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21.
E. S. Tkachenko A. I. Druzhinina N. V. Avramenko R. M. Varushchenko A. L. Emelina I. A. Nesterov T. N. Nesterova 《Moscow University Chemistry Bulletin》2011,66(5):282-289
The heat capacity of 4,4′-dinitrodiphenyl ether and 4-nitro-4′-biphenylcarboxylic acid were measured by adiabatic calorimetry
(AC) in temperature ranges of 8–372 K and 10–372 K, respectively. The heat capacity of 4,4′-dinitrodiphenyl ether in the temperature
range 323–500 K, the thermodynamic properties of fusion, and the purity of the ether were measured by differential scanning
calorimetry (DSC). The main thermodynamic functions in the temperature range 5–370 K were calculated for both compounds using
the heat capacities of adiabatic calorimetry. Related thermodynamic functions of 4,4′-dinitrodiphenyl ether in the temperature
range 370–500 K were calculated on the basis of DSC data. 相似文献
22.
N. V. Nesterova I. A. Samylina N. V. Bobkova A. N. Kuzmenko I. I. Krasnyuk A. A. Evgrafov 《Moscow University Chemistry Bulletin》2019,74(6):339-342
Abstract—The presence of hydroxycinnamic acids in the leaves of Malus sylvestris Mill. and Malus domestica Borkh. is established by using HPLC analysis. The quantitative determination of hydroxycinnamic acids is carried out by spectrophotometric analysis. It is found that the maximum amount of hydroxycinnamic acids accumulates in the plant during the fruiting phase. 相似文献
23.
M. A. Ilyushin A. V. Smirnov V. N. Andreev I. V. Tselinskii I. V. Shugalei O. M. Nesterova 《Russian Journal of General Chemistry》2015,85(13):2878-2885
“Green” laboratory procedures have been developed for the synthesis and purification of 5-nitrotetrazole sodium salt, a key precursor of promising energetic compounds. The procedures can be safely scaled up. 相似文献
24.
Nesterova OV Petrusenko SR Kokozay VN Skelton BW Jezierska J Linert W Ozarowski A 《Dalton transactions (Cambridge, England : 2003)》2008,(11):1431-1436
A novel heterometallic 1D coordination polymer [{Ni(en)2}2(micro-NCS)4Cd(NCS)2](n) x nCH3CN (en = ethylenediamine) has been prepared using the self-assembly process in a one-pot reaction of cadmium oxide, nickel and ammonium thiocyanates with an acetonitrile solution of ethylenediamine. The complex consists of an uncommon cis-Cd(SCN)4(NCS)2(4-) fragment and a rare combination of cis-Ni(en)2(2+) and trans-Ni(en)2(2+) building blocks linked by micro(1,3)-NCS bridges into a double-stranded zigzag chain structure. Each chain is comprised of [Ni2Cd2(micro-NCS-N,S)4)] macrocycles with chair-like and rectangular-like shapes arrayed alternately. The shortest intrachain CdCd separations are 9.535(1) and 10.868(2) A, while the nearest NiNi distances are 5.418(1) and 6.612(2) A. A network of weak N-HS hydrogen bonds, involving the terminal NCS ligands and NH2-groups of en, links the infinite chains and results in the formation of an extended supramolecular three-dimensional framework. Variable-temperature (1.8-300 K) magnetic susceptibilities show a slight change of the micro(B) value at low temperature, indicative of weak antiferromagnetic interactions (J = 1.55 cm-1) between magnetic canters. High-field, high-frequency (100-400 GHz) EPR spectra were simulated using S = 1 ground state for separate Ni2+ ions with the spin Hamiltonian parameters g = 2.165, D = 0.45 cm-1 and E = 0.03 cm(-1). According to DFT calculations, the D and E parameters are -0.35 cm(-1) and 0.049 cm-1 for the cis arrangement of Ni2+ and 0.58 cm(-1) and 0.012 cm(-1) for trans. 相似文献
25.
Synthesis of phthalocyanines with asymmetrical substitution on the periphery is often difficult due the problems in purification of the phthalocyanine mixtures obtained. Using a poly(ethylene glycol) (PEG)-based support with a Wang-type linker, we have developed the synthesis of monohydroxylated, oligoethylene glycol substituted phthalocyanines utilizing an amidine-base-promoted phthalonitrile tetramerization reaction. The use of a hydrophilic support allows symmetrical phthalocyanine product formed in solution to be readily and completely removed by washing while leaving the "AB3" product on the support. Acid cleavage with 10% trifluoroacetic acid provides the pure unsymmetrically substituted Pc. This method was applied to several metallo Pcs. Additionally, methods to avoid premature reactions on-resin that give A2B2 products are provided. 相似文献
26.
