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Общее количество найденных документов : 25
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 1-10    11-20   21-25 
1.
Инвентарный номер: нет.
   


   
    2,2 '-Bipyridinyl carboranes as B,N,N-ligands in cyclometallated complexes of platinum(II) [] / A. M. Prokhorov, P. A. Slepukhin, V. L. Rusinov, V. N. Kalinin, D. N. Kozhevnikov // Chemical Communications. - 2011. - Vol. 47, № 27. - С. 7713-7715
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
O-CARBORANE -- METALLACARBORANES -- PHOTOLUMINESCENT
Аннотация: Novel B,N,N-cyclometallated Pt(II) complexes of 2,2'-bipyridin-6-yl carboranes exhibit absorption and emission similar to relative Pt(II) complexes of aromatic C,N,N-ligands: the same transitions but lower intensities. DFT calculations suggest the former emits from the (3)MLCT state while for the latter the mixed (3)ICT-MLCT transitions should be considered

\\\\expert2\\NBO\\Chemical Communications\\2011,v.47. p.7713.pdf
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2.
Инвентарный номер: нет.
   
   C 98


   
    Cyclometallated Pt-II complexes of 2-(2-thienyl)-4-(cycloalkylimino)-substituted quinazolines [Electronic resource] / E. V. Nosova, T. N. Moshkina, D. S. Kopchuk, G. N. Lipunova, P. A. Slepukhin, V. N. Charushin // Mendeleev Communications. - 2016. - Vol. 26, № 2. - С. 129-130
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
PLATINUM COMPLEXES -- DIODES
Аннотация: The title complexes were prepared based on 2-(thiophen-2-yl)-4-(morpholin-4-yl)- and 2-(thiophen-2-yl)-4-(piperidin-1-yl)-substituted quinazolines and found to exhibit luminescent properties

\\\\expert2\\NBO\\Mendeleev Communications\\2016, v.26, p. 129-130.pdf
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3.
Инвентарный номер: нет.
   
   F 94


   
    From 1,2,4-triazines towards Substituted pyridines and their cyclometalled Pt complexes [Electronic resource] / V. N. Kozhevnikov, M. M. Ustinova, P. A. Slepukhin, D. N. Kozhevnikov, Amedeo Santoro, W. Dunkan // Tetrahedron Letters. - 2008. - Vol. 49, № 26. - P4096-4098 : рис. - Библиогр. : с. 4098 (28 назв.) . - ISSN 0040-4039
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: A new, efficient methodology for the synthesis of substituted thienylpyridines includes the synthesis of 3-thienyl-1,2,4-triazines using simple heterocyclisation followed by easy transformation of the triazine ring to a pyridine through an aza Diels–Alder approach. A variety of substituted pyridines can be easily achieved using cheap, commercially available reagents such as bromoacetylarenes, aroyl hydrazides, norbornadiene, and enamines in various combinations. New thienylpyridines form phosphorescent cyclometallated Pt complexes.??

\\\\Expert2\\nbo\\Tetrahedron Letters\\2008, v. 49, p.4096.pdf
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4.
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   S 49


    Serebryakov, N. S.
    High-grade calcium-sodium metasomatism and corundum formation in the Precambrian Belomorian Mobile Belt, Karelia [Text] / N. S. Serebryakov, V. L. Rusinov // Doklady Earth Sciences. - 2004. - Vol. 395, № 3. - P389-393. - Bibliogr. : p. 393 (14 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
calcium -- corundum -- metamorphism -- metasomatism -- mobile belt -- Precambrian -- sodium
Аннотация: Study of the Khitoostrov, Varatsk, and other corundum occurrences in kyanite-garnet-biotite plagiogneisses of the Chupa section (Belomorian Mobile Belt) has revealed their association with products of low-alkaline Ca-Na metasomatism characterized by high PT conditions. Similar corundum-bearing rocks, which were also presumably formed during subalkaline metasomatism, are known in Tanzania, India, the United States, and other countries. This paper presents the first results of analysis of the corundum-forming Ca-Na metasomatism.

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5.
Инвентарный номер: нет.
   
