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Общее количество найденных документов : 63
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1.
Инвентарный номер: нет.
   

   
    3,3,3-Trifluoro-N-(3-trifluoromethylphenyl)-1,2-propanediamine and its N-mono-and N,N-dicarboxyethyl derivatives: synthesis, protolytic and complexation properties [Electronic resource] / V. Yu. Korotaev, Yu. A. Skorik, A. Yu. Barkov, M. I. Kodess, A. Ya. Zapevalov // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2005. - Vol. 54, № 11. - P2545-2549
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: 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

\\\\Expert2\\nbo\\Russian Chemical Bulletin\\2005, 54 (11), 2545.pdf
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2.
Инвентарный номер: нет.
   
   A 10

   
    A new route to 6,6 ''-dicyano-2,2':6 ',2 ''-terpyridines and their complexes with Ni(II) [Text] / D. N. Kozhevnikov, V. N. Kozhevnikov, T. V. Nikitina, V. L. Rusinov, O. N. Chupakhin, I. L. Eremenko, G. G. Aleksandrov // Tetrahedron Letters. - 2002. - Vol. 43, № 28. - P4923-4925
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
SYNTHESIS -- TERPYRIDINES
Аннотация: A new methodology for the synthesis of functionalised 2,2?:6?,2??-terpyridine systems is suggested: sequential synthesis of the heterocyclic assemblies based on the 1,2,4-triazine ring, direct introduction of the cyano group in the 1,2,4-triazine ring and the transformation of the latter to a pyridine ring via an aza-Diels–Alder reaction????

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3.
Инвентарный номер: нет.
   
   B 59

   
    Binding Ni(II) ions to chitosan and its N-heterocyclic derivatives: Density functional theory investigation / A. S. Portnyagin, S. YU. Bratskaya, A. V. Pestov, A. Voit // Computational and Theoretical Chemistry. - 2015. - Vol. 1069. - С. 4-10
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
Ni(II) -- CHITOSAN -- N-HETEROCYCLIC DERIVATIVES

\\\\expert2\\NBO\\Computational and Theoretical Chemistry\\2015.1069.4-10.pdf
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4.
Инвентарный номер: нет.
   
   C 31

   
    Catalytic effect of nanosized metal oxides on the knoevenagel reaction / Yu. A. Titova, O. V. Fedorova, I. G. Ovchinnikova, G. L. Rusinov, V. N. Charushin // Russian Journal of Applied Chemistry. - 2012. - Vol.85, №4. - С. 656-660
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
CATALYTIC EFFECT -- METAL OXIDES -- KNOEVENAGEL REACTION
Аннотация: The effect of nanosized metal oxides (Al, Mg, Cu, Ni oxides) on the synthesis of chalcones that are key intermediate in the synthesis of Nitrendipine and Felodipine drugs was examined

\\\\Expert2\\nbo\\Russian Journal of Applied Chemistry\\2012, v. 85, N 4, p.656.pdf
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5.
Инвентарный номер: нет.
   
   C 74

   
    Complexes of mono- and bis(2-carboxyethyl)-2-picolylamine: Synthesis and crystal and molecular structures [Electronic resource] / A. V. Pestov, A. E. Permyakov, P. A. Slepukhin, L. K. Neudachina, Yu. G. Yatluk // Russian Journal of Coordination Chemistry. - 2010. - Vol. 36, № 10. - P769-777
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: N-(2-Pyridylmethyl)iminodipropionic (I) and N-(2-pyridylmethyl)-3-aminopropionic acids (II) were obtained. A reaction of acid I with a Cu(II) salt gave a 2: 2 complex (III); a reaction of acid II with a Ni(II) salt yielded a 1 : 2 complex (IV). The crystal structures of these complexes were determined by X-ray diffraction. The abilities of compounds I and II to form complexes were compared with the literature data for other ligands containing the N-(2-pyridylmethyl)amino fragment. The structural features of the chelate complexes with 2-aminomethylpyridine derivatives were revealed, depending on the other substituents and the metal center

\\\\Expert2\\nbo\\Russian Journal of Coordination Chemistry\\2010, v. 36, N. 10, p.769.pdf
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6.
Инвентарный номер: нет.
   
