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  • Digitale Medien  (8)
  • Acidity  (2)
  • Polysulfanes  (2)
  • Polysulfides  (2)
  • Polythionates  (2)
  • Strukturaufklärung  (2)
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  • Digitale Medien  (8)
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  • 1
    Digitale Medien
    Digitale Medien
    Search for polythionates in cultures of Chromatium vinosum after sulfide incubation (1990)
    Springer
    Archives of microbiology 153 (1990), S. 432-437 
    Details
    ISSN: 1432-072X
    Schlagwort(e): Chromatium vinosum ; Phototrophic bacteria ; Polysulfides ; Polythionates ; Elemental sulfur ; Sulfur globules ; Ion chromatography ; HPLC
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Cultures of Chromatium vinosum, devoid of sulfur globules, were supplemented with sulfide and incubated under anoxic conditions in the light. The concentrations of sulfide, polysulfides, thiosulfate, polythionates and elemental sulfur (sulfur rings) were monitored for 3 days by ion-chromatography and reversed-phase HPLC. While sulfide disappeared rapidly, thiosulfate and elemental sulfur (S6, S7 S8 rings) were formed. After sulfide depletion, the concentration of thiosulfate decreased fairly rapidly, but elemental sulfur was oxidized very slowly to sulfate. Neither polysulfides (S x 2− ), polythionates (SnO 6 2− , n=4–6), nor other polysulfur compounds could be detected, which is in accordance with the fact that sulfide-grown cells were able to oxidize polysulfide without lag. The nature of the intracellular sulfur globules is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00248423
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  • 2
    Digitale Medien
    Digitale Medien
    Thiosulfate and tetrathionate degradation as well as biofilm generation by Thiobacillus intermedius and Thiobacillus versutus studied by microcalorimetry, HPLC, and ion-pair chromatography (1994)
    Springer
    Archives of microbiology 161 (1994), S. 116-125 
    Details
    ISSN: 1432-072X
    Schlagwort(e): Thiobacillus intermedius ; Thiobacillus versutus ; Thiosulfate ; Polythionates ; Ion-pair chromatography ; Microcalorimetry ; Biofilm
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The growth of Thiobacillus (T.) intermedius strain K12 and Thiobacillus versutus strain DSM 582 on thiosulfate and tetrathionate was studied combining on-line measurements of metabolic activity and sulfur compound analysis. Most results indicate that T. intermedius oxidized thiosulfate via tetrathionate to sulfate. Concomittantly, sulfur compound intermediates like triand pentathionate were detectable. The formation is probably the result of highly reactive sulfane monosulfonic acids. The formation of tetrathionate allows the cells to buffer temporarily the proton excretion from sulfuric acid production. With T. versutus intermediate sulfur compounds were not detectable, however, sulfur was detectable. The possibility of a thiosulfate oxidation via dithionate, S2O inf6 sup2- , is discussed. The on-line measurement of metabolic activity by microcalorimetry enabled us to detect that cells of T. intermedius adhere to surfaces and produce a biofilm by a metabolic process whereas those of T. versutus fail to do so. The importance of the finding is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00276471
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  • 3
    Digitale Medien
    Digitale Medien
    Gas-Phase Acidities of Nine Sulfur Oxoacids of Composition [H2,S,On] (n = 1-4) (2000)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 2000 (2000), S. 617-624 
    Details
    ISSN: 1434-1948
