The elements OXYGEN; POLONIUM; SELENIUM; SULFUR; and TELLURIUM; that form group 16 (formerly group VI) of the periodic table.

A novel push-pull Diels-Alder diene: reactions of 4-alkoxy- or 4-phenylsulfenyl-5-chalcogene-substituted 1-phenylpenta-2,4-dien-1-one with electron-deficient dienophiles. (1/16)

5-(phenylselenenyl)- and 5-(phenylsulfenyl)-4-ethoxy-1-phenyl-2,4-pentadien-1-ones (2) and (3) underwent [4+2] cycloaddition with N-methyl and N-phenylmaleimides and successive isomerization to give the 7-benzoyl-3a,4,5,7a-tetrahydro-1H-isoindole-1,3(2H)-diones 5, 8 and 9 in good yields. The 4-ethoxy group on the 2,4-pentadien-1-one was found to be effective to facilitate the cycloaddition with dienophiles. We also performed other [4+2] cycloadditions of 2,4-pentadien-1-ones with DMAD or naphthoquinone.  (+info)

Redox catalysts as sensitisers towards oxidative stress. (2/16)

The predominance of oxidative stress in many tumour cell environments provides a means to selectively target these cells via protein oxidation. The zinc fingers of transcription factors utilise cysteine thiols for structural zinc coordination. Redox control of DNA binding regulates transcription and therefore the overall rates of proliferation, apoptosis and necrosis in the carcinoma. We report here the adverse effects of glutathione peroxidase (GPx) mimics towards zinc finger motifs and PC12 cell survival. Nanomolar catalyst concentrations facilitated H2O2-induced oxidation of an Sp1 transcription factor fragment. In PC12 cells GPx catalysis triggered a significant increase in cell death, correlating with severity of oxidative stress. As a consequence, we conclude that GPx mimics are potential chemotherapeutic agents.  (+info)

Synthesis and properties of benzo[a]phenoxazinium chalcogen analogues as novel broad-spectrum antimicrobial photosensitizers. (3/16)

The goal of this investigation was to develop improved photosensitizers for use as antimicrobial drugs in photodynamic therapy of localized infections. Replacement of the oxygen atom in 5-(ethylamino)-9-diethylaminobenzo[a]phenoxazinium chloride (1) with sulfur and selenium afforded thiazinium and selenazinium analogues 2 and 3, respectively. All three dyes are water soluble, lipophilic, and red light absorbers. The relative photodynamic activities of the chalcogen series were evaluated against a panel of prototypical pathogenic microorganisms: the Gram-positive Enterococcus faecalis, the Gram-negative Escherichia coli, and the fungus Candida albicans. Selenium dye 3 was highly effective as a broad-spectrum antimicrobial photosensitizer with fluences of 4-32 J/cm2 killing 2-5 more logs of all cell types than sulfur dye 2, which was slightly more effective than oxygen analogue 1. These data, taken with the findings of uptake and retention studies, suggest that the superior activity of selenium derivative 3 can be attributed to its much higher triplet quantum yield.  (+info)

Cesium carbonate-catalyzed alpha-phenylchalcogenation of carbonyl compounds with diphenyl dichalcogenide. (4/16)

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Intramolecular chalcogen-tin interactions in [(o-MeEC6H4)CH2]2SnPh(2-n)Cl(n) (E = S, O, CH2; n = 0, 1, 2) and intermolecular chlorine-tin interactions in the meta- and para-methoxy isomers. (5/16)

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Mitochondrial dysfunction induced by different organochalchogens is mediated by thiol oxidation and is not dependent of the classical mitochondrial permeability transition pore opening. (6/16)

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Mysteries of TOPSe revealed: insights into quantum dot nucleation. (7/16)

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Chalcogenidobis(ene-1,2-dithiolate)molybdenum(IV) complexes (chalcogenide E = O, S, Se): probing Mo identical withE and ene-1,2-dithiolate substituent effects on geometric and electronic structure. (8/16)

