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1Author    Joachim FuchsRequires cookie*
 Title    Kristallstrukturen und Schwingungsspektren zweier  
 Abstract    isomerer Oktadekawolframatodiarsenate, (NH4)6As2W180 62 • #iH20 C rystal S tructures and V ibrational Spectra of Tw o Isom ers of O ctadecatungsto-diarsenate (N H 4)6A s2W 18 0 6 2 • mH20 H o lg er N eu b e rt Six possible structures of A s2W ,80 626~ are discussed, and an exact nom enclature is proposed. The structures of the isomeric title compounds (I and II) were determ ined by X-ray diffraction. I crystallizes in space group P I with lattice param eters a = 12.965(4), b = 14.803(5), c = 18.515(6) Ä; a = 96.280(23)°, ß = 91.420(25)°, y — 115.320(25)°. The anion has the configuration first observed in K6P2W ,80 62-14 H 20 (D awson-structure). II was not known until now. It crystal­ lizes in the trigonal space group R 3 with lattice param eters a — b — 37.857(32). c = 13.108(13) Ä; a — ß = 90°, y = 120°. The structure of this anion differs from the D awson-structure by the 60° rotation of both polar groups of three W 0 6-octahedra (/3-type), followed by the 60° rotation of one of the two new AsWyO,,-units. Both rotations are about the 3-fold axis. The anion is centrosym m etric. Vibrational spectra and preparation of the isomers are described. 
  Reference    Z. Naturforsch. 42b, 951—958 (1987); eingegangen am 4. März/11. Mai 1987 
  Published    1987 
  Keywords    T ungstoarsenates, Isomers, X-Ray, V ibrational Spectra, Preparation 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0951.pdf 
 Identifier    ZNB-1987-42b-0951 
 Volume    42 
2Author    Lothar Ohse, Mehmet Somer, Wolfgang Blase, Gerhard CordierRequires cookie*
 Title    Verbindungen mit SiS2-isosteren Anionen i  
 Abstract    [AlX4/2 3 ] und i |InP4/23 ]: Synthesen, Kristallstrukturen und Schwingungsspektren von Na3|AlX2], K2Na[AlX2] und K3IInP2] (X = P, As) Com pounds with SiS2 Isoelectronic Anions l [A1X4 23-] and i [InP4/23-]: Synthesis, Crystal Structures and Vibrational Spectra of N a3[AlX2], K 2Na[AlX2] and K 3[InP2] (X = P, As) The title compounds were prepared from stoichiometric mixtures o f the elements or from alkali metals (Na, K), NaX (KX) and MX (M = Al, In; X = P, As) at 1000 K. The crystal structures (Ibam, No. 72) are characterized by infinite chains o f edge sharing tetrahedra j, [MX4;,3'] (M = Al, In; X = P, As) which are isoelectronic to SiS2. The vibrational spectra can be interpreted with respect to the symmetry P(2/m 2/c) 42/ m -D 4h of the isolated polymeric chain ][M X 4(23"]. The assignment of the observed frequen­ cies is supported by a normal coordinate analysis using the fragment method. 
  Reference    Z. Naturforsch. 48b, 1027—1034 (1993); eingegangen am 29. März 1993 
  Published    1993 
  Keywords    Zintl Phases, Preparation, Crystal Structure, V ibrational Spectra, Force Constants 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-1027.pdf 
 Identifier    ZNB-1993-48b-1027 
 Volume    48 
3Author    RainerM. Attes, Bernd FüsserRequires cookie*
 Title    Salze der 1.2-Hydrazin-bis(dithiocarbonsäure): Darstellung, Schwingungsspektren und Struktur Preparation, V ibrational Spectra and Structure of Alkahm etal Salts of the l,2-H ydrazine-bis(dithiocarboxylic Acid)  
 Abstract    The following salts of the l,2-hydrazine-bis(dithiocarboxylic acid) have been prepared: Mi[S->CNH —NHCS^], M = N a, K and M3[S->CN-NHCS2], M — Na, K. In the solvated crystals K2 1S2C N H -N H C S 2 '] • 4 C H 3O H (a = 718.0(5), b = 1329.3(8), c = 937.7(9) pm , ß = 109.26(6)°, space group C2/m , Z = 2) the [S2C N H -N H C S 2]2" ion possesses crystallographic C2h sym metry, i.e. a trans planar structure with a N -N bond length of 139.2(3) pm. V ibrational spectra indicate a lower sym metrical anion in the unsolvated crystals. In the trianion [S2CN —N HCS2]3_ the C —N stretching vibrations are observed at 1400 and 1310 cm" 1. 
  Reference    (Z. Naturforsch. 39b, 1 [1984]; eingegangen am 14. Septem ber 1983) 
  Published    1984 
  Keywords    l, 2-H ydrazine-bis(dithiocarboxylates), Preparation, Crystal Structure, V ibrational Spectra 
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 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-0001.pdf 
 Identifier    ZNB-1984-39b-0001 
 Volume    39 
4Author    Ralf Steudel, Jürgen Steidel, Torsten SandowRequires cookie*
 Title    Preparation and Crystal Structure of £7s-Tetrachlorobis(cycIooctasulfurmonoxide)tin(IV) [1]  
 Abstract    Yellow crystals of c/s-[SnCl4(S8 0) 2] containing the homocyclic sulfur oxide S80 have been prepared from the com ponents in carbon disulfide at —35 °C. A n X-ray structural analysis carried out at —105 °C showed the com pound to be monoclinic, space group P2 Jn with Z = 4 in a unit cell of dimensions a = 821.2(2) pm, b = 1331.9(4) pm , c = 2071.7(6) pm and ß -91.82(2)°. The structure was refined to a final agreem ent factor R = 0.038 for 2022 reflections. The tin atom is surrounded by a distorted octahedron of two oxygen atom s in cw-positions and four chlorine atom s in accordance with other oxygen-bonded complexes of SnCl4. The molecular symmetry is approximately C2, and the SS bond lengths in the ligands vary betw een 201 and 218 pm. V ibra­ tional spectra of [SnCl4 (SH 0) 2] are reported. The title com pound is the second example containing S80 as a ligand. 
  Reference    Z. Naturforsch. 41b, 951 (1986); received April 29 1986 
  Published    1986 
  Keywords    Sulfur Oxides, Tin T etrachloride, Crystal Structure, Complex Form ation, V ibrational Spectra 
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 TEI-XML for    default:Reihe_B/41/ZNB-1986-41b-0951.pdf 
 Identifier    ZNB-1986-41b-0951 
 Volume    41