    Schlagwort(e): Sulfur oxo acids ; Acidity ; Ab initio calculations ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The gas-phase acidities of the most stable conformations of nine sulfur oxo acids were determined by ab initio MO calculations at the CBS-Q, G2(MP2), and G2 levels of theory. The most accurate G2 results are as follows (ΔG°298 of the deprotonation reaction in kJ mol-1): H-S-O-H 1468, H-S-O-H 1449, (HO)2S 1426, H-S(=O)OH 1406, H2S/O 1394, H-S(=O)OH 1361, (HO)2S/O 1324, H2S(=O)2 1321, H2O→S 1294, H-S(=O)2OH 1287, H-S(=O)2OH 1279, (HO)2S(=O)2 1268. These values are in excellent agreement with the few experimental data that can be considered reliable. For molecules of analogous structure, the acidity increases with increasing oxidation number of the sulfur atom. While sulfenic acid, HSOH, is as weak an acid as HOCl, sulfurous acid, (HO)2SO, is as strong a proton donor as nitric acid, HNO3, and sulfonic acid, HS(O)2OH, is even stronger than hydrogen iodide, HI, surpassed only by sulfuric acid, H2SO4. These results are of relevance to phenomena such as acid rain and aerosol formation in the earth′s atmosphere.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 4
    Digitale Medien
    Digitale Medien
    The Gas Phase Acidities of the Sulfanes H2Sn (n = 1-4) (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 2057-2061 
    Details
    ISSN: 1434-1948
    Schlagwort(e): Sulfur ; Sulfanes ; Acidity ; Ab initio MO calculations ; Hyperconjugation ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The gas-phase acidities ΔGacid(298 K) of the sulfanes H2Sn (n = 1-4) have been calculated by ab initio molecular orbital theory using the G2 and G2(MP2) methods, which were applied to the geometries of lowest energy. The results show that the higher sulfanes are surprisingly strong proton donors. The acidities (in kJ mol-1) are as follows: H2S (1444), H2S2 (1406), H2S3 (1370), H2S4 (1347). The latter three values may be compared to those of other strong Brønsted acids like gaseous HNO2 (1396), HCl (1371), and HBr (1332). The monoanions HSn- exhibit an interesting bond length distribution as a consequence of the charge delocalization by hyperconjugation, which in turn may be responsible for the high acidities of the sulfanes.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 5
    Digitale Medien
    Digitale Medien
    Preparation of Organic Polysulfanes R2Sn (n = 5, 7, 8, 9) from Sulfenyl Chlorides, RSCl, and Transition Metal Polysulfido Complexes (2000)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 2000 (2000), S. 921-928 
    Details
    ISSN: 1434-1948
    Schlagwort(e): Sulfur ; Titanium ; Zinc ; Polysulfido complexes ; Sulfur heterocycles ; Polysulfides ; Polysulfanes ; Sulfenyl chlorides ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The preparation of seven novel organic polysulfanes is reported. Bis(n-octyl)heptasulfane R2S7 1 is formed upon reaction of RSCl with [Cp2TiS5], while the corresponding nonasulfane R2S9 2 is obtained by reaction of RSSCl with [Cp2TiS5]. The bis(n-octyl)pentasulfane R2S5 3 is obtained from RSCl and [(Cp′2TiCl)2S3] by transfer of the S3 ligand at 20 °C. The new alkyl polysulfanes 1-3 have been obtained in quantitative yields. They are liquids at 20 °C, having freezing points below -50 °C, but do not form mesogenic phases. Reactions of [Cp2TiS5] with 2-naphthyl- and 4-chlorophenyl sulfenyl chloride furnish the corresponding heptasulfanes 4 and 5, respectively, which are solids at 20 °C. 1,2-Benzodisulfenyl chloride C6H4(SCl)2 reacts with [(Cp′2TiCl)2S3] to give the known 1,2,3,4,5-benzopentathiepin C6H4S5 6, with [Cp2TiS5] to give the novel 1,2,3,4,5,6,7-benzoheptathionin C6H4S7 7, and with [(TMEDA)ZnS6] to give the novel 1,2,3,4,5,6,7,8-benzooctathiecin C6H4S8 8. The cyclic polysulfanes 6-8 are solids at 20 °C and have been recovered in yields of 60-83%. The orthorhombic structure of 1,2-C6H4S7 has been investigated by single-crystal X-ray diffraction analysis. The molecules are found to be located at sites of Cs symmetry and the motif of the C2S7 heterocycle is +-+-+-+-, with the torsion angle of zero at the carbon-carbon bond. The three internuclear SS distances measure 205.0(1), 203.7(1), and 205.7(1) pm.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    Große Schwefel-Stickstoff-Heterocyclen: Synthese der Schwefelimide SnNH (n = 8, 9, 11) und Strukturen von S8NH und S9NHSchwefelverbindungen, 196. Mitteilung. Diese Arbeit wurde von der Deutschen Forschungsgemeinschaft, dem Deutschen Akademischen Austauschdienst und dem Fonds der Chemischen Industrie unterstützt. 195. Mitteilung: Lit. [1]. (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 108 (1996), S. 2641-2643 
