Gold(III) Chlorohydroxo Complexes in Aqueous Solutions at Increased Temperatures

I. V. Mironov; V. Yu Kharlamova

doi:10.1134/S0036023620030092

Gold(III) Chlorohydroxo Complexes in Aqueous Solutions at Increased Temperatures

I. V. Mironov, V. Yu Kharlamova

Кафедра аналитической химии ФЕН

Результат исследования: Научные публикации в периодических изданиях › статья › рецензирование

1 Цитирования (Scopus)

Аннотация

The stagewise substitution equilibria AuCl^- ₄ + iOH^– = AuCl_{4 –} _i OH_i ^- + iCl^–, β_i in aqueous solutions at 50 and 80°C (I = 1 mol/L NaCl) have been studied. The equilibrium constants log β₁ = 7.26, log β₂ = 13.98, log β₃ = 19.66, log β₄ = 24.78 (50°C); log β₁ = 6.89, log β₂ = 13.13, log β₃ = 18.43, and log β₄ = 23.30 (80°C) have been determined. They are lower than the same constants at 25°C. The spectra of complex speciesspecies at 80°C have been calculated, and the heterogeneous equilibrium 0.5Au₂O₃ xH₂O_S + OH^– = Au(OH)₄ ^- + 0.5xH₂O of the red Au₂O₃ · xH₂O_S species at 80°C has been studied, logK_S = 3.7 ± 0.2. The obtained results may be useful in geochemistry and the synthesis of gold nanoparticles.

Язык оригинала	английский
Страницы (с-по)	420-425
Число страниц	6
Журнал	Russian Journal of Inorganic Chemistry
Том	65
Номер выпуска	3
DOI	https://doi.org/10.1134/S0036023620030092
Состояние	Опубликовано - мар 2020

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10.1134/S0036023620030092

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@article{f21aeff95a424c818d0a846123a09a4f,

title = "Gold(III) Chlorohydroxo Complexes in Aqueous Solutions at Increased Temperatures",

abstract = "The stagewise substitution equilibria AuCl- 4 + iOH– = AuCl4 – i OHi - + iCl–, βi in aqueous solutions at 50 and 80°C (I = 1 mol/L NaCl) have been studied. The equilibrium constants log β1 = 7.26, log β2 = 13.98, log β3 = 19.66, log β4 = 24.78 (50°C); log β1 = 6.89, log β2 = 13.13, log β3 = 18.43, and log β4 = 23.30 (80°C) have been determined. They are lower than the same constants at 25°C. The spectra of complex speciesspecies at 80°C have been calculated, and the heterogeneous equilibrium 0.5Au2O3 xH2OS + OH– = Au(OH)4 - + 0.5xH2O of the red Au2O3 · xH2OS species at 80°C has been studied, logKS = 3.7 ± 0.2. The obtained results may be useful in geochemistry and the synthesis of gold nanoparticles.",

keywords = "equilibria in solution, gold(III) complexes, increased temperatures, stability constants, substitution of ligands, GOLD NANOPARTICLES, REDUCTION, MECHANISM, SPECIATION, CITRATE, SIZE, PH",

author = "Mironov, {I. V.} and Kharlamova, {V. Yu}",

year = "2020",

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Gold(III) Chlorohydroxo Complexes in Aqueous Solutions at Increased Temperatures. / Mironov, I. V.; Kharlamova, V. Yu.

В: Russian Journal of Inorganic Chemistry, Том 65, № 3, 03.2020, стр. 420-425.

Результат исследования: Научные публикации в периодических изданиях › статья › рецензирование

TY - JOUR

T1 - Gold(III) Chlorohydroxo Complexes in Aqueous Solutions at Increased Temperatures

AU - Mironov, I. V.

AU - Kharlamova, V. Yu

PY - 2020/3

Y1 - 2020/3

N2 - The stagewise substitution equilibria AuCl- 4 + iOH– = AuCl4 – i OHi - + iCl–, βi in aqueous solutions at 50 and 80°C (I = 1 mol/L NaCl) have been studied. The equilibrium constants log β1 = 7.26, log β2 = 13.98, log β3 = 19.66, log β4 = 24.78 (50°C); log β1 = 6.89, log β2 = 13.13, log β3 = 18.43, and log β4 = 23.30 (80°C) have been determined. They are lower than the same constants at 25°C. The spectra of complex speciesspecies at 80°C have been calculated, and the heterogeneous equilibrium 0.5Au2O3 xH2OS + OH– = Au(OH)4 - + 0.5xH2O of the red Au2O3 · xH2OS species at 80°C has been studied, logKS = 3.7 ± 0.2. The obtained results may be useful in geochemistry and the synthesis of gold nanoparticles.

AB - The stagewise substitution equilibria AuCl- 4 + iOH– = AuCl4 – i OHi - + iCl–, βi in aqueous solutions at 50 and 80°C (I = 1 mol/L NaCl) have been studied. The equilibrium constants log β1 = 7.26, log β2 = 13.98, log β3 = 19.66, log β4 = 24.78 (50°C); log β1 = 6.89, log β2 = 13.13, log β3 = 18.43, and log β4 = 23.30 (80°C) have been determined. They are lower than the same constants at 25°C. The spectra of complex speciesspecies at 80°C have been calculated, and the heterogeneous equilibrium 0.5Au2O3 xH2OS + OH– = Au(OH)4 - + 0.5xH2O of the red Au2O3 · xH2OS species at 80°C has been studied, logKS = 3.7 ± 0.2. The obtained results may be useful in geochemistry and the synthesis of gold nanoparticles.

KW - equilibria in solution

KW - gold(III) complexes

KW - increased temperatures

KW - stability constants

KW - substitution of ligands

KW - GOLD NANOPARTICLES

KW - REDUCTION

KW - MECHANISM

KW - SPECIATION

KW - CITRATE

KW - SIZE

KW - PH

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