππ* and nπ* states
of the aromatic system of the carboxylate and the NO2 group.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 74, No. 1, pp. 48–54, January–February, 2007. 相似文献
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34.
A. B. Mirgorodskaya E. I. Yatskevich Yu. R. Kudryashova S. E. Solov’eva I. S. Antipin L. Ya. Zakharova A. I. Konovalov 《Kinetics and Catalysis》2011,52(4):529-535
The rate of carboxylic ester cleavage by amphiphilic low-molecular-weight and polymeric amines in the presence of polyoxyethylated calix[4]arenes with different degrees of oxyethylation is determined by the formation of mixed aggregates, by the shift of pK a of the amine, and the character of the distribution of the reactants in functional micelles. All of the systems show a high substrate specificity. In the case of octyl- and decylamines, the reaction of p-nitrophenyl acetate is catalyzed and the reaction of more hydrophobic p-nitrophenyl laurate is inhibited. An opposite situation is observed in the systems based on branched polyethyleneimine: the reaction of p-nitrophenyl acetate is inhibited and the process involving p-nitrophenyl laurate is accelerated. 相似文献
35.
Maksimov A. F. Kutyrev G. A. Zhukova A. A. Kudryashova D. A. Kutyreva M. P. 《Russian Chemical Bulletin》2021,70(4):672-676
A new hybrid adsorbent based on zeolite modified with hyperbranched polyesterpolybenzoylthiocarbamate is presented. The structure and morphology of the sorbent are characterized by potentiometric titration, IR, 1H and 13C NMR spectroscopy, and electron microscopy. The fundamental possibility of extracting transition metal ions has been demonstrated using the examples of CuII and CoII ions. It is shown that the sorption capacity of the adsorbent to CuII salt is 25.34 mg g?1. A method of sorbent regeneration is proposed.
相似文献36.
Tychinina A. S. Skuredina A. A. Le-Deygen I. M. Kudryashova E. V. 《Colloid Journal》2021,83(6):794-801
Colloid Journal - The effect of substituents (polar CH2CH(OH)CH3, hydrophobic CH3, and charged $${{\left( {{\text{C}}{{{\text{H}}}_{{\text{2}}}}} \right)}_{{\text{4}}}}{\text{SO}}_{3}^{ - }$$ ) in... 相似文献
37.
K. V. Sukhoverkov N. N. Sokolov O. Yu. Abakumova O. V. Podobed E. V. Kudryashova 《Moscow University Chemistry Bulletin》2016,71(2):122-126
The ChitoPEGylation method, which is a novel approach to regulating the catalytic properties of enzymes that is based on the formation of a covalent conjugate of an enzyme with branched copolymers of chitosan, has been developed. The efficiency of this method has been demonstrated using a new recombinant preparation of L-asparaginase from Erwinia carotovora (EwA) as a model. The molecular architecture and composition of EwA conjugates with PEG–chitosans have been optimized. It has been shown that the decisive factors that affect the activity of the EwA conjugates are the molecular weight of and PEGylation degree of chitosan. It has been found that the EwA conjugation with PEG–chitosan increases, its cytostatic activity against human chronic myeloid leukemia K562 cells, Burkitt’s lymphoma Raji cells, and acute lymphoblastic leukemia Jurkat cells. These data provide new approaches to the synthesis of L-asparaginase preparations with improved biocatalytic properties. 相似文献
38.
Phase and conversion equilibria in the quaternary reciprocal water–salt system 2HCOONa + CaCl2 ? (HCOO)2Ca + 2NaCl–H2O at 25°C were studied for the first time to determine the concentration parameters of the production of calcium formate from sodium formate. 相似文献
39.
O. S. Kudryashova S. F. Kudryashov L. N. Malinina 《Russian Journal of Inorganic Chemistry》2009,54(10):1664-1668
This is the first study of solubility in the NaCl-NH4Cl-KCl-H2O four-component water-salt system at 25, 50, and 75°C. Phase fields of individual salts and potassium and ammonium chloride
solid solutions were demarcated. Experimental data were used to develop a mathematical model of the K+, Na+, NH4+/Cl−, Cr2O72−-H2O five-component reciprocal system, which includes the title four-component system. 相似文献
40.
Vorozhtsov S. A. Kudryashova O. B. Lerner M. I. Vorozhtsov A. B. Khrustalyov A. P. Pervikov A. V. 《Russian Physics Journal》2017,60(7):1248-1254
Russian Physics Journal - The authors consider and evaluate the physical parameters and regularities of the process of consolidation of Fe–Cu, Cu–Nb, Ag–Ni, Fe–Pb... 相似文献