ZfN: Search Results

1	Author	Reinhard Strauss, Ralf Steudel	Requires 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

2	Author	Ralf Steudel, Thomas Göbel, Gabriele Holdt	Requires 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

3	Author	Ralf Steudel, Maria Papavassiliou, Detlef Jensen, Konrad Seppelt	Requires 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