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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.

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(a) Perspective view of the structure of BaMnB2O5 viewed along the c axis. The wavy and dotted line (left) indicates the zigzag arrays of Ba atoms. Only one Ba atom with bonds is drawn for clarity, demonstrating the function of Ba—O bonds with regard to holding neighboring [MnB2O5]2− slabs. (b) Polyhedral representation showing the 2∞[MnB2O5]2− spiral framework centered around the 21 screw axis of the unit cell. (c) Polyhedral representation showing the arrangement of isolated pyroborate units viewed approximately along the [101] direction.
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fig1: (a) Perspective view of the structure of BaMnB2O5 viewed along the c axis. The wavy and dotted line (left) indicates the zigzag arrays of Ba atoms. Only one Ba atom with bonds is drawn for clarity, demonstrating the function of Ba—O bonds with regard to holding neighboring [MnB2O5]2− slabs. (b) Polyhedral representation showing the 2∞[MnB2O5]2− spiral framework centered around the 21 screw axis of the unit cell. (c) Polyhedral representation showing the arrangement of isolated pyroborate units viewed approximately along the [101] direction.

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) Perspective view of the structure of BaMnB2O5 viewed along the c axis. The wavy and dotted line (left) indicates the zigzag arrays of Ba atoms. Only one Ba atom with bonds is drawn for clarity, demonstrating the function of Ba—O bonds with regard to holding neighboring [MnB2O5]2− slabs. (b) Polyhedral representation showing the 2∞[MnB2O5]2− spiral framework centered around the 21 screw axis of the unit cell. (c) Polyhedral representation showing the arrangement of isolated pyroborate units viewed approximately along the [101] direction.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig1: (a) Perspective view of the structure of BaMnB2O5 viewed along the c axis. The wavy and dotted line (left) indicates the zigzag arrays of Ba atoms. Only one Ba atom with bonds is drawn for clarity, demonstrating the function of Ba—O bonds with regard to holding neighboring [MnB2O5]2− slabs. (b) Polyhedral representation showing the 2∞[MnB2O5]2− spiral framework centered around the 21 screw axis of the unit cell. (c) Polyhedral representation showing the arrangement of isolated pyroborate units viewed approximately along the [101] direction.
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.


Related in: MedlinePlus