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1988 (1)
1985 (1)
1983 (2)
1Author    Ralf Steudel, Torsten Sandow, Jürgen SteidelRequires cookie*
 Title    Darstellung und Eigenschaften von cyclo-Nonaschwefeloxid (S 9 0) und von cjc/o-Dekaschwefeloxid (Si 0 O) [1]  
 Abstract    Preparation and Properties of cyc/o-Nonasulfuroxide (S 9 0) and of cyc/o-Decasulfuroxide (S 10 O) [1] The homocyclic oxides S 9 0 (m.p. 33 °C, dec.) and S 10 O (m.p. 51 °C, dec.) have been prepared by oxidation of the corresponding sulfur rings S 9 and S 10 , respectively, by trifluoroperoxy acetic acid (molar ratio 1:2—3) in a carbon disulfide/methylene chloride mixture. According to infrared and Raman spectra, both compounds contain an exocyclic oxygen atom. S 9 0 and S 10 O decompose at 25 °C to give S0 2 and a polysulfuroxide S n O with «>10 but both can be stored at —78 °C without decomposition. The SS bond distances are discussed on the basis of the Raman spectra. In addition, the Raman spectrum of solid S 9 has been recorded for the first time. It shows that S 9 crystallizes as two allotropes (a-and ß-S g) both consisting of cyclic molecules of either Q or C 2 symmetry with bond distances of between 203 and 209 pm. 
  Reference    Z. Naturforsch. 40b, 594—600 (1985); eingegangen am 5. November 1984 
  Published    1985 
  Keywords    Sulfur Rings, Sulfur Oxides, Raman Spectra 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0594.pdf 
 Identifier    ZNB-1985-40b-0594 
 Volume    40 
2Author    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 
3Author    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 
4Author    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