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Общее количество найденных документов : 17
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 1-10    11-17 
1.

Вид документа : Статья из журнала
Шифр издания : 54
Автор(ы) : Prokhorov A. M., Slepukhin P. A., Rusinov V. L., Kalinin V. N., Kozhevnikov D. N.
Заглавие : 2,2 '-Bipyridinyl carboranes as B,N,N-ligands in cyclometallated complexes of platinum(II) [Электронный ресурс]
Место публикации : Chemical Communications. - 2011. - Vol. 47, № 27. - С. 7713-7715
Систем. требования: http://www.springerlink.com/journals/
Примечания : Электрон. версия печ. публикации
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
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.

Вид документа : Статья из журнала
Шифр издания : 54/C 98
Автор(ы) : Nosova E. V., Moshkina T. N., Kopchuk D. S., Lipunova G. N., Slepukhin P. A., Charushin V. N.
Заглавие : Cyclometallated Pt-II complexes of 2-(2-thienyl)-4-(cycloalkylimino)-substituted quinazolines [Электронный ресурс]
Место публикации : Mendeleev Communications. - 2016. - Vol. 26, № 2. - С. 129-130
Систем. требования: http://apps.webofknowledge.com/full
Примечания : 26.10.16
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 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.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kapitanova E. I., Sinelshchikova A. R., Petrova Yu. S., Zemlyakova E. O., Pestov A. V., Neudachina L.K.
Заглавие : Effect of the degree of sulfoethylation of polyethylenimine on the selectivity of sorption of palladium(II) from binary solutions
Место публикации : Russian chemical bulletin. - 2021. - Vol. 70, № 6. - С. 1161-1166
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): polyethylenimine--sulfoethylation--sorption--platinum(iv)--palladium(ii)--gold(iii)
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4.

Вид документа : Статья из журнала
Шифр издания : Г/F 33
Автор(ы) : Alifkhanova L. M., Lopunova K. Y., Marchuk A. A., Petrova Y. S., Pestov A. V., Neudachina L. K.
Заглавие : Features of sorption preconcentration of noble metal ions with sulfoethylated amino polymers
Место публикации : Russian journal of inorganic chemistry. - 2021. - Vol. 66, № 6. - С. 909-915
ББК : Г
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Dependencies for the sorption of palladium(II), gold(III), and platinum(IV) chloro complexes from individual and binary solutions with sorbents based on sulfoethylated polyallylamine and poly(aminostyrene) have been obtained. It has been found that predominant sorption mechanism is complexation with functional groups of the sorbents for gold(III) and palladium(II) and ion exchange for platinum(IV). It has been shown that increase in the sulfoethylation degree of aminopolymer matrix leads to decrease of platinum(IV) sorption and therefore, to increase in palladium(II) sorption selectivity relative to this ion. This effect is the largest for the sorbents based on polyallylamine. The conditions of quantitative desorption of the studied metals from sorbent surface have been determined. The sorption of gold(III) by the sorbent based on polyallylamine has been shown to be complicated by gold(III) reduction in sorbent phase.
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5.

Вид документа : Статья из журнала
Шифр издания : 54/N 10
Автор(ы) : Santos Sorena L. A., Ruiz M., Pestov A. V., Sastre A. M., Yatluk Yu. G., Guibal E.
Заглавие : N-(2-(2-Pyridyl)ethyl)chitosan (PEC) for Pd(II) and Pt(IV) sorption from HCl solutions
Место публикации : Cellulose. - 2011. - Vol. 18, № 2. - С. 309-325
Примечания : Bibliogr. : p. 324-325 (32 ref.)
ББК : 54
Предметные 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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6.

Вид документа : Статья из журнала
Шифр издания : 54/N 10
Автор(ы) : Santos Sorena L. A., Ruiz M., Pestov A. V., Sastre A. M., Yatluk Yu. G., Guibal E.
Заглавие : N-(2-(2-Pyridyl)ethyl)chitosan (PEC) for Pd(II) and Pt(IV) sorption from HCl solutions
Место публикации : Cellulose. - 2011. - Vol. 18, № 2. - С. 309-325
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 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.

Вид документа : Статья из журнала
Шифр издания : 54/N 10
Автор(ы) : Santos Sorena L. A., Ruiz M., Pestov A. V., Sastre A. M., Yatluk Yu. G., Guibal E.
Заглавие : N-(2-(2-Pyridyl)ethyl)chitosan (PEC) for Pd(II) and Pt(IV) sorption from HCl solutions
Место публикации : Cellulose. - 2010. - 6 December. - С. Online first: рис., табл.
ББК : 54
Предметные 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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8.

