Preparation and crystal structures of (Hg3)(PO4)Cl, (Hg3)(AsO4)Cl and (Hg3)(AsO4)Br -: Mercury compounds with the triangular Hg34+ cluster

被引：0
|
作者：
Weil, M [1 ]
机构：
[1] Tech Univ Vienna, Inst Mineral Kristallog & Strukturchem, A-1060 Vienna, Austria
来源：
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES | 2001年 / 56卷 / 08期
关键词：
kuznetsovite; mercury cluster Hg-3(4+); merohedral twinning;
D O I：
暂无
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The compounds (Hg-3)(PO4)Cl, (Hg-3)(AsO4)Cl and (Hg-3)(AsO4)Br have been prepared under hydrothermal conditions at 200 degreesC, starting from stoichiometric mixtures of the corresponding mercury halides and mercury phosphates or arsenates, respectively. The formula (Hg-3)(AsO4)Cl is identical with that of the mineral kuznetsovite. All compounds are isotypic and crystallize with four formula units in the space group P2(1)3 [(Hg-3)(PO4)Cl: a = 8.2912(5) Angstrom; (Hg-3)(AsO4)Cl: a = 8.3983(6) Angstrom; (Hg-3)(AsO4)Br: a = 8.4611(5) Angstrom]. All crystal structures have been refined from single crystal diffractometer data sets under consideration of merohedral twinning according to a diagonal mirror plane as twin element. The structures comprise of equilateral mercury triangles with mean distances (d) over bar (Hg-Hg) = 2.659 Angstrom, which are bonded to halogen and oxygen atoms of nearly perfect PO4 or AsO4 tetrahedra, respectively.
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页码：753 / 758
页数：6
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