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Mg7(AsO4)2(HAsO4)4：一种具有极强氢键的新型砷酸镁。

Mg7(AsO4)2(HAsO4)4: a new magnesium arsenate with a very strong hydrogen bond.

作者信息

Kolitsch Uwe, Bartu Petr

机构信息

Universität Wien, Institut für Mineralogie und Kristallographie, Geozentrum, Althanstrasse 14, A-1090 Wien, Austria.

出版信息

Acta Crystallogr C. 2004 Sep;60(Pt 9):i94-6. doi: 10.1107/S010827010401813X. Epub 2004 Aug 21.

DOI:10.1107/S010827010401813X
PMID:15345819
Abstract

A new compound, heptamagnesium bis(arsenate) tetrakis(hydrogenarsenate), Mg7(AsO4)2(HAsO4)4, was synthesized by a hydrothermal method. The structure is based on a three-dimensional framework of edge- and corner-sharing MgO6, MgO4(OH)2, MgO5, AsO3(OH) and AsO4 polyhedra. Average Mg-O and As-O bond lengths are in the ranges 2.056-2.154 and 1.680-1.688 A, respectively. Each of the two non-equivalent OH groups is bonded to both an Mg and an As atom. One OH group is involved in a very short hydrogen bond [O.O = 2.468 (3) A]. The formula unit is centrosymmetric, with all atoms in general positions except for one Mg atom, which has site symmetry -1. The compound is isotypic with Mn7(AsO4)2(HAsO4)4 and M7(PO4)2(HPO4)4, where M is Fe, Co or Mn.

摘要

通过水热法合成了一种新化合物七镁双（砷酸盐）四（氢砷酸盐），即Mg7(AsO4)2(HAsO4)4。其结构基于由边共享和角共享的MgO6、MgO4(OH)2、MgO5、AsO3(OH)和AsO4多面体构成的三维骨架。Mg - O和As - O的平均键长分别在2.056 - 2.154 Å和1.680 - 1.688 Å范围内。两个不等价的OH基团中的每一个都与一个Mg原子和一个As原子相连。一个OH基团参与形成一个非常短的氢键[O.O = 2.468 (3) Å]。化学式单元是中心对称的，除了一个具有位点对称性-1的Mg原子外，所有原子都处于一般位置。该化合物与Mn7(AsO4)2(HAsO4)4和M7(PO4)2(HPO4)4同型，其中M为Fe、Co或Mn。

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