The crystal structure of bideauxite, Pb2(2+) Ag+ Cl3 F (OH), cubic, a 14.1273(6) Å, V 2819.2(4) Å3, Fdbar3m, Z = 16, D-calc = 6.26 g.cm-3, has been solved by direct methods and refined to an R index of 2.8% for 324 observed (5 sigma) reflections measured with MoK-alpha X-radiation. There is one unique Ag site surrounded by an octahedral array of CP anions, and one Pb site surrounded by nine anions with a very asymmetrical distribution of bonds and bond-lengths characteristic of stereoactive lone-pair behavior of Pb2+. Four (AgCl6) octahedra link by sharing corners to form an [Ag4Cl18] cluster, and these clusters link by sharing corners to form a three-dimensional chequerboard arrangement, with [Pb4 (OH)(2) F2 Cl18] clusters filling the interstices. The structure of bideauxite is not related to those of the paragenetically related minerals boleite and pseudoboleite.

Stereoactive lone-pair behaviour of Pb2+ in the crystal structure of bideauxite: Pb2+2Ag+Cl3F(OH)

MERLINO, STEFANO;PASERO, MARCO;PERCHIAZZI, NATALE
1999

Abstract

The crystal structure of bideauxite, Pb2(2+) Ag+ Cl3 F (OH), cubic, a 14.1273(6) Å, V 2819.2(4) Å3, Fdbar3m, Z = 16, D-calc = 6.26 g.cm-3, has been solved by direct methods and refined to an R index of 2.8% for 324 observed (5 sigma) reflections measured with MoK-alpha X-radiation. There is one unique Ag site surrounded by an octahedral array of CP anions, and one Pb site surrounded by nine anions with a very asymmetrical distribution of bonds and bond-lengths characteristic of stereoactive lone-pair behavior of Pb2+. Four (AgCl6) octahedra link by sharing corners to form an [Ag4Cl18] cluster, and these clusters link by sharing corners to form a three-dimensional chequerboard arrangement, with [Pb4 (OH)(2) F2 Cl18] clusters filling the interstices. The structure of bideauxite is not related to those of the paragenetically related minerals boleite and pseudoboleite.
Cooper, Ma; Hawthorne, Fc; Merlino, Stefano; Pasero, Marco; Perchiazzi, Natale
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/205958
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