On Gold(I) Complexes and Anodic Gold Dissolution in Sulfite–Thiourea Solutions

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On Gold(I) Complexes and Anodic Gold Dissolution in Sulfite–Thiourea Solutions. / Mironov, Igor V.; Kal’nyi, Danila B.; Kokovkin, Vasiliy V.

In: Journal of Solution Chemistry, Vol. 46, No. 4, 01.04.2017, p. 989-1003.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{21f61ec6cbb9422aa584ce07e865727f,

title = "On Gold(I) Complexes and Anodic Gold Dissolution in Sulfite–Thiourea Solutions",

abstract = "Processes involving gold(I) complexes were studied in sulfite–thiourea (TU) solutions. It is shown that at pH >5 the complex [AuTU2+] undergoes irreversible decomposition followed by deprotonation and formation of a solid phase. From the data of pH in mixed solutions, the equilibrium constants were evaluated: Au(SO3)23-+iTU⇌Au(SO3)2-iTUi2i-3+iSO32-, log10β1 = −1.2, log10β2 = −3.6. Some aspects of the anodic dissolution of gold in mixed sulfite–thiourea solutions are considered. With the help of the carbonate buffer system the change of the anodic current density ja was studied at high pH; ja (pH) has a maximum at pH 11.6–11.9 for Ea = 0.3–0.6 V (vs. NHE). At pH > 12.0, the ja values decrease sharply. Possible mechanisms of anodic gold dissolution, as well as the role of sulfite, are discussed.",

keywords = "Anodic dissolution, Complexes of gold(I), Gold, Sulfite, Thiocarbamide, Thiourea, OXIDATION, MECHANISM, BEHAVIOR, AU(111), ELECTROOXIDATION, THIOSULFATE, REDUCTION, FORMAMIDINE DISULFIDE, KINETICS, THIOCARBAMIDE",

author = "Mironov, {Igor V.} and Kal{\textquoteright}nyi, {Danila B.} and Kokovkin, {Vasiliy V.}",

year = "2017",

month = apr,

day = "1",

doi = "10.1007/s10953-017-0616-9",

language = "English",

volume = "46",

pages = "989--1003",

journal = "Journal of Solution Chemistry",

issn = "0095-9782",

publisher = "Springer New York",

number = "4",

}

RIS

TY - JOUR

T1 - On Gold(I) Complexes and Anodic Gold Dissolution in Sulfite–Thiourea Solutions

AU - Mironov, Igor V.

AU - Kal’nyi, Danila B.

AU - Kokovkin, Vasiliy V.

PY - 2017/4/1

Y1 - 2017/4/1

N2 - Processes involving gold(I) complexes were studied in sulfite–thiourea (TU) solutions. It is shown that at pH >5 the complex [AuTU2+] undergoes irreversible decomposition followed by deprotonation and formation of a solid phase. From the data of pH in mixed solutions, the equilibrium constants were evaluated: Au(SO3)23-+iTU⇌Au(SO3)2-iTUi2i-3+iSO32-, log10β1 = −1.2, log10β2 = −3.6. Some aspects of the anodic dissolution of gold in mixed sulfite–thiourea solutions are considered. With the help of the carbonate buffer system the change of the anodic current density ja was studied at high pH; ja (pH) has a maximum at pH 11.6–11.9 for Ea = 0.3–0.6 V (vs. NHE). At pH > 12.0, the ja values decrease sharply. Possible mechanisms of anodic gold dissolution, as well as the role of sulfite, are discussed.

AB - Processes involving gold(I) complexes were studied in sulfite–thiourea (TU) solutions. It is shown that at pH >5 the complex [AuTU2+] undergoes irreversible decomposition followed by deprotonation and formation of a solid phase. From the data of pH in mixed solutions, the equilibrium constants were evaluated: Au(SO3)23-+iTU⇌Au(SO3)2-iTUi2i-3+iSO32-, log10β1 = −1.2, log10β2 = −3.6. Some aspects of the anodic dissolution of gold in mixed sulfite–thiourea solutions are considered. With the help of the carbonate buffer system the change of the anodic current density ja was studied at high pH; ja (pH) has a maximum at pH 11.6–11.9 for Ea = 0.3–0.6 V (vs. NHE). At pH > 12.0, the ja values decrease sharply. Possible mechanisms of anodic gold dissolution, as well as the role of sulfite, are discussed.

KW - Anodic dissolution

KW - Complexes of gold(I)

KW - Gold

KW - Sulfite

KW - Thiocarbamide

KW - Thiourea

KW - OXIDATION

KW - MECHANISM

KW - BEHAVIOR

KW - AU(111)

KW - ELECTROOXIDATION

KW - THIOSULFATE

KW - REDUCTION

KW - FORMAMIDINE DISULFIDE

KW - KINETICS

KW - THIOCARBAMIDE

UR - http://www.scopus.com/inward/record.url?scp=85028242466&partnerID=8YFLogxK

U2 - 10.1007/s10953-017-0616-9

DO - 10.1007/s10953-017-0616-9

M3 - Article

AN - SCOPUS:85028242466

VL - 46

SP - 989

EP - 1003

JO - Journal of Solution Chemistry

JF - Journal of Solution Chemistry

SN - 0095-9782

IS - 4

ER -

ID: 9962967