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1.
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
2.
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
3.
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
4.
Alifkhanova L. M. k. Petrova Yu. S. Kuznetsova K. Ya. Zemlyakova E. O. Pestov A. V. Neudachina L. K. 《Russian Journal of Applied Chemistry》2022,95(3):451-459
Russian Journal of Applied Chemistry - The process of Pd(II) sorption from hydrochloric acid solutions was studied in the pH range of 0.5–5.0 in the presence of Pt(IV) and a number of... 相似文献
5.
Lebedeva E. L. Neudachina L. K. 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2020,94(4):852-858
Russian Journal of Physical Chemistry A - A mathematical model is proposed to describe the behavior of complex compounds of metals during their separation via capillary zone electrophoresis. The... 相似文献
6.
E. V. Osintseva L. K. Neudachina Yu. G. Yatluk 《Russian Journal of Inorganic Chemistry》2010,55(10):1644-1650
The azo coupling reaction of N-(2-carboxyethyl)anthranilic acid and N,N,N′,N′-tetrabis(2-carboxyethyl)-1,3-phenylenediamine with diazosulfanilic acid yielded the complexones sodium 4-N-(2-carboxyethyl)amino-5-carboxyazobenzene-4′-sulfonate
(I) and 2,4-N,N,N′,N′-tetrabis(2-carboxyethyl)diaminoazobenzene-4′-sulfonic acid (II), respectively. The acidity constants of I and II (20°C, μ = 0.1M KCl) were determined to be as follows: for I, pK
00 = 1.29 ± 0.13, pK
0 = 2.92 ± 0.07, pK
1 = 3.92 ± 0.05, pK
2 = 5.16 ± 0.03; for II, pK
00 = 2.35 ± 0.06, pK
0 = 2.81 ± 0.09, pK
1 = 3.21 ± 0.11, pK
2 = 3.81 ± 0.09, pK
3 = 4.34 ± 0.04, pK
4 = 5.03 ± 0.06, pK
5 = 6.67 ± 0.07. The electronic absorption spectra of I and II were measured, and acid-base equilibrium scheme for I and II in aqueous solutions were suggested. The complexation constants of I and II with copper(II) ions were determined to be logK
CuQI= 5.47 ± 0.06 and logK
CuQII= 5.72 ± 0.13 (20°C, μ = 0.1 M KCl). 相似文献
7.
For a new sulfoethylated chitosan derivative with the degree of substitution of amino group hydrogen atoms of 0.5, the dissociation constant of functional groups has been determined by potentiometric titration. Complexing properties of sulfoethylated chitosan toward copper(II), cobalt(II), nickel(II), zinc(II), manganese(II), cadmium(II), silver(I), lead(II), magnesium(II), calcium(II), strontium(II), and barium(II) ions have been studied potentiometrically. Alkaline earth and magnesium ions do not form complexes with sulfoethylated chitosan. For the other ions, stability constants of the resulting complexes have been determined. The most stable N-2-sulfoethyl chitosan complexes are those with copper(II) and silver(I) ions. 相似文献
8.
L. K. Neudachina E. V. Dedyukhina O. V. Evdokimova N. V. Pechishcheva E. V. Osintseva K. Yu. Shunyaev 《Journal of Applied Spectroscopy》2010,77(2):206-212
The fluorescence properties of N,N-di(2-carboxyethyl)-p-anisidine (I) in solvents of various nature and in the crystalline state have been studied at room temperature (273 K) and at the boiling
point of liquid nitrogen (77 K). Fluorescence in aqueous solutions of I with protonated (λ
ex
/λ
fl
max
= 225/290 nm) and unprotonated (λ
ex
/λ
fl
max
= 270/380 nm) amino nitrogen has been detected. On going from aqueous solutions to nonaqueous, the fluorescence band of unprotonated
I experiences a blue shift and its intensity rises. The fluorescence intensity of the band in aprotic polar solvents is higher
than that in protic solvents. A linear dependence of the fluorescence intensity of deprotonated I on Cu(II) concentration (ranging from 1.0 to 5.0 mg/dm3) in aqueous solution has been found. The fluorescence intensity of I in aqueous solutions at 77 K and pH 1–6 has been shown to increase in the presence of Zn(II) (1–170 mg/dm3) and Cd(II) (2–330 mg/dm3) although a similar dependence is not observed at 293 K. 相似文献
9.
Neudachina L. K. Kholmogorova A. S. Puzyrev I. S. Galieva Z. R. 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2018,92(11):2309-2314
Russian Journal of Physical Chemistry A - A polysiloxane with attached groups of rubeanic acid is proposed for the extraction of silver(I), platinum(IV) and palladium(II) from dilute aqueous... 相似文献
10.