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... there are a total of 13 chalcogen fluorides, nine chalcogen chlorides, eight chalcogen bromides, and six chalcogen iodides that ... Chalcogens also form compounds with halogens known as chalcohalides, or chalcogen halides. The majority of simple chalcogen ... Such compounds tend to feature sulfur as the chalcogen. There are also chalcogen borides with two, three, or four chalcogens. ... Almost all chalcogen pnictide salts are typically in the form of [PnxE4x]3−, where Pn is a pnictogen and E is a chalcogen.[ ...
... chalcogen bonding can occur between two chalcogens, resulting in a chalcogen-chalcogen bond. Non-covalent interactions are well ... chalcogen-chalcogen bonding will be favored. It is hypothesized that electrostatic forces should only dominate in a chalcogen- ... "Theoretical Investigations on Heteronuclear ChalcogenChalcogen Interactions: On the Nature of Weak Bonds between Chalcogen ... Chalcogen bonding is a result of the same interaction. However, it is possible for chalcogens to form multiple sigma bonds and ...
The chalcogens react with each other to form interchalcogen compounds. Although no chalcogen is extremely electropositive, nor ...
... the chalcogens; 17, the halogens; and 18, the helium group, composed of the noble gases (excluding helium) and oganesson. ...
These elements are all in the 16th periodic table column (chalcogens), so have similar properties. In each case, changing the ... Devillanova FA, Du Mont W (2013). Handbook of Chalcogen Chemistry. Vol. 1: new perspectives in sulfur, selenium and tellurium ( ... Bouroushian M (2010). "Electrochemistry of the Chalcogens". Electrochemistry of Metal Chalcogenides. Monographs in ...
The Chalcogen Bond in Crystalline Solids: A World Parallel to Halogen Bond Accounts of Chemical Research 2019, 52, 1311-1324 ( ... He has a particular focus on self-assembly processes driven by halogen bonds and chalcogen bonds. Resnati was born in Monza, ... chalcogen bond. green chemistry van der Waals Prize 2021 (awarded in 2022 by the 2nd International Conference on Noncovalent ...
Chivers, Tristram; Laitinen, Risto S. (23 March 2015). "Tellurium: a maverick among the chalcogens". Chemical Society Reviews. ...
Molten lead reacts with the chalcogens to give lead(II) chalcogenides. Lead metal resists sulfuric and phosphoric acid but not ... Lead commonly reacts with heavier chalcogens. Lead sulfide is a semiconductor, a photoconductor, and an extremely sensitive ...
Similarly, phosphoramidites react with other chalcogens. When brought in contact with a solution of sulfur or a number of ...
Wickleder, Mathias S. (2007). "Chalcogen-Oxygen Chemistry". In Francesco A. Devillanova (ed.). Handbook of chalcogen chemistry ... Of the chalcogens (oxygen-family elements), tellurium has the highest melting and boiling points, at 722.66 K (449.51 °C) and ... Tellurium is chemically related to selenium and sulfur, all three of which are chalcogens. It is occasionally found in native ... ISBN 0-12-023627-3. Xu, Zhengtao (2007). "Recent developments in binary halogen-chalcogen compounds, polyanions and polycations ...
Wickleder, Mathias S. (2007). "Chalcogen-Oxygen Chemistry". In Francesco A. Devillanova (ed.). Handbook of chalcogen chemistry ... Tellurium compounds are compounds containing the element tellurium (Te). Tellurium belongs to the chalcogen (group 16) family ... ISBN 0-12-352651-5. Xu, Zhengtao (2007). "Recent developments in binary halogen-chalcogen compounds, polyanions and polycations ... a highly unstable analogue of the other chalcogen hydrides, H 2O, H 2S and H 2Se: ZnTe + 2 HCl → ZnCl 2 + H 2Te H 2Te is ...
Chivers, Tristram; Laitinen, Risto S. (2006). "Chalcogen-Nitrogen Chemistry". In Devillanova, Francesco (ed.). Handbook of ... Chalcogen Chemistry. London: The Royal Society of Chemistry. p. 238. doi:10.1039/9781847557575. ISBN 978-0-85404-366-8. Steve ...
Handbook of Chalcogen Chemistry. Vol. 2. pp. 127-179. doi:10.1039/9781849737463-00127. ISBN 978-1-84973-624-4. Retrieved 2021- ... Handbook of Chalcogen Chemistry: 797-830. doi:10.1039/9781847557575-00797. (Coordination complexes, Thiols, Chelating agents, ...
... is a chalcogen. A rare and highly radioactive metal with no stable isotopes, polonium is chemically similar to ... Chalcogens, Post-transition metals, Element toxicology, IARC Group 1 carcinogens, Science and technology in Poland, Marie Curie ...
