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'Niobium and Tantalum Compounds' in keywords
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1999 (1)
1Author    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