Вид документа : Статья из журнала
Шифр издания : 54/P 17
Автор(ы) : Butewicz A., Campos Galivan K., Pestov A. V., Yatluk Yu. G., Trochimczuk A. W., Guibal E.
Заглавие : Palladium and platinum sorption on a thiocarbamoyl-derivative of chitosan
Место публикации : Journal of Applied Polymer Science . - 2010. - Vol. 116, № 6. - С. 3318-3330: рис.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Immobilizing thiourea onto chitosan allowed using the polymer for the recovery of platinum groups metals (PGMs) in acidic solutions (up to 1–2M HCl concentrations). At low HCl concentration protonated amine groups may sorb chloroanionic metal species (electrostatic attraction mechanism); however, most of sorption proceeds through chelation on sulfur containing groups (less sensitive to acidic conditions). The bi-site Langmuir equation was used for fitting sorption isotherms. The sorption of PGMs was weakly affected by the composition of the solution (presence of high concentration of anions and base metals). Maximum sorption capacities for Pd(II) and Pt(IV) ranged between 274 and 330 mg g?1 in 0.25M HCl solutions and decreased to 150–198 mg g?1 in 2M HCl solutions: Pd(II) sorption was systematically higher than Pt(IV) sorption. The pseudo-second rate equation was used for modeling the uptake kinetics. Agitation speed hardly affected uptake kinetics indicating that external diffusion resistance is not the rate controlling step. Desorption yield higher than 85% were obtained using thiourea in 0.1M HCl solution. The adsorbents could be reused for at least three cycles
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9.

Вид документа : Статья из журнала
Шифр издания : 54/P 51
Автор(ы) : Marakushev A. A., Paneyakh N. A., Rusinov V. L., Pertsev N. N., Zotov I. A.
Заглавие : Petrological model of formation of giant ore deposits
Место публикации : Geology of Ore Deposits. - 1998. - Vol. 40, № 3. - С. 211-227
Примечания : Bibliogr. : p. 227 (46 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The available data on the giant ore deposits of chromium (Kempirsai in the Urals), platinum-group metals (Bushveld in Africa), platinum-bearing copper-nickel ores (Talnakh in the Noril'sk district, northern part of the Siberian Platform), zinc-copper (massive sulfide) ores (Gai, Sibai, and Uchaly) and apatite deposits (Khibiny, the Kola Peninsula) is summarized. The giant sizes of the deposits are caused by extraordinary ore-forming processes directly associated with the highly extensive petrogenetic processes. These processes resulted in the formation of peculiar dunites in the hyperbasite complexes (chromite ores), agpaitic urtites in alkaline associations (apatite deposits), development of low-sulfide horizons and hortonolite dunites in the basite-hyperbasite layered intrusions (platinum-group metal deposits), specific processes of transmagmatic sulfurization of the iron-rich igneous differentiates (Cu-Ni sulfide and massif sulfide ores), and processes of magmatic replacement of hyperbasites that cause the alkaline agpaitic affinity of magmatism. This agpaitic tendency increases the solubility of carbon-bearing fluid components (CO2, CH4, etc.) in magma and leads to the concentration of ore metals, which form chloride-carbonate and hydrocarbon migrating compounds in the transmagmatic fluids. Some mineralogical-petrological prospecting criteria are deduced on the basis of genetic models of giant ore deposits.
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10.

Вид документа : Статья из журнала
Шифр издания : 54/P 58
Автор(ы) : Kozhevnikov D. N., Kozhevnikov V. N., Shafikov M. Z., Prokhorov A. M., Bruce D.W., J. A. Gareth Williams
Заглавие : Phosphorescence vs Fluorescence in Cyclometalated Platinum(II) and Iridium(III) Complexes of (Oligo)thienylpyridines
Место публикации : Inorganic Chemistry . - 2011. - Vol. 50, № 8. - С. 3804-3815
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): oligothienylpyridines--ligands--luminescence properties
Аннотация: Two newly prepared oligothienylpyridines, 5-(2-pyridyl)-5?-dodecyl-2,2?-bithiophene, HL2, and 5-(2-pyridyl)-5??-dodecyl-2,2?:5?,2??-ter-thiophene, HL3, bind to platinum(II) and iridium(III) as NC-coordinating ligands, cyclometallating at position C4 in the thiophene ring adjacent to the pyridine, leaving a chain of either one or two pendent thiophenes. The synthesis of complexes of the form [PtLn(acac)] and [Ir(Ln)2(acac)] (n = 2 or 3) is described. The absorption and luminescence properties of these four new complexes are compared with the behavior of the known complexes [PtL1(acac)] and [Ir(L1)2(acac)] {HL1 = 2-(2-thienyl)pyridine}, and the profound differences in behavior are interpreted with the aid of time-dependent density functional theory (TD-DFT) calculations. Whereas [PtL1(acac)] displays solely intense phosphorescence from a triplet state of mixed ??*/MLCT character, the phosphorescence of [PtL2(acac)] and [PtL3(acac)] is weak, strongly red shifted, and accompanied by higher-energy fluorescence. TD-DFT reveals that this difference is probably due to the metal character in the lowest-energy excited states being strongly attenuated upon introduction of the additional thienyl rings, such that the spin?orbit coupling effect of the metal in promoting intersystem crossing is reduced. A similar pattern of behavior is observed for the iridium complexes, except that the changeover to dual emission is delayed to the terthiophene complex [Ir(L3)2(acac)], reflecting the higher degree of metal character in the frontier orbitals of the iridium complexes than their platinum counterparts.??
\\\\Expert2\\nbo\\Inorganic Chemistry\\2011, v.50, p.3804.pdf
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