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Общее количество найденных документов : 17
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1.

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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2.

Вид документа :
Шифр издания : 54/T 44
Автор(ы) : Neudachina L.K., Golub A. Y., Gorbunova E. M., Yatluk Yu. G.
Заглавие : Thermal stability of new sorption materials based on polysiloxanes
Место публикации : Glass Physics and Chemistry. - 2011. - Vol.37, №6. - С. 603-612
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): thermal stability --thiocarbamoylated polysiloxanes --siloxane matrix
Аннотация: The thermal stability of the unmodified, aminated, and thiocarbamoylated polysiloxanes has been studied. The siloxane matrix is stable in the temperature range up to 800°C. For the first time, mass spectrometry has been applied to the analysis of the composition of the gaseous products of thermal decomposition of the studied polysiloxanes. It has been shown that, in the process of thermal decomposition, the terminal functional groups are detached and oxidized. Water, ammonia, nitrogen, carbon, and sulfur (in the case of thiourea-modified sorbent) oxides are formed predominantly. The quantitative removal of functional groups during heating up to 800°C has been confirmed by IR spectroscopy. A mechanism of thermal decomposition of polysiloxane xerogels has been proposed. It has been found that adsorption of platinum increases the thermal stability of the samples
\\\\Expert2\\nbo\\Glass Physics and Chemistry\\2011, V. 37, N 6, P.603-612.pdf
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3.

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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4.

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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5.

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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6.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kopchuk D. S., Slepukhin P. A., Taniya O. S., Krinochkin A. P., Zyryanov G. V., Chupakhin O. N.
Заглавие : Platinum(II) acetylacetonate complex based on 5-(3-aminophenyl)-2-(2-thienyl)pyridine: synthesis, crystal structure, and photophysical properties
Место публикации : Russian Journal of Coordination Chemistry. - 2022. - Vol. 48, № 7. - С. 430-435
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The Pt(II) acetylacetonate complex [(L)Pt(Acac)] based on aminophenyl-substituted 2-(2-thienyl)pyridine (L) was synthesized, its photophysical properties were studied and compared with these properties for a similar complex containing no amino group in the ligand. The structure of the complex was confirmed by X-ray diffraction (CIF file CCDC no. 2144689), 1H and 13C NMR spectroscopy, ESI mass spectrometry, and elemental analysis.
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7.

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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8.

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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9.

Вид документа : Статья из журнала
Шифр издания : 54/T 45
Автор(ы) : Bratskaya S.YU., Ustinov A. Yu., Azarova Yu. A., Pestov A. V.
Заглавие : Thiocarbamoyl chitosan: Synthesis, characterization and sorption of Au(III), Pt(IV), and Pd(II)
Место публикации : Carbohydrate Polymers. - 2011. - Vol. 85, № 4. - С. 854-861: ил.
Примечания : Bibliogr. : p. 860-861 (39 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Here we suggest a new method of chitosan sulfur derivatives (thiocarbamoylchitosans, TC-chitosans) synthesis via reaction in eutectic two-component system ammonium rodanide–thiourea that allows significant increase of substitution degrees at the reduced time and reagent consumption as compared to conventional synthetic procedures. The sorption properties of TC-chitosans with substitution degrees (DS) from 0.4 to 0.9 toward Au(III), Pt(IV), Pd(II) ions were studied in chloride solutions, including systems with 10 to 1000-fold excess of Fe(III), Cu(II), and Zn(II) over the precious metal ions content. The sorption capacities of TC-chitosans increase with DS and change in the row: Au(III) Pd(II) Pt(IV) ? Cu(II) Fe(III) Zn(II). The maximum sorption capacities of TC-chitosan with DS 0.9 for Pt(IV), Pd(II), and Au(III) were 1.24 mmol/g, 3.43 mmol/g, and 3.81 mmol/g, respectively. Characterization of precious metals oxidation states by the XPS method after the sorption on TC-chitosan revealed that the platinum and gold recovery occurred with reduction of Au(III) to Au(I)/Au(0) and Pt(IV) to Pt(II)????
\\\\Expert2\\nbo\\Carbohydrate Polymers\\2011, v. 85, p.854.pdf
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания : 54/Т 42
Автор(ы) : Пестов А. В., Братская С.Ю., Слободюк А.Б., Авраменко В.А., Ятлук Ю. Г.
Заглавие : Тиокарбамоилхитозан - селективный сорбент ионов платины (II) и палладия(II) : доклад, тезисы доклада
Параллельн. заглавия :Thiocarbamoylchitosan - selective sorbent of ions of platinum (IV) and palladium
Место публикации : Современные перспективы в исследовании хитина и хитозана : материалы IX Международной конф., Ставрополь, 13-17 окт. 2008 г. : докл. - Ставрополь, 2008. - С. 85-87
Примечания : Библиогр.: с. 87 (6 назв.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
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