"Chalcogen ring interconversion pathways. 77Se NMR spectroscopic study of the decomposition of 1,2,3,4,5-Se5S2 to 1,2,3,4,5,6- ...
Selenium is a chalcogen. Selenium is red in monomolar structure but metallic gray in its crystalline structure. Bromine (Br) is ...
Gregoryanz E; Struzhkin V; Hemley, R J; Eremets, M I; Mao Ho-Kwang; Timofeev Y A (2002). "Superconductivity in the chalcogens ...
Reactions with chalcogens are highly exothermic (release energy); the reaction with oxygen or air occurs at room temperature. ...
Ⓚ Of 103 elements shown in the image, just ten form anions, all of these being in the p-block: arsenic; the five chalcogens: ...
... may form bonds to the other chalcogens; these include S7At+ and At(CSN)−2 with sulfur, a coordination selenourea ...
Astatine may form bonds to the other chalcogens; these include S7At+ and At(CSN)− 2 with sulfur, a coordination selenourea ...
Mixed chalcogen halides also exist. In the gas phase the phosphorus pentahalides have trigonal bipyramidal molecular geometry ... The trihalides are fairly readily oxidized by chalcogens to give the corresponding oxyhalides or equivalents. Phosphorus(II) ...
2. Unsymmetrical Diatomic Chalcogen Bridges". Journal of the American Chemical Society. 99 (23): 7743-7744. doi:10.1021/ ...
Kelly, P. F.; Slawin, A. M. Z.; Williams, D. J.; Woollins, J. D. (1992). "Caged explosives: Metal-Stabilized Chalcogen Nitrides ... Chivers, T. (2004). A Guide To Chalcogen-Nitrogen Chemistry. Singapore: World Scientific Publishing. ISBN 981-256-095-5. Sharma ...
"Phase Equilibria in Lithium-Chalcogen Systems". Journal of the Electrochemical Society. The Electrochemical Society. 120 (3): ...
"Recent chemistry of the chalcogen diatomics". Tetrahedron. 53 (36): 12225-12236. doi:10.1016/S0040-4020(97)00555-3. Spencer, J ...
It has also been found that some iron chalcogens superconduct. The undoped β-FeSe is the simplest iron-based superconductor but ...
Gallium reacts with the chalcogens only at relatively high temperatures. At room temperature, gallium metal is not reactive ...
... reacts with the chalcogens only at relatively high temperatures. At room temperature, gallium metal is not reactive ...
Chalcogen, and Halogen Bonds". Angewandte Chemie International Edition. 57 (19): 5408-5412. doi:10.1002/anie.201801452. PMC ...
group 16 (chalcogens). Period. period 3. Block. p-block. Electron configuration. [Ne] 3s2 3p4. ...
Chalcogen, Disordered, Lanthanoid, Rare earth, Cu-La-O-Sr, Seebeck coefficient, Tetragonal term(s) ... Alkaline, Chalcogen, Disordered, Lanthanoid, Rare earth, Cu-La-O-Sr, Seebeck coefficient, Tetragonal. *Cu-La-O-Sm-Sr ...
Rechargeable aqueous zinc-chalcogen batteries have become a rising star in the energy storage systems due to the high abundance ... As a cathode for aqueous zinc-chalcogen batteries, HMCs-3@S delivers a high reversible discharge capacity (591 mAh g−1 at 0.1 A ... Highly Microporous Carbon from Enteromorpha for High‐Performance Aqueous Zinc‐chalcogen (S, SeS2) Batteries. ... was synthesized as a sulfur-loaded cathode for aqueous zinc-chalcogen batteries. A high specific surface area (3349.4 m2 g−1) ...
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chalcogen oxoacid. 12916. sulfur oxoacid. 12654. sulfonic acid. 10056. sulfonic acid derivative. 10056. ...
MeSH Terms: Animals; Brain/drug effects*; Brain/enzymology; Chalcogens/toxicity*; Electron Transport Complex I/antagonists & ...
Structure of Cu Ions in (Cu+Halogen or Chalcogen)-Ion Implanted Silica Glasses. Author(s):. Fukumi, Kohei. ...
We also include examples of the conceptually similar conversion-type reactions involving chalcogens and halogens, with emphasis ...
Chalcogens Preferred Concept UI. M0027193. Registry Number. 0. Scope Note. The elements OXYGEN; POLONIUM; SELENIUM; SULFUR; and ... Chalcogens Preferred Term Term UI T053841. Date01/01/1999. LexicalTag NON. ThesaurusID NLM (1994). ... Chalcogens. Tree Number(s). D01.268.185. Unique ID. D018011. RDF Unique Identifier. http://id.nlm.nih.gov/mesh/D018011 ...
Synthesis, properties, and photodynamic properties in vitro of heavy-chalcogen analogues of tetramethylrosamine.. Detty MR; ...
Chalcogens. Where Have All The Pixels Gone?. Sound Coder. Quebarium. xSqueeker. Graz. Lasertime. ... Chalcogens is a demo for Gamepark’s GP2x by Quebarium, Desire & TRSI. Released at Recursion 2012, it ranked first in the ...
