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1Author    Falk Lissner, FrankA. Weber, Thomas SchleidRequires cookie*
 Title    Drei Formen des Samarium(III)-Sulfidselenids Sm2S2_JC Se1+A . (0,1 < x < 0,2) Three Types of the Samarium(III) Sulfide Selenide Sm2S2_ vSe1+JC (0.1 < x < 0.2)  
 Abstract    Single crystals of Sm2 S2 -jSe1+x (0.1 < x < 0.2) have been obtained for the first time through the oxidation of KSm2Cl5 with an excess of sulfur and selenium in equimolar amounts at 850 °C after seven days in evacuated silica tubes. They emerged as almost black, in thin layers deep red, lath-shaped needles (A and U type, respectively) as well as red, bead-shaped polyhedra (C type) of the gross chemical composition Sm2S2Se according to X-ray structure analyses. A much simpler method of synthesis is based on the direct fusion of the elements (samarium, sulfur and selenium) in appropriate molar ratios (2:2:1) in the presence of NaCl as a flux under otherwise analogous conditions (silica tubes, 7 d, 850 °C). A-Sm2 S1.82Se1.18 crystallizes orthorhombically (a = 753.1(3), b = 401.9(1), c = 1565.8(6) pm, Z = 4) in the space group Pnma with the a-G d2 S3-type structure. Two crystallographically different Sm3+ cations are coordinated by eight (Sm l) and seven (Sm2) Ch2~ anions (S2_ and Se2 -) as bi-and monocapped trigonal prisms, respectively. C-Sm2S! 90 Se, 10 adopts the cubic 7 -Ce2 S3-type structure (/ 43d; a = 858.7(2) pm, Z = 5.333) with trigon-dodecahedrally coordinated Snr + cations (CN = 8). Finally, U-Sm2S L84Se116 with the orthorhombic U2S3-type structure (Pnma; a = 1105.3(6), b = 399.2(1), c = 1074.0(5) pm, Z = 4) exhibits two crystallographically different Sm3+ cations again, which are coordinated by seven (Sml) and seven plus one (Sm2) Ch2_ anions, respectively. The preferential occupation of S _ and Se2-anions at only one in the C-type, but three anionic sites each in the A-and U-type crystal structures of Sm2 S2 -*Se1+;c (0 . 1 < x < 0 .2) is discussed. 
  Reference    Z. Naturforsch. 56b, 990—996 (2001); eingegangen am 14. Juni 2001 
  Published    2001 
  Keywords    Samarium, Sulfides, Selenides 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-0990.pdf 
 Identifier    ZNB-2001-56b-0990 
 Volume    56 
2Author    Petra Lauxmann, Thomas SchleidRequires cookie*
 Title    CsCu3Dy2S5 und CsCu3Er2S5 : Zwei isotype quaternäre Sulfide der Lanthanoide mit Kanalstrukturen CsCu3Dy2S5 and CsCu3Er2S5: Two Isotypic Quaternary Sulfides of the Lanthanides with Channel Structures  
 Abstract    Orthorhombic single crystals of CsCu3 Dy2 S5 (a = 397.54(4), b = 1414.8(1), c = 1685.7(2) pm) and CsCu3 Er2 S5 (a = 394.82(4), b= 1410.9(1), c = 1667.2(2) pm; both Cmcm, Z = 4) are obtained as by-products (pale yellow or pink transparent needles) in attempts to synthesize CuMS2 (M = Dy and Er) through the oxidation of elemental copper, dysprosium and erbium, respectively, with sulfur (molar ratios: 1 :1 :2) in the presence of equimolar amounts of cesium chloride (CsCl) as fluxing agent at 900 °C within fourteen days from torch-sealed evacuated silica tubes. Their crystal structure contains octahedral [MS6]9~ units (d(M-S) = 269 -282 pm) which share edges and vertices to form layers ^ {(M 2 S5)4_} parallel (010). These are three-dimensional-ly interconnected along [010] by two crystallographically different Cu+ cations in tetrahedral coordination of S2_ anions (d(Cu-S) = 227 -269 pm) according to ^{(Cu^MtSs)-}. Thereby a likewise layered substructure 2,{(Cu3 S5)7 -} is formed parallel (010) by edge-and vertex-linking of all [CuS4]7~ tetrahedra. Large channels within the <£>{(Cu3 M2 S5)~ } network spread along [100] and suit well to take up the highly coordinated Cs+ cations, which are surrounded by eight plus one S2~ anions at distances between 340 and 358 pm (8 x) with the ninth ligand 420 -421 pm apart in the shape of (2+7)-fold capped trigonal prisms. 
