Complexation of Ag+ ions with L-cysteine

Алексеев, В. Г.; Semenov, Alexei; Пахомов, П. М.

doi:10.1134/s0036023612070029

Cited by 21 publications

(12 citation statements)

References 14 publications

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“…This well agrees with the data of potentiometric measurements in ref. 35, where binuclear protonated complexes Ag 2 HCys + (Fig. 8a) were shown to be the dominant form in CSS at pH B 3.…”

Section: The Results Of the Experimental Study Of Solutions And Gels mentioning

confidence: 93%

Mechanism of gelation in low-concentration aqueous solutions of silver nitrate with l-cysteine and its derivatives

et al. 2017

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We discuss the results of experimental studies of the processes of gelation in aqueous solutions of silver nitrate with l-cysteine and its derivatives. We focus on understanding what determines if these small molecules will self-assemble in water at their extremely low concentration to form a gel. A mechanism of gel formation in a cysteine-silver solution (CSS) is proposed. The analysis of the results indicates that filamentary aggregates of a gel network are formed via interaction of NH and C(O)O groups that belong to neighboring silver mercaptide (SM) aggregates. In turn, formation of sulphur-silver bonds between silver mercaptide molecules is responsible for self-assembling these molecules into SM aggregates which can be considered as supramonomers. Free polar groups located on the surfaces of the aggregates can form hydrogen bonds with water molecules, which explains the unique ability of CSS hydrogels to trap water at low concentrations of low-molecular-weight hydrogelators.

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“…This well agrees with the data of potentiometric measurements in ref. 35, where binuclear protonated complexes Ag 2 HCys + (Fig. 8a) were shown to be the dominant form in CSS at pH B 3.…”

Section: The Results Of the Experimental Study Of Solutions And Gels mentioning

confidence: 93%

Mechanism of gelation in low-concentration aqueous solutions of silver nitrate with l-cysteine and its derivatives

et al. 2017

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“…Before the addition of NaBH 4 , to the bath, the reactions mainly deals with the coordination of the sulfur atom of the Cys 2À anion to Ag + ions followed by the protonation of the amine and carboxylate groups of the Cys 2À moiety as described in detail by Alekseev et al [7]. This reveals that silver has a tendency to form bi-metallic complexes with the NAC moiety, which can be explained with the help of the following reactions:…”

Section: Proposed Mechanismmentioning

confidence: 94%

N-acetyle cysteine assisted synthesis of core⿿shell Ag2S with enhanced light transmission and diminished reflectance: Surface modifier for c-SiNx solar cells

Banerjee

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Kundu

et al. 2016

Journal of Industrial and Engineering Chemistry

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“…Recently, Alekseev et al reported formation constants (log β) for several Ag(I)-cysteine complexes: AgCys − (11.14 ± 0.10), AgHCys (20.77 ± 0.06), Ag 2 Cys (20.32 ± 0.17) and Ag 2 HCys + (27.28 ± 0.12). 38 …”

Section: Introductionmentioning

confidence: 99%

“…Recently, Alekseev et al reported formation constants (log β) for several Ag(I)− cysteine complexes: AgCys − (11.14 ± 0.10), AgHCys (20.77 ± 0.06), Ag 2 Cys (20.32 ± 0.17), and Ag 2 HCys + (27.28 ± 0.12). 38 The present investigation was performed to increase the general understanding of silver(I) complex formation with biologically relevant thiol-containing ligands, including cysteine, penicillamine, and glutathione, as part of our systematic studies on heavy-metal complex formation with such ligands in aqueous solution and in the solid state. 39−45 We report crystal structures of the compounds (NH 4 )Ag 2 (HCys)(Cys)•H 2 O (1) and Ag(HPen)•H 2 O (2), from crystals prepared at pH ∼10 for both compounds.…”

Section: ■ Introductionmentioning

confidence: 99%

Silver(I) Complex Formation with Cysteine, Penicillamine, and Glutathione

et al. 2013

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The complex formation between silver(I) and cysteine (H2Cys), penicillamine (H2Pen) or glutathione (H3Glu) in alkaline aqueous solution was examined using extended X-ray absorption fine structure (EXAFS) and 109Ag NMR spectroscopic techniques. The complexes formed in 0.1 mol·dm−3 Ag(I) solutions with cysteine and penicillamine were investigated for ligand/Ag(I) (L/Ag) mole ratios increasing from 2.0 to 10.0. For the series of cysteine solutions (pH 10 - 11) a mean Ag-S bond distance 2.45 ± 0.02 Å consistently emerged, while for penicillamine (pH 9) the average Ag-S bond distance gradually increased from 2.40 to 2.44 ± 0.02 Å. EXAFS and 109Ag NMR spectra of a concentrated Ag(I)-cysteine solution (CAg(I) = 0.8 mol·dm−3, L/Ag = 2.2) showed the mean Ag-S bond distance 2.47 ± 0.02 Å and δ(109Ag) = 1103 ppm, consistent with prevailing, partially oligomeric AgS3 coordinated species, while for penicillamine (CAg(I) = 0.5 mol·dm−3, L/Ag = 2.0) the mean Ag-S bond distance 2.40 ± 0.02 Å and δ(109Ag) = 922 ppm indicate that mononuclear AgS2 coordinated complexes dominate. For Ag(I)-glutathione solutions (CAg(I) = 0.01 mol·dm−3, pH ~ 11), mononuclear AgS2 coordinated species with the mean Ag-S bond distance 2.36 ± 0.02 Å dominate for L/Ag mole ratios from 2.0 to 10.0. The crystal structure of the silver(I)-cysteine compound (NH4)Ag2(HCys)(Cys)·H2O (1) precipitating at pH ~ 10 was solved and showed a layer structure with both AgS3 and AgS3N coordination to the cysteinate ligands. A redetermination of the crystal structure of Ag(HPen)·H2O (2) confirmed the proposed digonal AgS2 coordination environment to bridging thiolate sulfur atoms in polymeric intertwining chains forming a double helix. A survey of Ag-S bond distances for crystalline Ag(I) complexes with S-donor ligands in different AgS2, AgS2(O/N) and AgS3 coordination environments was used, together with a survey of 109Ag NMR chemical shifts, to assist assignments of the Ag(I) coordination in solution.

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Complexation of Ag+ ions with L-cysteine

Cited by 21 publications

References 14 publications

Mechanism of gelation in low-concentration aqueous solutions of silver nitrate with l-cysteine and its derivatives

Mechanism of gelation in low-concentration aqueous solutions of silver nitrate with l-cysteine and its derivatives

N-acetyle cysteine assisted synthesis of core⿿shell Ag2S with enhanced light transmission and diminished reflectance: Surface modifier for c-SiNx solar cells

Silver(I) Complex Formation with Cysteine, Penicillamine, and Glutathione

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