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Crystal structure of BaMnB₂O₅ containing structurally isolated manganese oxide sheets.

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 inter-esting 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.

SUBMITTER: Maschmeyer EM

PROVIDER: S-EPMC5120715 | biostudies-literature | 2016 Sep

REPOSITORIES: biostudies-literature

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Crystal structure of BaMnB2O5 containing structurally isolated manganese oxide sheets.

Maschmeyer Elizabeth M EM Sanjeewa Liurukara D LD Ranmohotti Kulugammana G S KG

Acta crystallographica. Section E, Crystallographic communications 20160819 Pt 9

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 buildin ...[more]

PMID: 27920925

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Project description:Manganese-oxidizing bacteria in the aquatic environment have been comprehensively investigated. However, little information is available about the distribution and biogeochemical significance of these bacteria in terrestrial soil environments. In this study, stratified soils were initially examined to investigate the community structure and diversity of manganese-oxidizing bacteria. Total 344 culturable bacterial isolates from all substrata exhibited Mn(II)-oxidizing activities at the range of 1 µM to 240 µM of the equivalent MnO2. The high Mn(II)-oxidizing isolates (>50 mM MnO2) were identified as the species of phyla Actinobacteria, Firmicutes and Proteobacteria. Seven novel Mn(II)-oxidizing bacterial genera (species), namely, Escherichia, Agromyces, Cellulomonas, Cupriavidus, Microbacterium, Ralstonia, and Variovorax, were revealed via comparative phylogenetic analysis. Moreover, an increase in the diversity of soil bacterial community was observed after the combined enrichment of Mn(II) and carbon-rich complex. The phylogenetic classification of the enriched bacteria represented by predominant denaturing gradient gel electrophoresis bands, was apparently similar to culturable Mn(II)-oxidizing bacteria. The experiments were further undertaken to investigate the properties of the Mn oxide aggregates formed by the bacterial isolates with high Mn(II)-oxidizing activity. Results showed that these bacteria were closely encrusted with their Mn oxides and formed regular microspherical aggregates under prolonged Mn(II) and carbon-rich medium enrichment for three weeks. The biotic oxidation of Mn(II) to Mn(III/IV) by these isolates was confirmed by kinetic examinations. X-ray diffraction assays showed the characteristic peaks of several Mn oxides and rhodochrosite from these aggregates. Leucoberbelin blue tests also verified the Mn(II)-oxidizing activity of these aggregates. These results demonstrated that Mn oxides were formed at certain amounts under the enrichment conditions, along with the formation of rhodochrosite in such aggregates. Therefore, this study provides insights into the structure and diversity of soil-borne bacterial communities in Mn(II)-oxidizing habitats and supports the contribution of soil-borne Mn(II)-oxidizing bacteria to Mn oxide mineralization in soils.

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Crystal structure of BaMnB₂O₅ containing structurally isolated manganese oxide sheets.

Publications

Crystal structure of BaMnB<sub>2</sub>O<sub>5</sub> containing structurally isolated manganese oxide sheets.

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