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Yu. G. Denisenko,A. S. Aleksandrovsky,V.V.Atuchin,A. S. Krylovg,M. S. Molokeev,A. S. Oreshonkov,N. P. Shestakov,O. V. Andreev 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.68 No.-
Eu2(SO4)3 was synthesized by chemical precipitation method and the crystal structure was determined by Rietveld analysis. The compound crystallizes in monoclinic space group С2/с. In the air environment, Eu2(SO4)3 is stable up to 670 °C. The sample of Eu2(SO4)3 was examined by Raman, Fourier-transform infrared absorption and luminescence spectroscopy methods. The low site symmetry of SO4 tetrahedra results in the appearance of the IR inactive ν1 mode around 1000 cm−1 and ν2 modes below 500 cm−1. The band intensities redistribution in the luminescent spectra of Eu3+ ions is analyzed in terms of the peculiarities of its local environment.
High-temperature oxidation of europium (II) sulfide
Yuriy G. Denisenko,Maxim S. Molokeev,Alexander S. Krylov,Aleksandr S. Aleksandrovsky,Aleksandr S. Oreshonkov,Victor V. Atuchin,Nikita O. Azarapin,Pavel E. Plyusnin,Elena I. Sal’nikova,Oleg V. Andreev 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.79 No.-
The process of high-temperature oxidation of EuS in the air was explored in the temperature range of500–1000 C. The oxidation reaction enthalpy was determined (DH0exp =1718.5 kJ/mol). The study ofoxidation products allowed to establish the mechanism of EuS oxidation with oxygen. At 500–600 C, EuSis oxidized to a mixture of Eu3+-containing compounds (Eu3S4, Eu2O2S). In the range of 700–1000 C, onlyeuropium oxysulfate Eu2O2SO4 is formed. The structure refinement for Eu2O2SO4 was performed by theRietveld method. The luminescence intensity of europium oxysulfate Eu2O2SO4 with characteristic 4f-4ftransitions from the 5D0 state was investigated as a function of oxidation temperature.
Shubina, Larisa K.,Makarieva, Tatyana N.,Denisenko, Vladimir A.,Dmitrenok, Pavel S.,Dyshlovoy, Sergey A.,von Amsberg, Gunhild,Glazunov, Valery P.,Silchenko, Artem S.,Stonik, Inna V.,Lee, Hyi-Seung NATURAL PRODUCT COMMUNICATIONS 2016 Natural product communications Vol.11 No.9
<P>As a result of the first study on secondary metabolites from the cosmopolitan bioluminescent marine tube polychaete Chaetopterus variopedatus, a new bicyclic guanidine alkaloid, 6-epi-monanchorin (1), along with the previously known monanchorin (2) were isolated. The structure of 1 was elucidated by spectroscopic and chemical methods, including a cleavage of the C-1-O-7 bond to obtain a secondary alcohol (3), which was used to determine the absolute configurations by Mosher's method. It was found that 1 and 2 were mainly accumulated in a secreted mucus special organ of the worm (food net), where green and blue-green microalgae were detected. A biosynthetic pathway to 6-epi-monanchorin and monanchorin from dietary polyenic fatty acid precursors was proposed.</P>
Guzii, Alla G.,Makarieva, Tatyana N.,Denisenko, Vladimir A.,Dmitrenok, Pavel S.,Kuzmich, Aleksandra S.,Dyshlovoy, Sergey A.,von Amsberg, Gunhild,Krasokhin, Vladimir B.,Stonik, Valentin A. American Chemical Society 2016 ORGANIC LETTERS Vol.18 No.14
<P>Melonoside A (<B>1</B>), the first representative of a new class of ω-glycosylated fatty acid amides, was isolated from the Far Eastern marine sponge <I>Melonanchora kobjakovae</I>. The structure of <B>1</B>, including absolute configuration, was established using detailed analysis of 1D and 2D NMR, CD, and mass spectra as well as chemical transformations. Compound <B>1</B> induces autophagy of human cisplatin-resistant germinal tumor cells NCCIT-R.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/orlef7/2016/orlef7.2016.18.issue-14/acs.orglett.6b01678/production/images/medium/ol-2016-01678y_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ol6b01678'>ACS Electronic Supporting Info</A></P>
Olesya I. Zhuravleva,Shamil Sh. Afiyatullov,Olesya S. Vishchuk,Vladimir A. Denisenko,Natalya N. Slinkina,Olga F. Smetanina 대한약학회 2012 Archives of Pharmacal Research Vol.35 No.10
A new decaline derivative, decumbenone C (1) along with four known compounds, decumbenones A (2) and B (3), diorcinol (4), and brevianamide F (5) were isolated from the marine fungus Aspergillus sulphureus KMM 4640. Decumbenone C shows potent cytotoxic activity against SK-MEL-5 human melanoma cells with IC50 values of 0.9 μM.