  Reference    Z. Naturforsch. 56b, 1149—1154 (2001); eingegangen am 27. August 2001 
  Published    2001 
  Keywords    Copper, Lanthanides, Sulfides 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-1149.pdf 
 Identifier    ZNB-2001-56b-1149 
 Volume    56 
3Author    HansH. KarschRequires cookie*
 Title    Funktionelle Trimethylphosphinderivate, VIII [1] Phosphoniumsalze, Oxide und Sulfide von Tetraorganodiphosphinomethanen, R2PCH2P(CH3)2  
 Abstract    Tetramethyldiphosphinomethane (CH3)2PCH2(CH3)2 (la) reacts with HCl/ether to form the mono-and bisquaternary salts [(CH3)2PCH2P(H)(CH3)2]C1 (2) and [(CH3)2(H)PCH2P(H)(CH3)2]Cl2 (3), respectively. The system 1 a/HCl, incorporating 1 a/2/3, represents a useful tool for studying the appearance of XnAA'X'n-spin type systems. These compounds are also prototypes for a variety of other mono-or bis-phosphonium salts, which are formed in the reactions of the diphosphines (CH3)2PCH2PR2 (R — CH3, *-C4H9, C6H5) (la-c) with (CH3)2C0 + HC1, CH3I, *-C4H9Br, C6H5C0C1, (CH3)2PC1 and Br(CH2)nBr (n = 1, 2). Heterocycles are not obtained. The dioxide 14 and the disulfide 15 are also described. Some properties and spectroscopic data (IR, 1 H, 31 P and 13 C NMR) of 26 new compounds are reported and briefly discussed. 
  Reference    (Z. Naturforsch. 34b, 31—43 [1979]; eingegangen am 8. September 1978) 
  Published    1979 
  Keywords    Phosphonium Salts, Oxides, Sulfides, NMR 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0031.pdf 
 Identifier    ZNB-1979-34b-0031 
 Volume    34 
4Author    Z. NaturforschRequires cookie*
 Title    Über Sulfide und Oxidsulfide des Samariums  
 Abstract    Stoichiometric oxidation o f SmCl2 with sulfur in the presence o f NaCl (evacuated silica ves­ sel, 850 °C, 7 d) results in the formation o f A -S m -,S 3 (orthorhombic, Pnma (no. 62), a = 737.64(5), b = 397.44(3), c = 1536.26(9) pm, Z = 4, /?w = 0.017). In contrast, C ~ S m 2S3 (cubic, I4 3 d (no. 220), a = 844.71(3) pm, Z = 5.333, Rw = 0.017) is obtained upon reaction o f the 
  Reference    Z. Naturforsch. 47b, 1614 (1992); eingegangen am 1. Juli 1992 
  Published    1992 
  Keywords    Samarium, Sulfides, Oxysulfides, Crystal Structure 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1614.pdf 
 Identifier    ZNB-1992-47b-1614 
 Volume    47 
5Author    H. W. Eißhaar, P. BögerRequires cookie*
 Title    Sulfide Stimulation of Light-Induced Hydrogen Evolution by the Cyanobacterium Nostoc muscorum  
 Abstract    Light-induced hydrogen evolution by the blue-green alga N ostoc muscorum is stim ulated by sulfide with a rate of about 20 (imol H 2 per mg chlorophyll and h our stable for about one day at low light intensities (7 W /m 2). Oxygen evolution does not im pair sulfide-stim ulated hydrogen formation. Increased hydrogen evolution is catalyzed by nitrogenase, its activity is not influenced by sulfide. Apparently, sulfide inhibits the hydrogen-uptake pathw ay(s), thereby increasing net hydrogen evolution. — Furtherm ore, photosynthetic electron flow is inhibited by sulfide, essen­ tially at the oxidizing side o f photosystem II, as was dem onstrated by fluorescence-signal changes. This leads to decreased electron supply o f nitrogenase. Hydrogen production apparently is at optim um when both the effect o f sulfide on photo­ synthesis is moderate and when uptake-hydrogenase activity is abolished. 
  Reference    Z. Naturforsch. 38c, 237 (1983); received D ecem ber 8 1982 
  Published    1983 
  Keywords    Hydrogen Production, Photobiology, Sulfide, Blue-Greens 
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 TEI-XML for    default:Reihe_C/38/ZNC-1983-38c-0237.pdf 
 Identifier    ZNC-1983-38c-0237 
 Volume    38