    Details
    ISSN: 0044-8249
    Schlagwort(e): Schwefelverbindungen ; Stickstoffverbindungen ; Strukturaufklärung ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/ange.19961082111
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  • 7
    Digitale Medien
    Digitale Medien
    Schwefelsäure aus Schwefeltrioxid und Wasser - eine überraschend komplexe ReaktionSchwefelverbindungen, 189. Mitteilung. Für die Anfertigung der Abb. 1-4 danke ich Frau Dr. Yana Drozdova. 188. Mitteilung: M. Pridöhl, R. Steudel, J. Buschmann, P. Luger, Z. Anorg. Allg. Chem., im Druck. (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 107 (1995), S. 1433-1435 
    Details
    ISSN: 0044-8249
    Schlagwort(e): Atmosphärenchemie ; Schwefelsäure ; Schwefelverbindungen ; Strukturaufklärung ; Wasserstoffbrücken ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/ange.19951071206
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  • 8
    Digitale Medien
    Digitale Medien
    Crystal and Molecular Structures as well as Spectra of Two Organic Tetrasulfanes R2S4 (R = 2-benzothiazolyl and 4-chlorophenyl) (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1021-1024 
    Details
    ISSN: 0044-2313
    Schlagwort(e): Polysulfanes ; structure ; spectra ; preparation ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Kristall- und Molekülstrukturen sowie Spektren zweier organischer Tetrasulfane R2S4 (R = 2-Benzothiazolyl und 4-Chlorphenyl)Bis(2-benzothiazolyl)tetrasulfan, hergestellt aus dem Mercaptan und S2Cl2, kristallisiert in der monoklinen Raumgruppe C2/c mit den im Abstract angegebenen Zelldimensionen. Die Moleküle haben C2-Symmetrie; das S4-Gerüst ist von all-trans-Konformation mit den Parametern dss = 202,7 (terminal) und 207,3 pm (zentral), αsss = 106,4° und τssss = 78,5°. Bis(4-chlorphenyl)tetrasulfan kristallisiert in der monoklinen Raumgruppe P21/a (s. Abstract). Die Moleküle befinden sich in allgemeinen Lagen, sind aber näherungsweise von C2-Symmetrie und ebenfalls von all-trans-Konformation mit dss = 203,6 (terminal), 206,7 (zentral) und 202,3 pm (terminal), αsss = 107,4° und 108,4° sowie τssss = 75,5°. Die intermolekularen Wechselwirkungen sind vom van der Waals-Typ. Infrarot-, Raman-, Massen- und NMR-Spektren (1H, 13C) der Verbindungen werden mitgeteilt.
    Notizen: Bis(2-benzothiazolyl)tetrasulfane prepared from the mercaptane and S2Cl2 crystallizes in the monoclinic space group C2/c with a = 3513 pm, b = 577.28 pm, c = 800.0 pm, β = 98.74°, ρ = 1.64 g cm-3 (at 298 K). The molecules are of C2 symmetry with the geometrical parameters of the S4 backbone: dss = 202.7 (terminal) and 207.3 pm (central), αsss = 106.4°, τssss = 78.5°. The overall conformation is all-trans.Bis(4-chlorophenyl)tetrasulfane prepared from the mercaptane and diisopropoxydisulfane crystallizes in the monoclinic space group P21/a with a = 1237.7 pm, b = 748.4 pm, c = 1623.9 pm, β = 105.58°, ρ = 1.61 g cm-3 (at 298 K). The molecules occupy general positions but are approximately of C2 symmetry with dss = 203.6 (terminal), 206.7 (central) and 202.3 pm (terminal), αsss = 107.4° and 108.4°, τssss = 75.5° (all-trans conformation). The intermolecular interactions are of van der Waals type. Infrared, Raman, mass and NMR spectra (1H, 13C) are reported.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/zaac.19956210621
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