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  • 1
    Electronic Resource
    Electronic Resource
    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
    Keywords: Chromatium vinosum ; Phototrophic bacteria ; Polysulfides ; Polythionates ; Elemental sulfur ; Sulfur globules ; Ion chromatography ; HPLC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00248423
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  • 2
    Electronic Resource
    Electronic Resource
    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
    Keywords: Sulfur ; Sulfanes ; Acidity ; Ab initio MO calculations ; Hyperconjugation ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    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
    Keywords: Sulfur ; Titanium ; Zinc ; Polysulfido complexes ; Sulfur heterocycles ; Polysulfides ; Polysulfanes ; Sulfenyl chlorides ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Sulfur Compounds. 164 Thermal Polymerization of the Cyclic Seleniumsulfide 1,2-Se2S5 Studied by DSC, HPLC, Raman Spectroscopy, and X-Ray Diffraction (1993)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 1589-1596 
    Details
    ISSN: 0044-2313
    Keywords: Seleniumsulfides ; thermal polymerization ; DSC ; HPLC ; Raman spectroscopy ; X-ray diffraction ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Schwefelverbindungen. 164. Thermische Polymerisation des cyclischen Selensulfids 1,2-Se2S5 - eine Untersuchung mittels DSC, HPLC, Ramanspektroskopie und RöntgenbeugungKristallines 1,2-Se2S5 polymerisiert bei 47°C endotherm zu einem kettenförmigen Polymer, das nach Streckung und Extraktion aus helicalen Molekülen ähnlich denen im polymeren Schwefel besteht. Beim Erhitzen zersetzt sich das Polymer bei 84°C exotherm zu einer Mischung aus sieben cyclischen SenS8-n-Molekülen; diese Mischung schmilzt bei 111°C. Wenn das polymere Se2S5 mit CS2 gekocht wird, enstehen primär 1,2-Se2S5, SeS5 und 1,2,3-Se3S5, aber zusätzlich werden SeS7 und 1,2-Se2S6 beobachtet.Diese Ergebnisse sprechen für die Atomfolge -Se—S5—Se- in dem Polymer, dessen Pulverdiagramm, Gitterkonstanten und Ramanspektrum mitgeteilt werden.
    Notes: Solid 1,2-Se2S5 polymerizes endothermically at 47°C to give a linear polymer which after stretching and extraction consists of helical molecules similar to those of polymeric sulfur. Heating of the polymer results in slow exothermic depolymerization at 84°C to give a mixture of seven cyclic SenS8-n molecules which melts at 111°C. When the polymeric Se2S5 is refluxed with CS2 the initial depolymerization Products are 1,2-Se2S5, SeS5 and 1,2,3-Se3S5 but in addition SeS7 and 1,2-Se2S6 are formed. These results indicate the atomic sequence -Se—S5—Se- in the polymer. The powder x-ray diffraction pattern and Raman spectrum of the polymer as well as its lattice parameters are reported and the Probable mechanism of its depolymerization is discussed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19936190914
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  • 5
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of Dicyanotetrasulfane S4(CN)2 (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 117-120 
    Details
    ISSN: 0044-2313
    Keywords: X-ray crystallography ; sulfur-sulfur bonds ; tetra-sulfides ; dicyanosulfanes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Kristall- und Molekülstruktur von Dicyanotetrasulfan S4(CN)2S4(CN)2 kristallisiert in der monoklinen Raumgruppe P21/c mit den im Abstract angegebenen Parametern. Die Moleküle besetzen allgemeine Lagen, sind aber ungefähr von C2-Symmetrie. Die Konformation ist all-trans mit den Torsionswinkeln CSSS = 74,6° und 81,7° sowie SSSS = 84,8°. Die mittlere SS-Bindung (201,7 pm) ist viel kürzer als die äußeren (Mittelwert 206,8 pm). Die intermolekularen Wechselwirkungen sind vom van-der-Waals-Typ.
    Notes: S4(CN)2 crystallizes in the monoclinic space group P21/c with a = 885.7 pm, b = 794.2 pm, c = 1032.6 pm, β = 109.0° (at 173 K). The molecules occupy general sites but are of approximate C2 symmetry. The conformation of the molecules is all-trans with torsional angles CSSS = 74.6° and 81.7° and SSSS = 84.8°. The central SS bond (201.7 pm) is much shorter than the terminal SS bonds (av. 206.8 pm). There are no stronger than van-der-Waals type intermolecular interactions.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200119
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  • 6
    Electronic Resource
    Electronic Resource
    Preparation and X-Ray structural analysis of the remarkably stable Bis(triphenylmethyl)trisulfane-2-oxide R2S3O (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1672-1676 
    Details
    ISSN: 0044-2313
    Keywords: X-ray crystallography ; dithiosulfite ; vibrational spectra ; sulfane oxide ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Darstellung und Röntgenstrukturanalyse des bemerkenswert stabilen Bis(triphenylmethyl)trisulfan-2-oxids R2S3O [1]Triphenylmethylthiol reagiert in Gegenwart von Aminen mit Thionylchlorid zu [(C6H5)3CS]2SO, das als Solvat mit 1 Mol CS2 kristallisiert: triklin, Raumgruppe P1 mit a = 1 193,4(4), b = 1 266,8(5), c = 1 421,6(7) pm, α = 63,79(2)°, β = 65,25(2)°, γ = 63,18(2)α, ρ = 1,354 g cm-3 bei -80°C. Das Trisulfanoxidmolekül R2S3O ist von C1-Symmetrie und weist ein fast planares Gerüst CSSSC auf mit den im Abstract angegebenen geometrischen Parametern.
    Notes: Triphenylmethylthiol reacts with thionylchloride in the presence of amines to give [(C6H5)3CS]2SO which crystallizes with one mole of CS2 in the triclinic space group P1 with a = 1 193.4(4), b = 1 266.8(5), c = 1 421.6(7) pm, α = 63.79(2)°, β = 65.25(2)°, γ = 63.18(2)°, π = 1.354 g cm-3 at -80°C. The R2S3O molecules are of C1 symmetry containing an almost planar CSSSC backbone with dss = 212.7(1) and 211.4(1) pm, dcs = 188.0(2) and 188.2(2) pm, dso = 146.9(1) pm, αSSS = 83.8°, αSSO = 112.0° and 112.2°, τCSSS = 160.7° and -172.3°.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956211010
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  • 7
    Electronic Resource
    Electronic Resource
    Properties of Sulfur-Sulfur BondsBased on lectures in Hoechst AG. Frankfurt/Main (Nov. 7, 74) at the Technical University Berlin (Dec. 2, 74) and at the Universities of Marburg (Jan. 6, 75). Heidelberg (Feb. 3, 75). Würzburg (Feb. 17, 75), Erlangen-Nürnberg (Feb. 18, 75), and Düsseldorf (April 9, 75, Chemiedozententagung).Dedicated to Professor Richard C. Lord on the occasion of his 65th birthday (1975)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 14 (1975), S. 655-664 
    Details
    ISSN: 0570-0833
    Keywords: Sulfur ; Bond theory ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: SS bonds are extraordinarily flexible and have properties that are observed only on isolated occasions for other homonuclear bonds: the bond lengths very between 1.8 and 3.0Å, the bond angles between 90 and 180° and the dihedral angles between 0 and 180°; the bond energies amount to up to 430 kJ/mol. The SS stretching frequencies can appear over the range 177-820 cm-1 and force constants of 1.4 to 6.3 mdyne/Å have been calculated. This variability is illustrated with examples containing isolated and cumulated SS bonds.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.197506551
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