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Crystal structure of BaMnB 2 O 5 containing structurally isolated manganese oxide sheets

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ABSTRACT

In an attempt to search for mixed alkaline-earth and transition metal pyroborates, the title compound, barium manganese(II) pyroborate, has been synthesized by employing a flux method. The structure of BaMnB2O5 is composed of MnO5 square pyramids that form Mn2O8 dimers by edge-sharing and of pyroborate units ([B2O5]4−) that are composed of two corner-sharing trigonal–planar BO3 units. These building blocks share corners to form ∞2[MnB2O5]2− layers extending parallel to (100). The Ba2+ cations reside in the gap between two manganese pyroborate slabs with a coordination number of nine. The title compound forms an inter­esting spiral framework propagating along the 21 screw axis. The structure is characterized by two alternating layers, which is relatively rare among known transition-metal-based pyroborate compounds.

No MeSH data available.


(a) Partial structure showing Mn2O8 dimers (polyhedral drawing). The apical oxygen, O3, in each MnO5 square pyramid points in opposite directions. (b) Corner-sharing BO3 groups forming a pyroborate unit. The BO3 units within the pyroborate group are linked through a common O atom, O5. (c) The barium cation resides in a BaO9 environment. Anisotropic displacement parameters are drawn at 95% probability.
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fig2: (a) Partial structure showing Mn2O8 dimers (polyhedral drawing). The apical oxygen, O3, in each MnO5 square pyramid points in opposite directions. (b) Corner-sharing BO3 groups forming a pyroborate unit. The BO3 units within the pyroborate group are linked through a common O atom, O5. (c) The barium cation resides in a BaO9 environment. Anisotropic displacement parameters are drawn at 95% probability.

Mentions: The crystal structure of BaMnB2O5 defines a new structure type that can be described as being composed of manganese pyroborate slabs with composition ∞2[MnB2O5]2− that extend parallel to (100). Fig. 1 ▸a shows a perspective drawing of the BaMnB2O5 structure with the quasi-two-dimensional lattice characterized by [MnB2O5]2− slabs. The barium cations reside between the parallel slabs and maintain the inter­slab connectivity through coordination to nine oxygen atoms (Fig. 2 ▸c).


Crystal structure of BaMnB 2 O 5 containing structurally isolated manganese oxide sheets
(a) Partial structure showing Mn2O8 dimers (polyhedral drawing). The apical oxygen, O3, in each MnO5 square pyramid points in opposite directions. (b) Corner-sharing BO3 groups forming a pyroborate unit. The BO3 units within the pyroborate group are linked through a common O atom, O5. (c) The barium cation resides in a BaO9 environment. Anisotropic displacement parameters are drawn at 95% probability.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5120715&req=5

fig2: (a) Partial structure showing Mn2O8 dimers (polyhedral drawing). The apical oxygen, O3, in each MnO5 square pyramid points in opposite directions. (b) Corner-sharing BO3 groups forming a pyroborate unit. The BO3 units within the pyroborate group are linked through a common O atom, O5. (c) The barium cation resides in a BaO9 environment. Anisotropic displacement parameters are drawn at 95% probability.
Mentions: The crystal structure of BaMnB2O5 defines a new structure type that can be described as being composed of manganese pyroborate slabs with composition ∞2[MnB2O5]2− that extend parallel to (100). Fig. 1 ▸a shows a perspective drawing of the BaMnB2O5 structure with the quasi-two-dimensional lattice characterized by [MnB2O5]2− slabs. The barium cations reside between the parallel slabs and maintain the inter­slab connectivity through coordination to nine oxygen atoms (Fig. 2 ▸c).

View Article: PubMed Central - HTML - PubMed

ABSTRACT

In an attempt to search for mixed alkaline-earth and transition metal pyroborates, the title compound, barium manganese(II) pyroborate, has been synthesized by employing a flux method. The structure of BaMnB2O5 is composed of MnO5 square pyramids that form Mn2O8 dimers by edge-sharing and of pyroborate units ([B2O5]4−) that are composed of two corner-sharing trigonal–planar BO3 units. These building blocks share corners to form ∞2[MnB2O5]2− layers extending parallel to (100). The Ba2+ cations reside in the gap between two manganese pyroborate slabs with a coordination number of nine. The title compound forms an inter­esting spiral framework propagating along the 21 screw axis. The structure is characterized by two alternating layers, which is relatively rare among known transition-metal-based pyroborate compounds.

No MeSH data available.