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1990 (1)
1988 (1)
1983 (1)
1Author    Ralf Steudel, Eva-Maria StraussRequires cookie*
 Title    Chromatographische Trennung schwefelhaltiger Heterocyclen der Typen (CH2)nSM und Se"S8_m mittels HPLC [1] Chromatographie Separation of Sulfur Containing Heterocycles of Type (CH2)"Sm and SenS8_n by HPLC [1]  
 Abstract    The Separation of a number of cyclic methylene sulfides and selenides by reversed-phase high-pressure liquid chromatography is reported. The retention times as well as the capacity factors depend in a systematic way on the ring size, the number and kind of chalcogen atoms, and the number of heteronuclear bonds within the ring. These relation-ships are used to assign the chromatograms of cyclic selenium sulfides of type SeraS8-n (n = 1-8) prepared in a new reaction from Se2Cl2, SC12 and potassium iodide and containing all selenium atoms in neighboring positions. 
  Reference    Z. Naturforsch. 38b, 719—725 (1983); eingegangen am 9. Februar 1983 
  Published    1983 
  Keywords    HPLC, Methylene Sulfides, Methylene Selenides, Selenium Sulfides, Sulfur Heterocycles 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0719.pdf 
 Identifier    ZNB-1983-38b-0719 
 Volume    38 
2Author    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 
3Author    R. Alf Steudel, Eva-M Aria, Strauss, Detlef JensenRequires cookie*
 Title    The Retention of Six-, Seven-, Eight-, and Twelve-Membered Ring Molecules of Type SexS v in Reversed-Phase HPLC. Prediction of Retention for Unknown Se^S^. Heterocycles and Analysis of Sulfur-Selenium Melts [1]  
 Abstract    The HPLC retention times o f 25 cyclic com pounds o f type SevSv (x = 0 8; y = 0 12) have been measured under identical conditions and are used to evaluate the factors which determine the retention. Linear relationships are derived for the dependence o f retention (Ink'-, k' = capacity factor) on ring size, number o f Se atoms, and number o f SeS bonds per molecule for six-, seven-, eight-, and twelve-membered SevSv rings. These relationships allow the prediction o f retention times for all SeY S t. heterocycles o f these ring sizes (ca. 100 com pounds). The results are applied to the qualitative analysis o f mixed sulfur-selenium melts o f two com positions: at a molar ratio o f S : Se = 8.7 twenty-one HPLC signals have been observed for the CS2 extract o f the quenched melt and assigned to SevSv rings o f sizes 6 • • • 12. At S :S e = 0.33 mainly six-, seven-, and eight-membered species with cumulated Se atom s have been found. 
  Reference    Z. Naturforsch. 45b, 1282—2 (1990); received March 19 1990 
  Published    1990 
  Keywords    HPLC, Selenium Sulfides, Retention-Structure R elationship, Retention Indices, Sulfur-Selenium Melts 
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 TEI-XML for    default:Reihe_B/45/ZNB-1990-45b-1282.pdf 
 Identifier    ZNB-1990-45b-1282 
 Volume    45