   C 73

   
    Condensation of fluoroalkyl-containing 1,2,3-trione 2-arylhydrazones with methylamine [Electronic resource] / E. V. Shchegol'kov, Ya. V. Burgart, P. A. Slepukhin, O. N. Kazheva, V. I. Saloutin // Russian Journal of Organic Chemistry (Translation of Zhurnal Organicheskoi Khimii). - 2007. - Vol. 43, № 12. - P1788-1796
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Fluoroalkyl-containing 1,2,3-trione 2-arylhydrazones react with methylamine in different ways, depending on the substrate structure. Arylhydrazones having a short fluoroalkyl substituent (RF = CF3, HCF2CF2) react at the carbonyl group adjacent to the nonfluorinated substituent to give 3-alkyl(aryl)-2-aryldiazenyl-3-methylamino-1-polyfluoroalkylprop-2-en-1-ones. Arylhydrazones with a long-chain fluoroalkyl group (RF = C3F7 and longer) and a bulky nonfluorinated group take up methylamine molecule at the carbonyl group linked to the fluorinated substituent, and the subsequent haloform reaction yields N-methyl-2-arylhydrazono-3-oxobutanamides. Both types of products are formed in reactions of methylamine with 1,2,3-triketone 2-arylhydrazones having a long fluoroalkyl group and methyl group at the other carbonyl group. Template condensation of fluoroalkyl-containing 1,2,3-trione 2-arylhydrazones with methylamine over Ni(II) template gives bis[3-alkyl(aryl)-1-polyfluoroalkyl-3-methylamino-2-aryldiazenylprop-2-en-1-onato-N,N?]-nickel(II), regardless of the size of the fluoroalkyl substituent. The same complexes and their copper analogs can be obtained by treatment of 3-alkyl(aryl)-2-aryldiazenyl-3-methylamino-1-polyfluoroalkylprop-2-en-1-ones with the corresponding metal salts

\\\\Expert2\\nbo\\Russian Journal of Organic Chemistry\\2007, 43 (12), 1788.pdf
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7.
Инвентарный номер: нет.
   
   S 66

    Skorik, Yu. A.
    Evaluation of various chitin-glucan derivatives from Aspergillus niger as transition metal adsorbents [Text] / Yu. A. Skorik, A. V. Pestov, Yu. G. Yatluk // Bioresource Technology . - 2010. - Vol. 101, № 6. - P1769-1775
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: A number of chelating resins were prepared by chemical derivatization of the chitin-glucan (CG) complex isolated from Aspergillus niger biomass, namely chitosan-glucan (CsG), O-carboxymethyl-chitin-glucan (CM-CG), O-(2-sulfoethyl)chitin-glucan (SE-CG), and N-(2-carboxyethyl)chitosan-glucan (CE-CsG). The chemical modification was confirmed by FT-IR and elemental analysis. Nanosecond electron beam irradiation was used to produce insoluble resins and to preserve the reactive functional groups. Batch experiments were carried out to evaluate the adsorption selectivity and capacity of the resins toward transition metal ions (Cu2+, Ni2+, Co2+, Zn2+). The resins showed good adsorption capability with the following selectivity series: Co2+ Ni2+ Cu2+ Zn2+. The total metal adsorption capacities of CG, CsG, CM-CG, SE-CG, and CE-CsG resins at pH 6.5 (ammonium acetate buffer) were found to be 0.205, 0.382, 1.752, 0.319, and 0.350 mmol g?1, respectively. Our results suggest that, depending on the type of chemical modification, the chitin-glucan complexes can be used either for selective Cu2+ removal (CsG) or for total transition metal adsorption (CM-CG) from aqueous effluents

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8.
Инвентарный номер: нет.
   
