ZfN: Search Results

1	Author	Ralf Steudel, Jürgen Steidel, Richard Reinhardt	Requires 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

2	Author	Ralf Steudel	Requires 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