The crystal structure of α-Ag<sub>3</sub>NSeO<sub>3</sub>

Fawcett, John; Kocman, V.; Nyburg, S. C.; O’Brien, Robert

doi:10.1039/c29690001198

Cited by 20 publications

(12 citation statements)

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“…254 The crystal structure of α-Ag 3 NSeO 3 consists of infinite chains of O 3 SeNAg 3 molecules joined by O· · ·Ag-N bridges, 255 in agreement with earlier IR results. 256 The molecules have almost regular tetrahedral configurations at each end and the Se-O and N-Ag bonds are almost eclipsed with a dihedral angle of 11.1…”

Section: 253supporting

confidence: 82%

Selenium: Inorganic ChemistryBased in part on the article Selenium: Inorganic Chemistry by Bernt Krebs, Stefan Bonmann, & Illenora Eidenschink which appeared in theEncyclopedia of Inorganic Chemistry, First Edition.

Atwood

2005

Encyclopedia of Inorganic Chemistry

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Selenium is the first member of the group 16 elements O, S, Se, Te, and Po that shows some metallic character. The increasing metallic character in the series O, S, Se, Te, Po is reflected also in the lower electronegativity, in the less acid character of the oxides, and in the lower stability of the oxidation number +VI for selenium compared to sulfur. There is a large variety of compounds of SeII, SeIV, and SeVI with the electronegative elements N, O, F, Cl, and Br. Thus, there are six general types of compounds, and these will comprise the main sections in the article. They are cations, halides, oxides, haloselenates, oxohaloselenates, and the related compounds that form when both selenium and nitrogen are present in the molecule.

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Section: 253supporting

confidence: 82%

Selenium: Inorganic ChemistryBased in part on the article Selenium: Inorganic Chemistry by Bernt Krebs, Stefan Bonmann, & Illenora Eidenschink which appeared in theEncyclopedia of Inorganic Chemistry, First Edition.

Atwood

2005

Encyclopedia of Inorganic Chemistry

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“…Since the first report of an inhibitory influence of high Ilevels on iodinatio,i in vivo (Wolff-Chaikoff effect) [15, 161 several attempts have been made to investigate the mechanism of this inhibition. According to one of the earlier studies [27], the inhibitory effect of high Iconcentrations was attributed to the complexation of I2 to I;, assuming that I2 is the active iodinating agent [27,301. Later on, Taurog reported that I2 is not the active iodinating agent in peroxidase-catalyzed iodination and that the above mechanism could therefore not hold [IS].…”

Section: Discussionmentioning

confidence: 97%

Mechanism of enzymatic and non-enzymatic tyrosine iodination Inhibition by excess hydrogen peroxide and/or iodide

Huwiler

Bürgi

Köhler

2008

European Journal of Biochemistry

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Non‐enzymatic (I2‐mediated) and lactoperoxidase‐catalyzed iodination of tyrosine are inhibited by excess iodide (I−) and/or hydrogen peroxide (H2O2). This phenomenon is a consequence of the concentration‐dependent dual role of I− and H2O2 in the iodinating system. I− and H2O2, in addition to their function as primary substrates of peroxidase, may act as alternative ‘iodine acceptors’ and therefore compete with tyrosine for the active iodinating agent, irrespective of whether this compound is an enzyme‐associated iodinium cation (E · Iδ+) or an equivalent oxidized iodine species (IOH, ICI, I2). The competitive reaction pathways resulting from excess I− and/or H2O2 in the iodination system are I2/I−3 generation and/or pseudo‐catalatic degradation of H2O2, respectively. Our results also demonstrate that I2 (and alternative medium‐dependent oxidized iodine species such as IOH and ICI) generated in the iodination system may play an important role as iodinating agent(s). They serve as a substitute for the enzyme‐bound iodinium species (E · Iδ+), if the prevailing I− concentration favours this pathway. The proposed mechanism of the various antagonistic and interactive reaction pathways is summarized in a scheme.

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“…The consequence of Zn 2 , Cd 2 and Cu 2 (Cu ) being targeted e¡ectively by ligands in the cell which do not bind so strongly to Fe 2 is that even though proteins may well exist in which a cluster fragment such as [3Fe-4S] 0 has a higher absolute a¤nity for Zn 2 or Cu than for Fe 2 (Da Fd III is one example) free heterometals are of such low concentration relative to Fe 2 that they cannot compete with iron in the [4Fe-4S] cluster. Similar considerations will apply in the synthesis of heterometal cluster analogues, where integration of any particular metal ion M within a [M3Fe-4S] cluster must compete with its coordination by simple ligands present in the reacting mixture [13].…”

Section: E¡ective Biological Concentrations: Fe(ii) Vs Competing Metamentioning

confidence: 91%

Thermodynamic influences on the fidelity of iron‐sulphur cluster formation in proteins

Armstrong¹,

Williams²

1999

FEBS Letters

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In an organism, two thermodynamic factors are important in ensuring that homometallic [4Fe-4S] cubane clusters are formed in preference to clusters containing heterometals such as Zn or Cu. These are the electronic resonance stabilisation, which boosts the binding of Fe(II) within an Fe-S cluster relative to its normally low position in the Irving-Williams order, and attenuation of the cytoplasmic concentrations of competing metals such as Zn or Cu by specific ligands.z 1999 Federation of European Biochemical Societies.

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The crystal structure of α-Ag₃NSeO₃

Cited by 20 publications

References 0 publications

Selenium: Inorganic ChemistryBased in part on the article Selenium: Inorganic Chemistry by Bernt Krebs, Stefan Bonmann, & Illenora Eidenschink which appeared in theEncyclopedia of Inorganic Chemistry, First Edition.

Selenium: Inorganic ChemistryBased in part on the article Selenium: Inorganic Chemistry by Bernt Krebs, Stefan Bonmann, & Illenora Eidenschink which appeared in theEncyclopedia of Inorganic Chemistry, First Edition.

Mechanism of enzymatic and non-enzymatic tyrosine iodination Inhibition by excess hydrogen peroxide and/or iodide

Thermodynamic influences on the fidelity of iron‐sulphur cluster formation in proteins

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The crystal structure of α-Ag3NSeO3

Cited by 20 publications

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Selenium: Inorganic ChemistryBased in part on the article Selenium: Inorganic Chemistry by Bernt Krebs, Stefan Bonmann, & Illenora Eidenschink which appeared in theEncyclopedia of Inorganic Chemistry, First Edition.

Selenium: Inorganic ChemistryBased in part on the article Selenium: Inorganic Chemistry by Bernt Krebs, Stefan Bonmann, & Illenora Eidenschink which appeared in theEncyclopedia of Inorganic Chemistry, First Edition.

Mechanism of enzymatic and non-enzymatic tyrosine iodination Inhibition by excess hydrogen peroxide and/or iodide

Thermodynamic influences on the fidelity of iron‐sulphur cluster formation in proteins

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The crystal structure of α-Ag₃NSeO₃