An organochalcogen compound is a compound containing at least one carbon-chalcogen bond.. http://purl.obolibrary.org/obo/chebi. ...
CVD the morphology of islands can be controlled to a degree by altering the local ratio of the transition metal and chalcogen ...
Chalcogens,N0000007935, Piracetam,N0000007934, Chromones,N0000007933, Cytosine,N0000007932, aldesleukin,N0000006812, Tedelparin ...
Automated identification of chalcogen bonds in AlphaFold protein structure database files: is it possible? Carugo O, Djinović- ...
Chalcogens - Preferred Concept UI. M0027193. Scope note. The elements OXYGEN; POLONIUM; SELENIUM; SULFUR; and TELLURIUM; that ...
Chalcogens Preferred Concept UI. M0027193. Registry Number. 0. Scope Note. The elements OXYGEN; POLONIUM; SELENIUM; SULFUR; and ... Chalcogens Preferred Term Term UI T053841. Date01/01/1999. LexicalTag NON. ThesaurusID NLM (1994). ... Chalcogens. Tree Number(s). D01.268.185. Unique ID. D018011. RDF Unique Identifier. http://id.nlm.nih.gov/mesh/D018011 ...
It is a member of the chalcogen group and the periodic table. Oxygen gas is found mainly in the atmosphere. It helps organisms ...
The research team created carbon impurity defects at chalcogen sites using scanning tunneling microscopy (STM)-induced hydrogen ...
All together, these three bonds compose a total interaction energy between 5.4 and 16.8 kcal/mol, with the larger chalcogen ... of the Se atoms by S and Te analogues allows analysis of the dependence of these forces on the nature of the chalcogen atom. ... The binding motif involves a pair of Se···N chalcogen bonds, with a supplementary N···N pnicogen bond. Quantum calculations ... Experimental and Theoretical Studies of Dimers Stabilized by Two Chalcogen Bonds in the Presence of a N···N Pnicogen Bond. The ...
All three elements have a high affinity for the chalcogens and are usually found as the sulfide ores (M2S3), often in ... elemental nitrogen does not react with the halogens or the other chalcogens. Nonetheless, all the binary nitrogen halides (NX3 ... Chalcogens) : property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+,,c__DisplayClass228_0., ...
3GE Collection on Chemistry: Chalcogen Chemistry. * 3GE Collection on Chemistry: Polymer Nanocomposites for Energy Applications ...
The chalcogen is in an -OH, -SH, -OM or -SM group (M is Group IA or Group IIA light metal) (Class 546/179) ... Chalcogen attached directly to the carbocyclic ring of the quinoline ring system by nonionic bonding (Class 546/178) ... The -C(=X)- is part of a -C(=X)X- group, wherein the Xs are the same or diverse chalcogens (Class 546/170) ... Chalcogen attached directly to the carbocyclic ring of the quinoline ring system by nonionic bonding (Class 546/177) ...
Characterization of ZnE (E=S,Se, or Te) materials synthesized using silylated chalcogen reagents in mesoporous MCM-41. Turner, ...
We take CuMoP$_{2}$S$_{6}$ monolayer as an example, which is a member of the large 2D transition-metal chalcogen-phosphates ...
The roles of chalcogen atomic defects in engineering TMDs for improvements to the hydrogen evolution reaction (HER) are ...
Chemistry of Chalcogens. *Chemistry of Nitrogen-Containing Heterocyclic Compounds. *Color Chemistry. *Modern Chromatographic ...
  • The research team created carbon impurity defects at chalcogen sites using scanning tunneling microscopy (STM)-induced hydrogen desorption from carbon-hydrogen complexes in WS 2 and WSe 2 , generating a carbon radical ion in WS 2 with a net magnetic moment of 1 µB. (lbl.gov)
  • The roles of chalcogen atomic defects in engineering TMDs for improvements to the hydrogen evolution reaction (HER) are summarized. (ntu.edu.sg)
  • All together, these three bonds compose a total interaction energy between 5.4 and 16.8 kcal/mol, with the larger chalcogen atom associated with the strongest interactions. (usu.edu)
  • In this work, for the first time, nitrogen-doped highly microporous biomass-derived carbon (HMCs-3) was synthesized as a sulfur-loaded cathode for aqueous zinc-chalcogen batteries. (gdch.app)
  • The excellent performance of this biomass-derived carbon holds great promise for practical applications in aqueous zinc-chalcogen batteries. (gdch.app)
  • Replacement of the Se atoms by S and Te analogues allows analysis of the dependence of these forces on the nature of the chalcogen atom. (usu.edu)
  • The binding motif involves a pair of Se···N chalcogen bonds, with a supplementary N···N pnicogen bond. (usu.edu)