The sulphito complexes of gold

Hydes, P. C.; Middleton, Harry

doi:10.1007/bf03215106

Cited by 20 publications

(4 citation statements)

References 19 publications

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“…The formation of the tricoordinated Au͑S 2 O 3 ͒͑SO 3 ͒ 2 5− species is also somewhat unexpected given the general tendency of Au͑I͒ to form linear complexes, 36 however analogous Au͑I͒ complexes such as Au͑SO 3 ͒ 2 ͑NO 2 ͒ 4− have been prepared and characterized. 37…”

Section: Input Data For Speciation Modelmentioning

confidence: 99%

Speciation Analysis of Au(I) Electroplating Baths Containing Sulfite and Thiosulfate

Green¹,

Roy

2006

J. Electrochem. Soc.

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An analysis of the speciation of gold plating solutions containing sulfite and thiosulfate as complexing agents has been performed. In the case of gold sulfite baths, it was found that the observed stability and electrochemical behavior were inconsistent with the commonly assumed stability constants of ␤ = 10 10 for the Au͑SO 3 ͒ 2 3− species. The data are, however, consistent with a much larger stability constant of ␤ = 10 27 . In gold plating baths containing sulfite and thiosulfate ligands, the speciation model predicts that the dominant species at neutral or basic are mixed complexes of the form Au͑S 2 O 3 ͒͑SO 3 ͒ 3− and Au͑S 2 O 3 ͒͑SO 3 ͒ 2 5− . The thiosulfate complex Au͑S 2 O 3 ͒ 2 3− is only dominant under acidic conditions. It is shown that the electrodeposition characteristics reported in many studies can be interpreted in terms of the existence of such mixed ligand complexes. Finally, the effect of the stability of various gold plating solutions on colloidal gold formation has been explored. For free-standing solutions, decomposition is more likely to occur via the disproportionation of Au͑I͒ species such as AuOH, Au͑OH͒ 2 − , and AuCl 2 − rather than free aurous ions. The stability of gold baths during electrodeposition is mainly influenced by the formation of dithionite ions which reduce Au͑I͒ complexes to form colloidal gold.

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Section: Input Data For Speciation Modelmentioning

confidence: 99%

Speciation Analysis of Au(I) Electroplating Baths Containing Sulfite and Thiosulfate

Green¹,

Roy

2006

J. Electrochem. Soc.

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“…In turn, this reaction promotes stripping of gold oxide, what enables anodic oxidation of gold. Moreover, the sulfite anions facilitate gold electrodissolution via gold complex anions formation . This hypothesis is supported by the fact that AuNPs are practically inactive in the solution of oxidizing acid or sulfite, in contrast to the solution of both components (Figs.…”

Section: Resultsmentioning

confidence: 81%

Continuous Electrochemical Detection of Gold Nanoparticles in Flow

et al. 2017

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Nanoparticles have already found numerous applications and their global production is still increasing. Therefore, the engineered nanoobjects of uncertain toxicity become ubiquitous in the environment and a continuous monitoring of their presence is highly desirable. Here, we demonstrate a continuous electrochemical detection of gold nanoparticles (AuNPs) based on synchronous processes of their electrodissolution and electrocatalysis. This approach is realized by the injection of nanoparticles suspension into the Flow Injection Analysis (FIA) system. The modular structure of FIA system is particularly applicable for carrying out of sequential operations: AuNPs passivation, oxidation of aqueous SO2 and gold. It enables continuous, fast and reproducible gold nanoparticles determination in a wide concentration range: 10−10– 10−7 mol nanoobjects L−1.

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“…An immersion time in the clearing baths (iii) -(v) of about 10 minutes each seems adequate to remove all iron(III) and gold salts from the paper, to levels below detection by chemical spot tests. The sulphite reduces the iron(III) to iron(II), and forms strong, and relatively stable, soluble gold(I) complexes (31). Tetrasodium EDTA at high pH is an effective chelate for iron(II).…”

Section: The Practice Of New Chrysotypementioning

confidence: 99%

Chrysotype: Photography in nanoparticle gold

Ware

2006

Gold Bull

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The sulphito complexes of gold

Cited by 20 publications

References 19 publications

Speciation Analysis of Au(I) Electroplating Baths Containing Sulfite and Thiosulfate

Speciation Analysis of Au(I) Electroplating Baths Containing Sulfite and Thiosulfate

Continuous Electrochemical Detection of Gold Nanoparticles in Flow

Chrysotype: Photography in nanoparticle gold

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