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'Elemental Sulfur' in keywords
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1988 (3)
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1Author    Eva-Maria Strauss, Ralf SteudelRequires cookie*
 Title    Photolyse von elementarem Schwefel (S 6 , S 7 , S 8 , S 10 , S 12 ) in Kohlenstoffdisulfidlösung [1]  
 Abstract    The photochemical decomposition of pure carbondisulfide as well as of solutions of pure S 6 , S 7 , S 8 , S I0 and S 12 , respectively, in CS 2 at 15 °C on irradiation by a high-pressure mercury lamp (200-600 nm) has been studied by quantitative HPLC analysis of the soluble products. In all cases mixtures of sulfur homocycles S" (n = 5,6, ...) are formed with S 8 , S 7 and S 6 being the dominating species, but traces of S 5 , S 9 , S 10 and S 12 have also been observed in most cases. S 5 has been identified for the first time; it is formed in particular in the photolysis of S 7 in CS 2 . All irradiated sulfur solutions reach more or less the same photostationary equilibrium, but the decomposition of CS 2 increases linearly with time and its effects are superimposed on the S" interconversion reactions. 
  Reference    Z. Naturforsch. 42b, 682—690 (1987); eingegangen am 20. Februar 1987 
  Published    1987 
  Keywords    Elemental Sulfur, Photolysis, HPLC, Carbondisulfide, Sulfur Homocycles 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0682.pdf 
 Identifier    ZNB-1987-42b-0682 
 Volume    42 
2Author    Ralf Steudel, Birger HolzRequires cookie*
 Title    S-Isotopenaustausch zwischen flüssigem Kohlenstoffdisulfid und elementarem Schwefel [1] Sulfur-34 Isotopic Exchange between Liquid Carbondisulfide and Elemental Sulfur [1]  
 Abstract    The exchange of sulfur isotopes between liquid carbondisulfide and dissolved elemental sulfur-34 (S 6 , S 7 , S 8 , S 9 , S 10 , S 12) was studied by Raman spectroscopy. No exchange was observed within 4 h at temperatures below 200 °C. Prolonged heating to 200 °C results in a slow exchange (half-life >300 h) as observed by the intensity increase of the symmetric stretching vibration of C 32 S 34 S measured at -120 °C. 
  Reference    Z. Naturforsch. 42b, 691—694 (1987); eingegangen am 26. Januar 1987 
  Published    1987 
  Keywords    Isotopic Exchange, Sulfur-34, Carbondisulfide, Elemental Sulfur 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0691.pdf 
 Identifier    ZNB-1987-42b-0691 
 Volume    42 
3Author    Reinhard Strauss, Ralf SteudelRequires cookie*
 Title    Darstellung von Cyclopentadekaschwefel (S 15 ) aus Titanocenpentasulfid und Sulfurylchlorid [1] Synthesis of Cyclopentadecasulfur (S 15 ) from Titanocene Pentasulfide and Sulfuryl Chloride [1]  
 Abstract    Titanocene pentasulfide reacts with sulfuryl chloride under suitable conditions to give a mixture of mainly S 10 , S 15 , and S 2 n which can be separated by repeated crystallization and precipitation. Pure S, 5 is obtained as a lemon-yellow powder at low temperatures which transforms to a sticky mass at 20 °C. Solutions of S 15 in CS 2 are stable at 20 °C for months. Pure S 15 does not decompose at 20 °C within a few hours. Raman spectra of S 15 show stretching vibrations at 409—480 cm" 1 and bending and torsional modes at < 270 cm H . 
  Reference    Z. Naturforsch. 43b, 1151—1155 (1988); eingegangen am 20. Mai 1988 
  Published    1988 
  Keywords    Elemental Sulfur, Raman Spectra, HPLC, Sulfur Rings 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-1151.pdf 
 Identifier    ZNB-1988-43b-1151 
 Volume    43 
4Author    Ralf Steudel, Jürgen Steidel, Richard ReinhardtRequires cookie*
 Title    X-Ray Structural Analyses of Cyclodecasulfur (S10) and of a Cyclohexasulfur-Cyclodecasulfur Molecular Addition Compound (S6 * S10) [1]  
 Abstract    Low temperature X-ray structural analyses of monoclinic single crystals of Sio and Sö • Sio (prepared from the components) show that the cyclic Sio molecule exhibits the same D2 conformation in both compounds with bond distances between 203.3 and 208.0pm, bond angles (a) between 103 and 111°, and torsional angles (r) between 73 and 124°. The Sß molecule (site symmetry Ci) in Sö • Sio is very similar to the one in pure Sö (dss = 206.2 pm, a= 103°, r = 74°). All intermolecular interactions are of van-der-Waals type. The Raman spectrum of S6 • Sio can be explained by a superposition of the Se and Sio spectra. 
