ISSN:
0044-2313
Keywords:
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
On Mixed-valent Oxoplumbates. On Rb2Pb4O7 = Rb2Pb2IIPb2IVO7For the first time, Rb2Pb4O7 has been prepared by annealing mixtures of Rb2O3 and PbO with Rb:Pb = 1:2 [Ag-cylinders, sealed under vacuum in Duran-glass ampoule, 450°C, 30 d (single crystals)]. The rubin red single crystals are of longish [001] shape. The structure determination [5162 symmetry independent hkl, four-circle-diffractometer CAD 4 (Fa. Enraf-Nonius), ω-2Θ - scan, AgKα, ψ-scan absorption correction, R = 7.54%, RW = 7.71%] confirms the space group P1 with a = 1036.00(10), b = 733.72(8), c = 663.54(10) pm, α = 90.049(12)°, β = 99.236(12)°, γ = 101.641(12)°, Z = 2, drö = 7,58 g · cm-3, dpyk = 7,55 g · cm-3. The structure is characterized by a layer-lattice. The coordination number is three for Pb2+, six for Pb4+. The Madelung Part of Lattice Energy, MAPLE, Effective Coordination Numbers, ECoN, these via Mean Effective Ionic Radii, MEFIR, are calculated.
Notes:
Neu dargestellt wurde Rb2Pb4O7 durch Reaktion von Rb2O3 mit PbO mit Rb:Pb = 1:2 [Ag-Bömbchen, Vakuum, Duranglasampulle, 450°C, 30 d (Einkristalle)]. Rubinrote Einkristalle von länglichem Habitus (längs [001]). Die Strukturaufklärung [5162 hkl, Vierkreisdiffraktometer CAD 4 (Fa. Enraf-Nonius), ω-2Θ - scan, AgKα, ψ-scan Absorptionskorrektur, R = 7,54%, RW = 7,71%] belegt Raumgruppe P1 mit a = 1036,00(10), b = 733,72(8), c = 663,54(10) pm, α = 90,049(12)°, β = 99,236(12)°, γ = 101,641(12)°, Z = 2, drö = 7,58 g · cm-3, dpyk = 7,55 g · cm-3. Es liegt eine Schichtstruktur vor. C.N. 6 für Pb4+, C.N. 3 für Pb2+. Der Madelunganteil der Gitterenergie, MAPLE, Effektive Koordinationszahlen, ECoN, diese über Mittlere Effektive Ionenradien, MEFIR, werden berechnet.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/zaac.19834990417