   E 97

   
    Exchange Interactions in Cobalt(II) and Nickel(II) Complexes Containing M-4(mu(3)-OH)(2) Metal Cores with Distorted Rhombic Topology [Electronic resource] / A. Golberg, G. G. Aleksandrov, A. S. Bogomyakov, M. A. Kiskin, S. V. Kolotilov, I. A. Utepova, A. A. Sidorov, O. N. Chupakhin, I. L. Eremenko // Theoretical and Experimental Chemistry . - 2015. - Vol. 50, № 6. - С. 364-370. - Bibliogr. : p. 369-370 (21 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
PENTANUCLEAR COMPLEX -- COBALT(II) -- TETRANUCLEAR COMPLEX
Аннотация: Antiferromagnetic interactions between the Co2+ or Ni2+ ions were found in complexes [(mu(3) aEuroaEuro parts per thousand L)(2)Co (5) (II) (mu aEuroaEuro parts per thousand OH)(2)(Piv)(7)(NO3)] and [(mu(3) aEuroaEuro parts per thousand L)(2)(HPiv)Ni (4) (II) (mu(3) aEuroaEuro parts per thousand OH)(2)(Piv)(4)(NO3)(2)] (Piv(-) = pivalic acid anion, L = 1,1'-dipyridazinylferrocene) possessing a metal core with distorted rhombic topology M-4(mu(3)-OH)(2). In contrast to the case of symmetrical analogs, the signs of all the exchange interaction parameters J were determined unambiguously.

\\\\expert2\\nbo\\Theoretical and Experimental Chemistry\\2015, V.50, № 6, p.364-370.pdf
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9.
Инвентарный номер: нет.
   
   P 49

    Pestov, A. V.
    First example of the planar rectangular 18-nuclear nickel(II) hydroxo complex with n-(2-pyridylmethyl)iminodipropionic acid [Electronic resource] / A. V. Pestov, Yu. G. Yatluk, P. A. Slepukhin // Russian Journal of Coordination Chemistry. - 2011. - Vol. 37, № 8. - P619-624. - Bibliogr. : p. 624 (15 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: A planar rectangular cluster Ni(18) (I) was obtained from N-(2-pyridylmethyl)iminodipropionic acid (II). The crystal structure of complex I was determined by X-ray diffraction. Complex I is built from the octanuclear planar framework (III) of the nickel(II) hydroxo complex (Ni...Ni 2.976-3.092 ), four nickel chelates with the corresponding acid (IV), which are coplanar with the framework and are on both its sides (Ni...Ni, 2.938-3.188 ), four hydroxo complexes, and two mixed chloro chelates V), which are not coplanar with the framework (Ni...Ni, 3.141 and 3.181 ). In the chelate parts of complex I, the organic ligand is hexadentate because of bridging bonds; the coordination polyhedroLn of the metal center is a distorted square bipyramid (4 + 2)

\\\\Expert2\\nbo\\Russian Journal of Coordination Chemistry\\2011, v. 37, N. 8, p.619.pdf
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10.
Инвентарный номер: нет.
   
   H 43

   
    Heavy metals removal by flocculation/precipitation using N-(2-carboxyethyl)chitosans [Text] / S. YU. Bratskaya, A. V. Pestov, Yu. G. Yatluk, V. A. Avramenko // Colloids and Surfaces A: Physicochemical and Engineering Aspects. - 2009. - Vol. 339, № 1-3. - P140-144
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Here we report on solution properties and flocculation performance of polyampholyte chitosan derivatives - N-carboxyethylated chitosans (CEC) - synthesized "in gel" by treatment of chitosan with acrylic acid. We show that carboxyethylation with the substitution degrees (DS) from 0.7 to 1.6 yields water-soluble derivatives, whose isoelectric points (IEP) range from 6.30 to 3.55. At pH 7.5 interaction of negatively charged CEC derivatives with positively charged colloids of the heavy metal hydroxides (Zn2+, Cu2+, Ni2+), serving as a model of postgalvanic wastewaters, results in lowering of electrokinetic potential of the hydroxide colloids and their precipitation at appropriate flocculant dose. Investigations of CEC flocculation performance depending on pH and DS show that the efficiency of metal removal decreases in the row Cu2+ Zn2+ Ni2+ corresponding to the row of the hydroxocomplex stability for these metals. The higher was pH of the system and DS of CEC derivative, the narrower was the flocculation window and the stronger was negative effect of flocculant overdosing on the efficiency of heavy metal removal. Based on the estimation of floc settling rates and the residual metal concentrations, we have concluded that the optimal DS of CEC derivatives for the precipitation of metal hydroxides is 0.7-1.0

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