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'Iron' in keywords Facet   Publication Year 1995  [X]
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1Author    F.-DM. Artin, H.K M Üller-B, UschbaumRequires cookie*
 Title    Eine synthetische Spezies zum Mineral Howardevansit mit Eisen anstelle von Kupfer: NaFe3V 30 12  
 Abstract    Single crystals of NaFe3V30 12 have been prepared by solid state reaction below the melt­ ing point of the reaction mixture. This compound is isotypic to the mineral Howardevansite but shows lower triclinic symmetry, space group C }-P 1 , a = 6.757(2), b = 8.155(2), c = 9.816(3) Ä, a = 106.05(2), ß = 104.401(9), y = 102.09(2)°, Z = 2. The acentric space group is caused by the sodium positions, all other atoms comply with the space group PI of Howarde­ vansite. The different ions are coordinated by O2-forming V 0 4 tetrahedra, FeOfi octahedra, trigonal FeOs bipyramids and irregular NaOs and NaOy polyhedra, respectively. The crystal chemistry is discussed with respect to Howardevansite. 
  Reference    (Z. Naturforsch. 50b, 51—55 [1995]; eingegangen am 5. August 1994) 
  Published    1995 
  Keywords    Sodium, Iron, Vanadium, Oxide, Crystal Structure 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0051.pdf 
 Identifier    ZNB-1995-50b-0051 
 Volume    50 
2Author    Wolfgang Pohl, Ingo-Peter Lorenz, Heinrich Nöth, Martin SchmidtRequires cookie*
 Title    Offene und geschlossene Triferriophosphonium-Salze und Triferriophosphane O pen and Closed Triferriophosphonium Salts and Triferriophosphines  
 Abstract    The reaction of P(SiM e3)3 with an excess of C pFe(CO)2X (X = Cl, Br) through the action o f water gives the triferriophosphonium salt [{CpFe(CO)2}3PH]2FeX4 together with ferrocene as by-product. The cation of the salt can be deprotonated by D B U to afford the unstable triferriophosphine {CpFe(CO)2}3P. Its subsequent realkylation with RX (R = Me, CH2Ph; X = I, Br) leads to alkyltriferriophosphonium salts [{CpFe(CO)2}3PR]X. Photolysis of [{CpFe(CO)2}3PH]2FeX 4 induces the elimination of one CO group, and the CO-bridged and partly closed complex [{//-CO(CpFeCO)2}{CpFe(CO)2}PH]2FeX 4 is formed, the cation of which can also be deprotonated to give the corresponding m onobridged phosphine (w-CO(CpFeCO)2}{CpFe(CO)2}P. Both PH-phosphonium salts undergo a hydrogen-chlorine exchange reaction to give the P -C l analogues [{CpFe(CO)2}3PCl]2FeX4 and [{//-CO (CpFeCO)2}{CpFe(CO)2}PCl]2FeX 4. The IR and NM R spectra of all species as well as the X-ray structure analyses of the open and closed P -H functional com plexes are reported and discussed. 
  Reference    Z. Naturforsch. 50b, 1485—1493 (1995); eingegangen am 30. März 1995 
  Published    1995 
  Keywords    Iron, Tristrimethylsilylphosphine, Hydrogen Chlorine Exchange, X-Ray, Decarbonylation 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-1485.pdf 
 Identifier    ZNB-1995-50b-1485 
 Volume    50