ISSN:
0044-2313
Keywords:
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
New Oxoplumbates(II) A2PbO2 (A = K, Rb, Cs), with Binuclear Groups [OPbO2PbO]Unknown K2PbO2, Rb2PbO2 and Cs2PbO2 (yellowish powder, yellowish transparent single crystals, respectively) have been prepared, The compounds crystallize triclinic with a = 10.901 Å, b = 7.606 Å, c = 7.328 Å, α = 119.35°, β = 88.42°, γ =117,73°, (K2PbO2); a = 10.907 Å, b = 8.510 Å, c = 7.815 Å, α = 124.00°, β = 84.97°, γ = 120.68° (Rb2PbO2) and a = 11.644 Å, b = 8.905 Å, c = 8.040 Å, α = 123.32°, β = 85.70°, γ = 120.49° Z = 4, space group P1-C/i1. For K2PbO2 we find R = 8.65% and Rw = 9.32% (2283 independent reflections). Parameters see text. There are isolated [Pb2O4]groups, which are connected in a complicated way by mutual K+ ions forming layers. The Madelung Part of the Lattice Energy, MAPLE, and Effective Coordination Numbers, ECoN, these by means of mean Fictive Ionic Radii, MEFIR, are calculated and discussed.
Notes:
Neu dargestellt wurden K2PbO2, Rb2PbO2 und Cs2PbO2, gelbliche Pulver bzw. gelbliche, wasserklare Einkristalle, die triklin mit a = 10,901 Å, b = 7,606 Å, c = 7,328 Å, α = 119,35°, β = 88,43°, γ =117,73°, (bei K2PbO2); a = 10,907 Å, b = 8,510 Å, c = 7,815 Å, α = 124,)0°, β = 84,97°, γ = 120,68° (bei Rb2PbO2) und a = 11,644 Å, b = 8,905 Å, c = 8,040 Å, α = 123,32°, β = 85,70°, γ = 120,49° (bei Cs2PbO2; Z = 4, in der Raumgruppe P1—Ci1 kristallisieren. Bei K2PbO2 ist für 2283 unabhängige Reflexe R = 8,65% und Rw = 9,32%. Parameter siehe Text. Es liegen „isolierte“[Pb2O4]-Baugruppen vor, die in komplizierter Weise über gemeinsame K+ schichtartig verknüpft werden. Der Madelunganteil der Gitterenergie, MAPLE, und Effektive Koordinatioszahlen, ECoN, diese über Mittlere Fiktive Ionenradien, MEFIR, werden berechnet und diskutiert.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/zaac.19784400109
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