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'Vibrational spectra' in keywords Facet   Publication Year 1999  [X]
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1999[X]
1Author    M. Atthias, W. Anner1, W. Olfgang, K. Aim, Volker Lorenzenb, W. Ilhelm, P. ReetzRequires cookie*
 Title    Hexaborate Cluster Radical Anions [B6Haln Hal'^« ]*" and [B6Hal5R]*_ (Hai, Hai' = CI, Br, I; R = H, alkyl). Chemical or Electrochemical Generation, Vibrational, UV-Vis and EPR Spectroscopy  
 Abstract    Paramagnetic hexaborate clusters with mixed halide, halide/alkyl or halide/hydride substi­ tution were prepared from oxidizable dianionic precursors and were characterized by cyclic voltammetry, EPR, vibrational and UV-VIS spectroscopy. The EPR studies reveal increasing g anisotropy and EPR linewidths on replacing Cl by Br and especially by I substituents; on the other hand, the replacement of one halide by one alkyl (CH3 or CFFCN) or hydride substituent in [BftHalsR]*-causes decreasing radical persistence and g anisotropy. These results indicate a fairly uniform participation of the cluster core and the substituent sphere in the spin distribution as a major factor for the stability of these non-7r radicals. 
  Reference    Z. Naturforsch. 54b, 1103—1108 (1999); received June 2 1999 
  Published    1999 
  Keywords    EPR Data, Halogenohexaborates, Radical Anions, Vibrational Spectra 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1103.pdf 
 Identifier    ZNB-1999-54b-1103 
 Volume    54 
2Author    C. Drewes, W. PreetzRequires cookie*
 Title    Darstellung und spektroskopische Charakterisierung von Methylnitro  
 Abstract    -c/oso-hexaboraten sowie Kristallstrukturen von cis-(Ph4As)2[B6H4(CH3)(N02)],/ac-(Ph4As)2[B6H3(CH3)(N02)2] CH3CN und /ner-(Ph4P)2[B6H3 (CH3)(N 02)C 2] Synthesis and Spectroscopic Characterization o f Methylnitro-c/oso-hexaborates and Crystal Structures o f m -(P h 4 As)2 [B6H4 (CH3) (N 0 2)],/flc-(P h4A s)2 [B6H3(CH3)(N 0 2)2] • CH3CN and mer-(Ph4 P)2 [B6H3(CH3) (N 0 2)c2] Methylnitrotetrahydro-c/<m>-hexaborate(2-), Methyldinitr0trihydr0-c/as'0-hexab0rate( 
  Reference    Z. Naturforsch. 54b, 349—356 (1999); eingegangen am 11. November 1998 
  Published    1999 
  Keywords    ), Crystal Structure, 11B NMR Spectra, Vibrational Spectra 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0349.pdf 
 Identifier    ZNB-1999-54b-0349 
 Volume    54 
3Author    Karsten Schweiger, Heiner Hückstädt, Heiner HomborgRequires cookie*
 Title    Darstellung  
 Abstract    und Eigenschaften von Tetra(w-butyl)ammonium-c/s-diacidooxophthalocyaninato(2-)niobaten(V) und -tantalaten(V); Kristallstruktur von (wBu4N)CIS[Nb(F)20pc2'] Preparation and Properties of Tetra(«-butyl)ammonium c/'s-Diacidooxophthalocyanina-to(2-)niobates(V) and -tantalates(V); Crystal Structure of ("Bu4N)m [Nb(F)2Opc2~j Tetra(n-butyl)ammonium ds-diacidooxophthalocyaninato(2-)niobates(V) and -tantalates(V), (''Bu4N)m [M(X)2Opc2~] (M = Nb, Ta; X = F, Cl, NCS, N3), are obtained by the reaction of m [M(Cl)3pc2~] or m [M(Cl}Opc2~] (M = Nb, Ta) with the respective tetra(n-butyl)ammonium salt. ('!Bu4N)c'v[Nb(F)oOpc'_ ] crystallizes in the monoclinic space group P2\tn with cell pa­ rameters a = 13.460(5'), b = 13.820(5), c = 23.360(5) Ä, ß = 92.640(5)°, Z = 4. The hepta-coordinated Nb(V) atom is surrounded by four isoindole nitrogen atoms (Niso) of the pc2~ ligand, two fluorine atoms and one oxygen atom in a distorted square-base-trigonal-cap poly­ hedron. Nb(V) is displaced out o fothe centre of the (N,.s")4 plane (Ct(N,.so)) towards the acido ligands (d(Nb-Ct(Niso)) = 1.241 A). The average (Nb-NIJO), (Nb-F), and (Nb-O) distances are 2.300, 1.957, and 1.720(5) A, the (F-Nb-F) and the average (O-Nb-F) angles are 79.8(2) and 91.8°, respectively. The pc2_ ligand is concavely distorted. Typical 7r-7r*-transitions of the pc2~ligand are observed in the UV/Vis spectra at ca. 14500 and 29300 cm-1 . Vibration frequencies t/asiS(M-X), ^(M-O) and (5(X-M-0) have been assigned. 
  Reference    Z. Naturforsch. 54b, 963—969 (1999); eingegangen am 23. April 1999 
  Published    1999 
  Keywords    Phthalocyaninates, Niobium and Tantalum Compounds, Optical Spectra, Vibrational Spectra, Crystal Structure 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0963.pdf 
 Identifier    ZNB-1999-54b-0963 
 Volume    54 
4Author    C. Drewes, W. PreetzRequires cookie*
 Title    Synthese  
 Abstract    , Spektren und Kristallstruktur von c/s-Monobenzylmononitrotetrahydro-c/0S0-hexaborat(2-) Synthesis, Spectra and Crystal Structure of c/s-Monobenzylmononitrotetrahydro-c/oj'o-hexaborate(2-) 
  Reference    Z. Naturforsch. 54b, 1219—1221 (1999); eingegangen am 30. Juni 1999 
  Published    1999 
  Keywords    m-Monobenzylmononitrotetrahydro-c/os0-hexaborate(2-), Crystal Structure, 11B NMR Data, Vibrational Spectra 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1219.pdf 
 Identifier    ZNB-1999-54b-1219 
 Volume    54 
5Author    V. Lorenzena, W. Preetz, W. Kellerb, W. HauboldRequires cookie*
 Title    Schwingungsspektren und Normalkoordinatenanalyse der Tetrahalogeno-c/os0-l,2-diphosphahexaborane P2B4X4, X = CI, Br Vibrational Spectra and Normal Coordinate Analysis of the Tetrahalogeno-c/oso-l,2-diphosphahexaboranes P2B4X 4, X = Cl, Br  
  Reference    Z. Naturforsch. 54b, 1229—1234 (1999); eingegangen am 10. August 1999 
  Published    1999 
  Keywords    Tetrahalogeno-c/aso-1, 2-diphosphahexaboranes, Vibrational Spectra, Normal Coordinate Analyses, Force Constants 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1229.pdf 
 Identifier    ZNB-1999-54b-1229 
 Volume    54