A. V. Bacheva O. V. Korobkina P. S. Nesterova V. A. Kryachkov A. G. Gabibov 《Moscow University Chemistry Bulletin》2016,71(2):97-103
Purification of the 11S proteasome regulator from mouse brain was optimized; the subunit composition of the isolated protein was determined by Western blot. The dependency of 20S proteasome peptidase activity on the molar concentration of the 11S regulator was examined. The Michaelis constants of hydrolysis of the specific fluorescent substrates Suc–Leu–Leu–Val–Tyr–AMC, Ac–Arg–Leu–Arg–AMC, and Z–Leu–Leu–Glu–AMC by the 20S proteasome from BALB/c mouse brain and the 20S–11S complex were determined. It was shown that the 11S particle has almost no influence on binding of specific fluorescent substrates to the 20S proteasome, but strongly accelerates hydrolysis of all three substrates, while not affecting the rate of peptide substrate hydrolysis by the 26S proteasome. 相似文献
27.
E. N. Gudkova N. M. Nesterova N. M. Nikolskaya V. P. Pavlyuchenko 《Bulletin of the Russian Academy of Sciences: Physics》2017,81(4):457-459
The primary cosmic ray energy spectrum at energies of 1015 to 5 × 1017 eV is presented using the results from observations by the Tien Shan HADRON array. The spectrum was obtained from the spectrum of showers according to the number of electrons using a new way of determining the parameter of spatial distribution function S of electrons. The energy spectrum can be extended to low energies up to 2 × 1013 eV using data from separate experiments at the former Tien Shan array. Conclusions are drawn regarding changes in the form of the spectrum and its chemical composition at energies over 1016 eV. The spectrum is compared to the results from the TUNKA installation. 相似文献
28.
Vitalina M. Nikitina Oksana V. Nesterova Vladimir N. Kokozay Viktoriya V. Dyakonenko Oleg V. Shishkin Julia Jezierska 《Polyhedron》2009
Four new heterometallic Cu(II)/Cr(III) complexes with N,N-dimethylethylenediamine (dmen) and its novel Schiff-base derivatives, N′-[(1Z)-3-amino-1,3-dimethylbutylidene]-N,N-dimethylethane-1,2-diamine (dmenac) and N′-((1Z)-3-{[2-(dimethylamino)ethyl]amino}-1,3-dimethylbutylidene)-N,N-dimethylethane-1,2-diamine (dmen2ac), have been easily prepared by self-assembly and characterized by spectroscopic methods and single crystal X-ray analysis. The structures of all the complexes are assisted by numerous hydrogen bonds that provide a web of interactions and mould the supramolecular architectures of the compounds. Variable-temperature (1.8–300 K) magnetic susceptibility measurements reveal Curie-Weiss paramagnetic behavior of all the compounds, supported by EPR studies. 相似文献
29.
K. A. Nuridzhanyan N. E. Mironova L. M. Nesterova 《Chemistry of Heterocyclic Compounds》1970,6(7):932-933
2-Hydroxy-1,3,5-triazines containing aryl or alkyl substituents in the 4,6 positions have been obtained only recently by the action on amidines of N-(-chloroalkylidene)carbamoyl chlorides [1] or N-acylimidic esters [2].Translated from Khimiya Geterotsiklicheskikh Soedinenii.Vol. 6,No. 7,pp. 1001–1002, July, 1970. 相似文献
30.
E. Lukevics I. Shestakova I. Domracheva A. Nesterova J. Ashaks D. Zaruma 《Chemistry of Heterocyclic Compounds》2006,42(1):53-59
A series of 2-methyl-, 4-methyl-, and 2,4-dimethyl-8-quinolineselenolates of zinc, cadmium, mercury, nickel, palladium, platinum,
arsenic, antimony, and bismuth has been synthesized and their cytotoxicity has been studied on HT-1080 (human fibrosarcoma),
MG-22A (mouse hepatoma), B16 (mouse melanoma), and Neuro 2A (mouse neuroblastoma) tumor cells. Mercury complexes were distinguished
by high cytotoxicity on all the cell lines. Palladium complexes possessed somewhat lower activity and were significantly less
toxic in relation to normal NIH 3T3 mouse embryo fibroblasts. All the studied metal 2-methyl-8-quinolineselenolates displayed
high cytotoxicity on B16 melanoma, arsenic 4-methyl-8-quinolineselenolate acted most effectively on HT-1080 and MG-22A cells.
Di(4-methyl-8-quinolyl) diselenide also possessed high cytotoxicity on these same cells.
__________
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 59–66, January, 2006. 相似文献