   I-60


   
    Influence of the structure of the aminoalkyl group in polysiloxane on the selectivity of its interaction with metal ions / A. S. Kholmogorova, E. A. Fedoseeva, L. K. Neudachina [et al.] // Russian Journal of Applied Chemistry. - 2021. - Vol. 94, № 4. - P478-485
ББК Г
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Polysiloxanes containing nonchelating 3-aminopropyl and chelating N-(2-aminoethyl)-3-aminopropyl groups with the degree of functionalization of 28 and 24%, respectively, were prepared by sol–gel synthesis. The polysiloxanes obtained showed comparable activity in sorption of Pd(II), Pt(IV), Fe(III), Cd(II), Zn(II), Co(II), Ni(II), Cu(II), Mn(II), Pb(II), Ca(II), and Mg(II) ions from model multicomponent solutions. At pH 3,3-aminopropylpolysiloxane selectively takes up platinoid ions. The chelating structure of N-(2-aminoethyl)-3-aminopropyl groups leads to a decrease in the selectivity of the interaction with Pd(II) ions but increases the affinity for Fe(III), Ni(II), and Cu(II). Preconcentration in the dynamic mode allows quantitative sorption of Pd(II) and Pt(IV), followed by virtually quantitative elution of the metal ions from the sorbent surface.

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6.
Инвентарный номер: нет.
   
   N 10


   
    N-(2-(2-Pyridyl)ethyl)chitosan (PEC) for Pd(II) and Pt(IV) sorption from HCl solutions / L. A. Santos Sorena, M. Ruiz, A. V. Pestov, A. M. Sastre, Yu. G. Yatluk, E. Guibal // Cellulose. - 2011. - Vol. 18, № 2. - С. 309-325
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
CHITOSAN – PYRIDYL GROUPS -- PALLADIUM -- PLATINUM
Аннотация: Chitosan was modified by grafting 2-pyridyl-ethyl moieties on the biopolymer backbone for the synthesis of a Platinum Group Metal (PGM) sorbent. The sorbent was tested for Pd(II) and Pt(IV) sorption from HCl solutions. Stable for HCl concentrations below 0.5 M, the sorbent reached sorption capacities as high as 3.2 and 2.6 mmol metal g?1 for Pd(II) and Pt(IV), respectively. Metal sorption mainly proceeds by electrostatic attraction in acidic solutions, though a contribution of complexation mechanism cannot be totally rejected. The resistance to intraparticle diffusion is the main controlling mechanism for uptake kinetics. While agitation speed has a limited effect on kinetics, metal concentration and sorbent dosage have a greater effect on the kinetic profiles. The intraparticle diffusivity varies between 3 ? 10?11 and 4.5 10?10 m2 min?1. Thiourea (combined with HCl solution) is used for Pd(II) and Pt(IV) desorption. The resin could be desorbed and recycled for a minimum of five cycles maintaining high efficiencies of sorption and desorption. ??

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7.
Инвентарный номер: нет.
   
   N 10


   
    N-(2-(2-Pyridyl)ethyl)chitosan (PEC) for Pd(II) and Pt(IV) sorption from HCl solutions [Text] / L. A. Santos Sorena, M. Ruiz, A. V. Pestov, A. M. Sastre, Yu. G. Yatluk, E. Guibal // Cellulose. - 2011. - Vol. 18, № 2. - P309-325. - Bibliogr. : p. 324-325 (32 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Chitosan was modified by grafting 2-pyridyl-ethyl moieties on the biopolymer backbone for the synthesis of a Platinum Group Metal (PGM) sorbent. The sorbent was tested for Pd(II) and Pt(IV) sorption from HCl solutions. Stable for HCl concentrations below 0.5 M, the sorbent reached sorption capacities as high as 3.2 and 2.6 mmol metal g?1 for Pd(II) and Pt(IV), respectively. Metal sorption mainly proceeds by electrostatic attraction in acidic solutions, though a contribution of complexation mechanism cannot be totally rejected. The resistance to intraparticle diffusion is the main controlling mechanism for uptake kinetics. While agitation speed has a limited effect on kinetics, metal concentration and sorbent dosage have a greater effect on the kinetic profiles. The intraparticle diffusivity varies between 3 ? 10?11 and 4.5 ? 10?10 m2 min?1. Thiourea (combined with HCl solution) is used for Pd(II) and Pt(IV) desorption. The resin could be desorbed and recycled for a minimum of five cycles maintaining high efficiencies of sorption and desorption

\\\\Expert2\\nbo\\Cellulose\\2011, v.18, p. 309.pdf
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8.
Инвентарный номер: нет.
   