  Reference    Z. Naturforsch. 38b, 1548—1556 (1983); received August 11 1983 
  Published    1983 
  Keywords    Elemental Sulfur, Sulfur Rings, Molecular Structure, Crystal Structure, Vibrational Spectra 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1548.pdf 
 Identifier    ZNB-1983-38b-1548 
 Volume    38 
5Author    Ralf Steudel, Thomas Göbel, Gabriele HoldtRequires cookie*
 Title    The Molecular Composition of Hydrophilic Sulfur Sols Prepared by Acid Decomposition of Thiosulfate [1]  
 Abstract    Hydrophilic sulfur sols prepared from sodium thiosulfate and concentrated sulfuric acid and purified by repeated NaCl precipitation and peptization in water have been studied by chemical analysis, vibrational spectroscopy, ion-pair chromatography and reversed-phase HPLC. The composition of the sol is Na 164 S 28 . 6 0 6 • 5.9In S" • 1.0 NaCl. The elemental sulfur S" (n = 6-14; mainly S 8) accounts for 17% the total sulfur; 83% of the S are present as long-chain polythionates which form micelles in which the S" molecules are dissolved. On aging of the sol at 20 °C the polythionate micelles decompose to give water-soluble short-chain polythionates and elemental sulfur which precipitates from the solution. The micelle structure of hydrophilic sulfur sols may serve as a model for the so-called sulfur globules (S°) formed intra-or extracellularly by many sulfur bacteria which oxidize reduced sulfur compounds to S°. — Infrared and Raman spectra of K 2 S m 0 6 (m = 3—6) are reported. The photodecomposition of aqueous tetrathionate yields sulfite, thiosulfate, and polythionates with up to 9 sulfur atoms. 
  Reference    Z. Naturforsch. 43b, 203—218 (1988); received August 3 1987 
  Published    1988 
  Keywords    Sulfur Sol, Polythionates, Elemental Sulfur, Thiosulfate Decomposition, Sulfur Bacteria 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-0203.pdf 
 Identifier    ZNB-1988-43b-0203 
 Volume    43 
6Author    Ralf Steudel, Maria Papavassiliou, Detlef Jensen, Konrad SeppeltRequires cookie*
 Title    Spectroscopic Evidence for Pseudorotation of Seven-Membered Chalcogen Rings in Solution [1]  
 Abstract    The 77 Se NMR spectrum of l,2-Se2S5 exhibits one singlet at 1077.3 ppm indicating pseudorotation in solution; the same conclusion is reached from the solution Raman spectrum of S7 showing characteris-tic line broadening compared to the solid state spec-trum. 
  Reference    Z. Naturforsch. 43b, 245—247 (1988); received October 7/October 12 1987 
  Published    1988 
  Keywords    77 Se NMR Spectra, Raman Spectra, Elemental Sulfur, Selenium Sulfides 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-0245_n.pdf 
 Identifier    ZNB-1988-43b-0245_n 
 Volume    43 
7Author    Z. NaturforschRequires cookie*
 Title      
  Reference    Z. Naturforsch. 34b, 451—455 (1979); eingegangen am 15. November 1978 
  Published    1979 
  Keywords    Nickel(II)-tetrasulfido Complexes, Platinum(II)-tetrasulfido Complexes, Elemental Sulfur, Sodium Polysulfides, Synthesis 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0451.pdf 
 Identifier    ZNB-1979-34b-0451 
 Volume    34 
8Author    Ralf SteudelRequires cookie*
 Title    Barrier to Rotation about Sulfur-Sulfur Bonds in Homocyclic Sulfur Molecules [1]  
 Abstract    It is shown that the distances (d) of the 19 longest bonds in 9 homocyclic sulfur rings of type Sn (n = 6-20) depend on the torsional angles (r) which vary between 0° and 140°. The function d = f (r) is smallest for r = 90-100° and largest for r = 0°; the corresponding bond distance variation amounts to 13 pm or 6%. The height of the torsional cis-barrier is estimated from the enthalpy of formation of gaseous S7 as equal to or smaller than 24 kJ/mol. 
  Reference    Z. Naturforsch. 38b, 543—545 (1983); received January 18 1983 
  Published    1983 
  Keywords    Elemental Sulfur, Sulfur Rings, Sulfur-Sulfur Bonds, Torsional Barrier, Bond Distances 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0543.pdf 
 Identifier    ZNB-1983-38b-0543 
 Volume    38