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The synthetic cobalt vanadium selenite, Co?V?Se?O??.

ABSTRACT: The crystal structure of dicobalt(II) divanadium(V) disel-enium(IV) undeca-oxide, Co?V?Se?O??, exhibits a three-dimensional framework, the building units being distorted CoO? octa-hedra and VO? square pyramids arranged so as to form alternate chains along [010]. The framework has channels along [100] and [010] in which the two ?-SeO?E (site symmetries m; E being the 4s² lone electron pair of Se(IV)) tetra-hedra reside and connect to the other building blocks. The structure contains corner- and edge-sharing CoO? octa-hedra, corner- and edge-sharing VO? square pyramids and edge-sharing ?-SeO?E tetra-hedra. Co?V?Se?O?? is the first oxide containing all the cations Co(II), V(V) and Se(IV).

SUBMITTER: Rabbani F

PROVIDER: S-EPMC3393144 | biostudies-literature | 2012 Jul

REPOSITORIES: biostudies-literature

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The synthetic cobalt vanadium selenite, Co₂V₂Se₂O₁₁.

Rabbani Faiz F Zimmermann Iwan I Johnsson Mats M

Acta crystallographica. Section E, Structure reports online 20120630 Pt 7

The crystal structure of dicobalt(II) divanadium(V) disel-enium(IV) undeca-oxide, Co₂V₂Se₂O₁₁, exhibits a three-dimensional framework, the building units being distorted CoO₆ octa-hedra and VO₅ square pyramids arranged so as to form alternate chains along [010]. The framework has channels along [100] and [010] in which the two Ψ-SeO₃E (site symmetries m; E being the 4s² lone electron pair of Se(IV)) tetra-hedra reside and connect to the other building blocks. The structure contains corner- and e ...[more]

PMID: 22807701

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Project description:A wide range of microorganisms have been shown to transform selenium-containing oxyanions to reduced forms of the element, particularly selenium-containing nanoparticles. Such reactions are promising for the detoxification of environmental contamination and the production of valuable selenium-containing products, such as nanoparticles for application in biotechnology. It has previously been shown that aerobic methane-oxidizing bacteria, including Methylococcus capsulatus (Bath), are able to perform the methane-driven conversion of selenite (SeO3 2-) to selenium-containing nanoparticles and methylated selenium species. Here, the biotransformation of selenite by Mc . capsulatus (Bath) has been studied in detail via a range of imaging, chromatographic, and spectroscopic techniques. The results indicate that the nanoparticles are produced extracellularly and have a composition distinct from that of nanoparticles previously observed from other organisms. The spectroscopic data from the methanotroph-derived nanoparticles are best accounted for by a bulk structure composed primarily of octameric rings in the form Se8 - x S x with an outer coat of cell-derived biomacromolecules. Among a range of volatile methylated selenium and selenium-sulfur species detected, methyl selenol (CH3SeH) was found only when selenite was the starting material, although selenium nanoparticles (both biogenic and chemically produced) could be transformed into other methylated selenium species. This result is consistent with methyl selenol being an intermediate in the methanotroph-mediated biotransformation of selenium to all the methylated and particulate products observed.IMPORTANCE Aerobic methane-oxidizing bacteria are ubiquitous in the environment. Two well-characterized strains, Mc . capsulatus (Bath) and Methylosinus trichosporium OB3b, representing gamma- and alphaproteobacterial methanotrophs, respectively, can convert selenite, an environmental pollutant, to volatile selenium compounds and selenium-containing particulates. Both conversions can be harnessed for the bioremediation of selenium pollution using biological or fossil methane as the feedstock, and these organisms could be used to produce selenium-containing particles for food and biotechnological applications. Using an extensive suite of techniques, we identified precursors of selenium nanoparticle formation and also found that these nanoparticles are made up of eight-membered mixed selenium and sulfur rings.

Dataset Information

The synthetic cobalt vanadium selenite, Co?V?Se?O??.

Publications

The synthetic cobalt vanadium selenite, Co₂V₂Se₂O₁₁.

Similar Datasets

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