Abstract
In our attempt to search for mixed alkaline-earth and transition metal arsenates, the title compound, barium dimanganese(II) bis-(arsenate), has been synthesized by employing a high-temperature RbCl flux. The crystal structure of BaMn2(AsO4)2 is made up of MnO6 octa-hedra and AsO4 tetra-hedra assembled by sharing corners and edges into infinite slabs with composition [Mn2(AsO4)2]2- that extend parallel to the ab plane. The barium cations reside between parallel slabs maintaining the inter-slab connectivity through coordination to eight oxygen anions. The layered anionic framework comprises weakly inter-acting [Mn4O18]28- tetra-meric units. In each tetra-mer, the manganese(II) cations are in a planar arrangement related by a center of inversion. Within the slabs, the tetra-meric units are separated from each other by 6.614 (2) Å (Mn⋯Mn distances). The title compound has isostructural analogues amongst synthetic SrM2(XO4)2 compounds with M = Ni, Co, and X = As, P.
Highlights
In our attempt to search for mixed alkaline-earth and transition metal arsenates, the title compound, barium dimanganese(II) bis(arsenate), has been synthesized by employing a high-temperature RbCl flux
The crystal structure of BaMn2(AsO4)2 can be described as a three-dimensional framework containing slabs of composition
Bond-valence sum (BVS) calculations (Brese & O’Keefe, 1991) for BaMn2(AsO4)2 result in values of 2.19, 1.84, 4.87, 5.05 and 1.98 valence units for Mn1, Mn2, As1, As2 and Ba1, respectively, which in each case is close to the expected values of 2 for Mn, 5 for As and 2 for Ba
Summary
In our attempt to search for mixed alkaline-earth and transition metal arsenates, the title compound, barium dimanganese(II) bis(arsenate), has been synthesized by employing a high-temperature RbCl flux. Crystal structure of BaMn2(AsO4)2 containing discrete [Mn4O18]28 units BaMn2(AsO4)2 is made up of MnO6 octahedra and AsO4 tetrahedra assembled by sharing corners and edges into infinite slabs with composition
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