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Voskresenskaya Olga O. Skorik Nina A. 《Monatshefte für Chemie / Chemical Monthly》2020,151(4):533-542
Monatshefte für Chemie - Chemical Monthly - A comparative analysis is performed on the stability constants $${\upbeta }_{1yn}$$ and intramolecular redox decomposition rate constants $$k_{n\; =... 相似文献
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V. I. Zhukov G. V. Val’kovich B. N. Skorik Yu. M. Petrov G. P. Belov 《Russian Journal of Applied Chemistry》2007,80(7):1195-1200
Analysis of mass and heat balance in the reaction node of the process of ethylene dimerization into but-1-ene under the industrial
conditions is performed. It is found that ethylene concentration in the reactor liquid phase by a complex way depends on the
reactor temperature, pressure and but-1-ene concentration in the liquid phase. Optimal process temperature is 80–90°C, operating
pressure in the reactor is 0.6–0.8 MPa. Increase in pressure above 1 MPa practically excludes heat withdraw via but-1-ene
evaporation and makes the system of heat withdrawing ineffective. 相似文献
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Skorik Yu. A. Neudachina L. K. Osintsev A. V. Yatluk Yu. G. Vshivkov A. A. Osintseva E. V. 《Russian Journal of Organic Chemistry》2002,38(3):385-389
4-[4-Bis(2-carboxyethyl)aminophenylazo]benzenesulfonic acid and 4-[2-bis(2-carboxyethyl)amino-4,5-dimethylphenylazo]benzenesulfonic acid were synthesized for the first time by azo coupling of diazosulfanilic acid with N,N-bis(2-carboxyethyl)aniline and N,N-bis(2-carboxyethyl)-3,4-xylidine, respectively. The acid ionization constants of the products were determined, their electron absorption spectra were measured, and schemes of acid-base equilibria in aqueous solution were proposed. 相似文献
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Spectrophotometry, pH-metry, and kinetic method were applied to study the complexation and redox decomposition of cerium hydroxo complexes formed in the systems Ce4
+-SO4
2--H
m
L, where H
m
L (m = 2, 3, 4) are, respectively lactic, malic, and tartaric acids. 相似文献
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V. Yu. Korotaev Yu. A. Skorik A. Yu. Barkov M. I. Kodess A. Ya. Zapevalov 《Russian Chemical Bulletin》2005,54(11):2545-2549
3,3,3-Trifluoro-N′-(3-trifluoromethylphenyl)-1,2-propanediamine (5) was synthesized by the reaction of 2-diazo-1,1,1-trifluoro-3-nitropropane or 3,3,3-trifluoro-1-nitropropene with 3-aminobenzotrifluoride
followed by the reduction of the nitro group. The Michael 1,4-addition of diamine 5 to acrylic acid occurs only at the N(1) atom and affords N-mono-or N,N-dicarboxyethyl derivatives 6 and 7, depending on the reactant ratio. Protolytic equilibria 5–7 in aqueous solutions were studied by pH-potentiometry and UV spectroscopy. Only the aliphatic amino group can be protonated
in an aqueous solution, while the aromatic amino group remains unprotonated even in 12 M HCl. The stability constants of transition metal (Cu2+, Ni2+, Zn2+) complexes with ligands 5–7 were determined by pH-potentiometric titration. The stability of the complexes and selectivity of the ligands toward Cu2+ ions increase with an increase in the number of N-carboxyethyl groups.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2465–2469, November, 2005. 相似文献
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Skorik Yu. A. Romanenko G. V. Neudachina L. K. Vshivkov A. A. 《Russian Journal of Coordination Chemistry》2001,27(11):796-802
Crystals of [Cu(o-Andp)(H2O)2] · 2H2O (where o-Andp2–is -anisidine-N,N-di-3-propionate) were synthesized and studied using X-ray diffraction analysis. The crystals are triclinic: a= 12.063(1) Å, b= 12.483(3) Å, c= 13.586(2) Å, = 91.29(1)°, = 111.67(1)°, = 104.00(1)°, V= 1830.5(5) Å3, space group P
, Z= 2, and R= 0.0528 for 5965 reflections with I2(I). The two crystallographically independent complexes are isostructural. The tetragonal–bipyramidal coordination of copper(III) involves three O atoms, the N atom of the tetradentate ligand o-Andp2–, and two O atoms from water. The aminodipropionate group of the ligand (average Cu–O 1.939 Å and Cu–N 2.051 Å) and one of the coordinated water molecules (Cu–O(w) 1.991 Å) lie in the equatorial plane. The second water molecule (Cu–O(w) 2.32 Å) and the methoxy O atom of o-Andp2–(Cu–O 2.37 Å) are in the apical positions of the bipyramid. 相似文献
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Yu. G. Yatluk N. A. Zhuravlev O. V. Koryakova L. K. Neudachina Yu. A. Skorik 《Russian Chemical Bulletin》2005,54(8):1836-1841
A series of new hybrid organo-inorganic sorbents with the 3-aminopropionate chelating group was synthesized. The synthesis
includes the copolycondensation (sol—gel method) of tetraethoxysilane, 3-aminopropyltriethoxysilane, and several modifiers
(MeSi(OEt)3, EtSi(OEt)3, Ti(OEt)4, AlONO3, ZrOCl2) followed by carboxyethylation with acrylic acid. The obtained chelating sorbents were characterized by elemental analysis,
FT-IR and 1H NMR spectroscopy, and thermogravimetry. The N-carboxylated sorbents have a higher sorption capacity with respect to metal ions (0.5–0.9 mmol g−1, pH 6.3, NH4OAc, 20 °C) than the starting sorbents with the primary amino group (0.05–0.2 mmol g−1) and manifest high selectivity for copper(II) ion extraction.
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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1783–1788, August, 2005. 相似文献
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The stability constants of 1: 1 and 1: 2 acidic copper(II) violurate complexes and the CuL complex, where L is the anion of
violuric acid (H2L), were determined by pH-metry at ionic strength I = 0.1 at 20°C. The stability of the violurate complexes of triply charged cations [ML]+ and quadruply charged thorium [ThL]2+ increases in the sequence La3+, Gd3+, Y3+, Sc3+, Th4+, Fe3+. It was shown that violuric acid behaves as either mono- or dibasic, depending on the conditions, with respect to all of
these cations. 相似文献