Crystal chemistry of natural and synthetic lead oxohalides: II. Crystal structure of Pb7O4(OH)4Br2

被引：6

作者：

Siidra, O. I. ^{[1
]}

Krivovichev, S. V. ^{[1
]}

Depmeier, W. ^{[2
]}

机构：

[1] St Petersburg State Univ, St Petersburg 199034, Russia

[2] Univ Kiel, Inst Geosci, D-24118 Kiel, Germany

来源：

GEOLOGY OF ORE DEPOSITS | 2008年 / 50卷 / 08期

基金：

俄罗斯基础研究基金会;

关键词：

D O I：

10.1134/S1075701508080187

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

Crystals of lead oxobromide Pb7O4(OH)(4)Br-2 have been synthesized by hydrothermal method. The structure of the new compound has been studied with X-ray single-crystal diffraction analysis. The compound is monoclinic, space group C112(1); unit-cell dimensions are a = 5.852(4), b = 13.452(7), c = 19.673(9) A..., gamma = 90.04A degrees, V = 1548.7(15) A...(3). The structure has been solved by direct methods and refined to R (1) = 0.1138 for 1847 observed Pb7O4(OH)(4)Br-2 unique reflections. The structure contains seven symmetrically independent bivalent Pb atoms. The coordination polyhedrons of Pb are strongly distorted due to stereochemical activity of unshared electron pair 6s (2). Oxygen atoms are tetrahedrally coordinated by four Pb2+ cations with the formation of oxocentered tetrahedrons OPb4. The compound is based on [O2Pb3](2+) double chains formed by OPb4 tetrahedrons. (OH)Pb-2 dimers combine the [O2Pb3](2+) chains into 3D framework. Channels in the framework are parallel to [100] and are occupied by Br anions.

引用

页码：801 / 805

页数：5

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