Gold(III) amine complexes in aqueous alkali solutions

Миронов, И. В.; Afanas’eva, V. A.

doi:10.1134/s0036023610070302

Cited by 7 publications

(3 citation statements)

References 9 publications

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“…This species showed two broad bands at ∼320 and ∼400 nm in the UV-visible spectrum which agrees well with that reported in the literature. 29 Once TMAB was added, the color of the solution turned pale yellow indicating the reduction of Au(III) to Au(I) 30,31 and the UV-visible spectrum was featureless. Attempts to isolate and characterize the pale yellow product were unsuccessful due to the presence of TMAB which reduces Au(I) to its elemental form in the solid state also.…”

Section: Monometallic Nanoparticlesmentioning

confidence: 99%

Bimetallic core–shell nanocomposites using weak reducing agent and their transformation to alloy nanostructures

2013

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An in situ seeding growth methodology towards the preparation of core-shell nanoparticles composed of noble metals has been developed by employing trimethylamine borane (TMAB) as the reducing agent. Being a weak reducing agent, TMAB is able to distinguish the smallest reduction potential window of any two metals which renders selective reduction of metal ions thus affording a core-shell architecture of the nanoparticles. A dramatic effect of solvent was noted during the reduction of Ag(+) ions: an immediate reduction took place at room temperature when dry THF was used as solvent however, usage of wet THF (THF used directly from the bottle) brings out the reduction only at reflux conditions. In the case of Au and Pd nanoparticles, preparation was found to be independent of the quality of solvent used. Au nanoparticles are realized at room temperature whereas reflux conditions are required in the case of Pd nanoparticles. This difference in behavior of the monometallic nanoparticles was successfully exploited to construct different noble metal nanoparticles with core-shell architectures such as Au@Ag, Ag@Au, and Ag@Pd. Transformation of these core-shell nanoparticles to their thermodynamically stable alloy counterparts is also demonstrated under very mild conditions reported to date.

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Section: Monometallic Nanoparticlesmentioning

confidence: 99%

Bimetallic core–shell nanocomposites using weak reducing agent and their transformation to alloy nanostructures

2013

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“…This can be attributed to the higher specific surface area of FeOOH, which allowed for increased gold species adsorption and a higher gold loading. In alkaline aqueous solutions, gold species exist as soluble complex anions instead of Au(OH) 3 precipitant [22]. The actual reaction occurring during synthesis could be the adsorption of complex anions onto the support by reaction with surface hydroxyl groups; therefore, the adsorption capacity of the support was critical for the loading of gold.…”

Section: Resultsmentioning

confidence: 99%

Adsorption Synthesis of Iron Oxide-Supported Gold Catalyst under Self-Generated Alkaline Conditions for Efficient Elimination of Carbon Monoxide

Pan

Zhang

et al. 2018

Catalysts

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Goethite- and hematite-supported highly dispersed gold catalysts for carbon monoxide oxidation were synthesized by gold precursor adsorption onto the support materials in self-generated alkaline solutions. The support materials were prepared by reacting iron nitrate with excess sodium hydroxide. The residual minor alkali incorporated into the support could provide suitable alkaline conditions at approximately pH 8 for the hydrolysis of tetrachloroaurate anions and the subsequent adsorption process. Gold species underwent autoreduction to achieve activation during the synthesis. An increase in pH or temperature to 80 °C decreased the gold loading of the catalysts. The optimal catalysts could achieve complete oxidation of carbon monoxide at −20 °C.

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“…The constants of Processes ( 1)-( 3) are adopted from [47] 4)-( 7) are taken from the paper [48] (log β (4) = 7.87; log β (5) = 14.79; log β (6) = 20.92; log β (7) = 25.98). The value of log β (8) = 13.91 was taken from the report [49].…”

Section: Stability Of Gold(iii) Complexes With Hydrazonesmentioning

confidence: 99%

Complexes of Gold(III) with Hydrazones Derived from Pyridoxal: Stability, Structure, and Nature of UV-Vis Spectra

Kuranova,

Pimenov,

Zavalishin

et al. 2024

IJMS

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Pyridoxal and pyridoxal 5′-phosphate are aldehyde forms of B6 vitamin that can easily be transformed into each other in the living organism. The presence of a phosphate group, however, provides the related compounds (e.g., hydrazones) with better solubility in water. In addition, the phosphate group may sometimes act as a binding center for metal ions. In particular, a phosphate group can be a strong ligand for a gold(III) ion, which is of interest for researchers for the anti-tumor and antimicrobial potential of gold(III). This paper aims to answer whether the phosphate group is involved in the complex formation between gold(III) and hydrazones derived from pyridoxal 5′-phosphate. The answer is negative, since the comparison of the stability constants determined for the gold(III) complexes with pyridoxal- and pyridoxal 5′-phosphate-derived hydrazones showed a negligible difference. In addition, quantum chemical calculations confirmed that the preferential coordination of two series of phosphorylated and non-phosphorylated hydrazones to gold(III) ion is similar. The preferential protonation modes for the gold(III) complexes were also determined using experimental and calculated data.

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Gold(III) amine complexes in aqueous alkali solutions

Cited by 7 publications

References 9 publications

Bimetallic core–shell nanocomposites using weak reducing agent and their transformation to alloy nanostructures

Bimetallic core–shell nanocomposites using weak reducing agent and their transformation to alloy nanostructures

Adsorption Synthesis of Iron Oxide-Supported Gold Catalyst under Self-Generated Alkaline Conditions for Efficient Elimination of Carbon Monoxide

Complexes of Gold(III) with Hydrazones Derived from Pyridoxal: Stability, Structure, and Nature of UV-Vis Spectra

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