   N 10


   
    N-(2-(2-Pyridyl)ethyl)chitosan (PEC) for Pd(II) and Pt(IV) sorption from HCl solutions [] / L. A. Santos Sorena, M. Ruiz, A. V. Pestov, A. M. Sastre, Yu. G. Yatluk, E. Guibal // Cellulose. - 2010. - 6 December. - Online first : рис., табл.
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Chitosan was modified by grafting 2-pyridyl-ethyl moieties on the biopolymer backbone for the synthesis of a Platinum Group Metal (PGM) sorbent. The sorbent was tested for Pd(II) and Pt(IV) sorption from HCl solutions. Stable for HCl concentrations below 0.5 M, the sorbent reached sorption capacities as high as 3.2 and 2.6 mmol metal g1 for Pd(II) and Pt(IV), respectively. Metal sorption mainly proceeds by electrostatic attraction in acidic solutions, though a contribution of complexation mechanism cannot be totally rejected. The resistance to intraparticle diffusion is the main controlling mechanism for uptake kinetics. While agitation speed has a limited effect on kinetics, metal concentration and sorbent dosage have a greater effect on the kinetic profiles. The intraparticle diffusivity varies between 3 10?11 and 4.5 1010 m2 min1. Thiourea (combined with HCl solution) is used for Pd(II) and Pt(IV) desorption. The resin could be desorbed and recycled for a minimum of five cycles maintaining high efficiencies of sorption and desorption

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9.
Инвентарный номер: нет.
   
   N 10


   
    N-(2-(2-pyridyl)ethyl)chitosan: Synthesis, characterization and sorption properties / S. YU. Bratskaya, Yu. A. Azarova, E. G. Matochkina, M. I. Kodess, Yu. G. Yatluk, A. V. Pestov // Carbohydrate Polymers. - 2012. - Vol. 87, № 1. - С. 869-875
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
CHITOSAN N-HETEROCYCLIC DERIVATIVES -- SELECTIVE ADSORPTION -- PYRIDINE DERIVATIVES
Аннотация: The method of producing N-2-(2-pyridyl)ethylchitosan (PE-chitosan) with substitution degrees (DS) up to 1.2 has been developed using the "synthesis in gel" approach for direct addition reaction between 2-vynilpyridine and chitosan. Investigation of sorption properties has revealed significantly higher affinity of pyridylethyl fragments to Pt(IV)) and Pd(II) ions compared to the unsubstituted amino groups of chitosan. The maximum sorption capacities of PE-chitosan in 0.1 M HCl solution were estimated as 5.56 mmol/g for Au(III), 3.67 mmol/g for Pd(II), and 2.75 mmol/g for Pt(IV). Sorption capacities of PE-chitosan for transition metal ions at pH 4-8 were 1.5-2.6 higher than those of chitosan with the highest values attained for Cu(II) and Ag(I) ions - 1.50 mmol/g and 1.53 mmol/g, respectively. The PE-chitosan application for preconcentration of Au(III) with subsequent elution with HCl/thiourea mixtures was proved to be efficient for atomic absorption spectroscopy analysis of multi-component solutions with low gold content

\\\\Expert2\\nbo\\Carbohydrate Polymers\\2012, v. 87, p.869.pdf
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10.
Инвентарный номер: нет.
   
   N 10


   
    N-(2-(2-pyridyl)ethyl)chitosan: synthesis, characterization and sorption properties [Text] / S. YU. Bratskaya, Yu. A. Azarova, E. G. Matochkina, M. I. Kodess, Yu. G. Yatluk, A. V. Pestov // Carbohydrate Polymers. - 2011. - In Press, Accepted Manuscript, Availabe online 31 Augist 2011
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The method of producing N-2-(2-pyridyl)ethylchitosan (PE-chitosan) with substitution degrees (DS) up to 1.2 has been developed using the “synthesis in gel” approach for direct addition reaction between 2-vynilpyridine and chitosan. Investigation of sorption properties has revealed significantly higher affinity of pyridylethyl fragments to Pt(IV)) and Pd(II) ions compared to the unsubstituted amino groups of chitosan. The maximum sorption capacities of PE-chitosan in 0.1 M HCl solution were estimated as 5.56 mmol/g for Au(III), 3.67 mmol/g for Pd(II), and 2.75 mmol/g for Pt(IV). Sorption capacities of PE-chitosan for transition metal ions at pH 4-8 were 1.5-2.6 higher than those of chitosan with the highest values attained for Cu(II) and Ag(I) ions–1.50 mmol/g and 1.53 mmol/g, respectively. The PE-chitosan application for preconcentration of Au(III) with subsequent elution with HCl/thiourea mixtures was proved to be efficient for atomic absorption spectroscopy analysis of multi-component solutions with low gold content

\\\\Expert2\\nbo\\Carbohydrate Polymers\\2011, Article inPress, 31 August.pdf
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