Complex Ion Formation of Mercury(II) and Thiosulfate Ion

Nyman, C. J.; Salazar, Teresa.

doi:10.1021/ac60179a005

Cited by 14 publications

(5 citation statements)

References 17 publications

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“…[23] No precipitate was observed for S 2 O 3 2À , as Hg II thiosulfate complexes are water-soluble. [24] Mass spectrometry (ESI + ) experiments on solutions containing Hg II complex 10 b and each of the anions were consistent with the fluorescence results (see Supporting Information). The mass spectra of complex 10 b mixed with Br À , I À , SCN À and S 2 O 3 À do not show a peak for the intact Hg II complex, and instead have one dominant peak that corresponds to the free ligand 3 (m/z 454 [M + H] + ).…”

Section: Wwwchemeurjorgsupporting

confidence: 77%

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A Click Fluorophore Sensor that Can Distinguish Cu^II and Hg^II via Selective Anion‐Induced Demetallation

Lau

Price

Todd

et al. 2011

Chemistry A European J

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A cyclam-based fluorescent sensor featuring a novel triazole pendant arm has been synthesised using click chemistry. The sensor is highly responsive to both Cu(II) and Hg(II) in neutral aqueous solution and displays excellent selectivity in the presence of various competing metal ions in 50-fold excess. The addition of specific anions such as I(-) and S(2)O(3)(2-) causes a complete revival of fluorescence only in the case of Hg(II), providing a simple and effective method for distinguishing solutions containing Cu(II), Hg(II) or a mixture of both ions, even in doped seawater samples. X-ray crystal structures of both the Hg(II) sensor complex and a model Cu(II) complex show that pendant triazole coordination occurs through the central nitrogen atom (N2), providing to the best of our knowledge the first reported examples of this unusual coordination mode in macrocycles. Fluorescence, mass spectrometry and (1)H NMR experiments reveal that the mechanism of anion-induced fluorescence revival involves either displacement of pendant coordination or complete removal of the Hg(II) from the macrocycle, depending on the anion.

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Section: Wwwchemeurjorgsupporting

confidence: 77%

“…[23] No precipitate was observed for S 2 O 3 2À , as Hg II thiosulfate complexes are water-soluble. [24] Mass spectrometry (ESI + ) experiments on solutions containing Hg (Figure 9). This shift is most pronounced in the peaks corresponding to the hydrogens of the cyclam ring and the triazole, due to their proximity to the metal centre.…”

Section: Resultsmentioning

confidence: 99%

A Click Fluorophore Sensor that Can Distinguish Cu^II and Hg^II via Selective Anion‐Induced Demetallation

Lau

Price

Todd

et al. 2011

Chemistry A European J

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“…The quantity Fa(X) was calculated according to Equation 1. If the assumptions are valid that the activity coefficients of the simple and complex ions are equal and that the activity coefficient of the uncharged free ligand is unity, than the formation constants calculated from F0(X) are thermodynamic constants (9).…”

Section: Treatment Of Experimental Datamentioning

confidence: 99%

Thermodynamic Constants of Complex Ion Formation between Mercury(II) and Three Alkylamines

Roe¹,

Masson²,

Nyman³

1961

Anal. Chem.

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“…: log K 1 = 29.27, log K 2 = 30.8, Nyman and Salazar (1961)). For cadmium, ethylenediaminetetraacetic acid (EDTA) was chosen as the internal ligand (Cd(EDTA) 2+ , log K = 18.1, Martell et al (2004)).…”

Section: -mentioning

confidence: 99%

Interactions Between Silver Nanoparticles/Silver Ions and Liposomes: Evaluation of the Potential Passive Diffusion of Silver and Effects of Speciation

Guilleux

Campbell

Fortin

2018

Arch Environ Contam Toxicol

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Silver nanoparticles, used mainly for their antibacterial properties, are among the most common manufactured nanomaterials. How they interact with aquatic organisms, especially how they cross biological membranes, remains uncertain. Free Ag + ions, released from these nanoparticles, are known to play an important role in their overall bioavailability. In this project, we have studied the uptake of dissolved and nanoparticulate silver by liposomes. These unilamellar vesicles, composed of phospholipids, have long been used as models for natural biological membranes, notably to study the potential uptake of solutes by passive diffusion through the phospholipid bilayer. The liposomes were synthesized using extrusion techniques and were exposed over time to dissolved silver under different conditions where Ag + , AgS 2 O 3 or AgCl 0 were the dominant species. Similar experiments were conducted with the complexes HgCl 2 0 and Cd(DDC) 2 0 , both of which are hydrophobic and known to diffuse passively through biological membranes. The uptake kinetics of Ag + , HgCl 2 0 and Cd(DDC) 2 0 show no increase in internalized concentrations over time, unlike AgS 2 O 3 and AgCl 0 , which appear to pass through the phospholipid bilayer. These results are in contradiction with our initial hypothesis that lipophilic Hg and Cd complexes would be able to cross the membrane whereas silver would not. Encapsulated tritiated water inside the liposomes was shown to rapidly diffuse through the lipid bilayer, suggesting a high permeability. We hypothesize that monovalent anions or complexes as well as small neutral complexes with a strong negative dipole can diffuse through our model membrane. Finally, liposomes were exposed to 5-nm polyvinylpyrrolidone-coated silver nanoparticles over time. No significant uptake of nanoparticulate silver was observed. Neither disruption of the membrane nor invagination of nanoparticles into the liposomes was observed. This suggests that the main risk caused by AgNPs for non-endocytotic biological cells would be the elevation of the free silver concentration near the membrane surface due to adsorption of AgNPs and subsequent oxidation/dissolution.

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Complex Ion Formation of Mercury(II) and Thiosulfate Ion

Cited by 14 publications

References 17 publications

A Click Fluorophore Sensor that Can Distinguish Cu^II and Hg^II via Selective Anion‐Induced Demetallation

A Click Fluorophore Sensor that Can Distinguish Cu^II and Hg^II via Selective Anion‐Induced Demetallation

Thermodynamic Constants of Complex Ion Formation between Mercury(II) and Three Alkylamines

Interactions Between Silver Nanoparticles/Silver Ions and Liposomes: Evaluation of the Potential Passive Diffusion of Silver and Effects of Speciation

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Complex Ion Formation of Mercury(II) and Thiosulfate Ion

Cited by 14 publications

References 17 publications

A Click Fluorophore Sensor that Can Distinguish CuII and HgII via Selective Anion‐Induced Demetallation

A Click Fluorophore Sensor that Can Distinguish CuII and HgII via Selective Anion‐Induced Demetallation

Thermodynamic Constants of Complex Ion Formation between Mercury(II) and Three Alkylamines

Interactions Between Silver Nanoparticles/Silver Ions and Liposomes: Evaluation of the Potential Passive Diffusion of Silver and Effects of Speciation

Contact Info

Product

Resources

About

A Click Fluorophore Sensor that Can Distinguish Cu^II and Hg^II via Selective Anion‐Induced Demetallation

A Click Fluorophore Sensor that Can Distinguish Cu^II and Hg^II via Selective Anion‐Induced Demetallation