Synthesis and luminescence properties of β-NaRE0.95Eu0.05F4 (RE¼Y, Lu)
Illariia A. Razumkova,Alexander E. Sedykh,Yuriy G. Denisenko,Klaus Müller-Buschbaum 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.92 No.-
On the base of β-NaYF4 and β-NaLuF4 compounds, optimal synthesis methods were selected to obtainhighly crystalline Eu3+-doped compounds in the hexagonal (β) structure. The compounds β-NaY0.95Eu0.05F4 and β-NaLu0.95Eu0.05F4 were synthesized by hydrothermal synthesis. The concentrationof Na2EDTA introduced into the reaction system as a modifier affects the shape and size of the productfrom elongated hexagonal prisms to quartz-like crystals. The thermal behavior of the compounds hasbeen studied; the temperature of the polymorphic transition from hexagonal to cubic structure is 680 Cfor β-NaY0.95Eu0.05F4 and 624 C for β-NaY0.95Eu0.05F4, the melting point of α-NaRE0.95Eu0.05F4 is about900 C. Under excitation with UV-light of l = 393 nm, β-NaY0.95Eu0.05F4 and β-NaLu0.95Eu0.05F4 show theemission lines of direct Eu3+ f-f transitions, with the presence of the emission from higher Eu3+ excitedstates (up to 5H3) in both samples, which is responsible for the more orange color of emission instead ofthe usual red for Eu3+. Emission decay times are slightly longer for β-NaY0.95Eu0.05F4 than for β-NaLu0.95Eu0.05F4, which is the result of a bigger unit cell for the former, leading to longer interatomicdistances between Eu3+ ions in the lattice. The luminescence mechanisms for the doped lanthanide ionswere thoroughly analyzed.
Makarieva, Tatyana N.,Tabakmaher, Ksenya M.,Guzii, Alla G.,Denisenko, Vladimir A.,Dmitrenok, Pavel S.,Shubina, Larisa K.,Kuzmich, Alexandra S.,Lee, Hyi-Seung,Stonik, Valentin A. American Chemical Society and American Society of 2011 Journal of natural products Vol.74 No.9
<P>New unusual polycyclic guanidine alkaloids monanchocidins B–E (<B>2</B>–<B>5</B>) along with monanchocidin A (<B>1</B>), which we recently described, were isolated from the Far-Eastern marine sponge <I>Monanchora pulchra</I>. Their structures were established using spectroscopic data and chemical transformations. Compounds <B>1</B>–<B>5</B> show potent cytotoxic activities against HL-60 human leukemia cells with IC<SUB>50</SUB> values of 540, 200, 110, 830, and 650 nM, respectively.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jnprdf/2011/jnprdf.2011.74.issue-9/np200452m/production/images/medium/np-2011-00452m_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/np200452m'>ACS Electronic Supporting Info</A></P>
Lim, Chang Sung,Atuchin, Victor V.,Aleksandrovsky, Aleksandr S.,Denisenko, Yuriy G.,Molokeev, Maxim S.,Oreshonkov, Aleksandr S. Materials Research Society of Korea 2019 한국재료학회지 Vol.29 No.12
New triple tungstate phosphors NaPbLa(WO<sub>4</sub>)<sub>3</sub>:Yb<sup>3+</sup>/Ho<sup>3+</sup> (x = Yb<sup>3+</sup>/Ho<sup>3+</sup> = 7, 8, 9, 10) are successfully fabricated by microwave assisted sol-gel synthesis and their structural and frequency upconversion (UC) characteristics are investigated. The compounds crystallized in the tetragonal space group I4<sub>1</sub>/a and the NaPbLa(WO<sub>4</sub>)<sub>3</sub> host have unit cell parameters a = 5.3927(1) and c = 11.7961(3) Å, V = 343.05(2) Å<sup>3</sup>, Z = 4. Under excitation at 980 nm, the phosphors have yellowish green emissions, which are derived from the intense <sup>5</sup>S<sub>2</sub>/<sup>5</sup>F<sub>4</sub>→<sup>5</sup>I<sub>8</sub> transitions of Ho<sup>3+</sup> ions in the green spectral range and strong <sup>5</sup>F<sub>5</sub>→<sup>5</sup>I<sub>8</sub> transitions in the red spectral range. The optimal Yb<sup>3+</sup>:Ho<sup>3+</sup> ratio is revealed to be x = 9, which is attributed to the quenching effect of Ho<sup>3+</sup> ions, as indicated by the composition dependence. The UC characteristics are evaluated in detail under consideration of the pump power dependence and Commission Internationale de L'Eclairage chromaticity. The spectroscopic features of Raman spectra are discussed in terms of the superposition of Ho<sup>3+</sup> luminescence and vibrational lines. The possibility of controlling the spectral distribution of UC luminescence by the chemical content of tungstate hosts is demonstrated.
New Derivatives of Natural Acyclic Guanidine Alkaloids with TRPV Receptor-Regulating Properties
Ogurtsova, Ekaterina K.,Makarieva, Tatyana N.,Korolkova, Yuliya V.,Andreev, Yaroslav A.,Mosharova, Irina V.,Denisenko, Vladimir A.,Dmitrenok, Pavel S.,Lee, Yeon-Ju,Grishin, Eugene V.,Stonik, Valentin NATURAL PRODUCT COMMUNICATIONS 2015 Natural product communications Vol.10 No.7