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  Formation of Tetraselenodiarsenate(II) Anions in Ultra-alkaline Medium

Albrecht, R., Jach, F., & Ruck, M. (2021). Formation of Tetraselenodiarsenate(II) Anions in Ultra-alkaline Medium. Zeitschrift für anorganische und allgemeine Chemie, 647, 1-6. doi:10.1002/zaac.202100306.

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 Creators:
Albrecht, Ralf1, Author
Jach, Franziska2, Author              
Ruck, Michael3, Author              
Affiliations:
1External Organizations, ou_persistent22              
2Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
3Michael Ruck, Max Planck Fellow, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863444              

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 Abstract: SeO2 and As2O3 were reacted at 200 degrees C in in a potassium hydroxide hydroflux with a molar water-base ratio n(H2O) : n(KOH)=1.8. Arsenate(III) disproportionates under these conditions into arsenate(V) and elemental arsenic. The reduction also yielded tetraselenodiarsenate(II) anions, which turned the solution yellow and precipitated at room temperature as plate-shaped crystals of K-4(As2Se4) . 2H(2)O. The unexpected redox reaction as well as the formation of a hygroscopic compound in an aqueous solution are attributed to a strongly reduced activity of water in ultra-alkaline media. K-4(As2Se4) . 2H(2)O crystallizes in the orthorhombic space group Cmce with lattice parameters a=784.78(3), b=1027.76(4) and c=1750.63(7) pm at 100 K. The (As2Se4)(4-) anion has C-2h symmetry and an As-As bond length of 245.3(1) pm. The water molecules are part of infinite zig-zag chains infinity 1 [K(H2O)(2/2)](+) and form hydrogen bonds to neighboring selenium atoms.

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Language(s): eng - English
 Dates: 2021-11-212021-11-21
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000723550900001
DOI: 10.1002/zaac.202100306
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Title: Zeitschrift für anorganische und allgemeine Chemie
  Other : J. Inorg. Gen Chem.
  Other : Journal of Inorganic and General Chemistry
  Abbreviation : Z. Anorg. Allg. Chem.
Source Genre: Journal
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Publ. Info: Leipzig, Weinheim : Verlag Johann Ambrosius Barth / Wiley-VCH
Pages: - Volume / Issue: 647 Sequence Number: - Start / End Page: 1 - 6 Identifier: Other: 1521-3749
ISSN: 0044-2313
CoNE: https://pure.mpg.de/cone/journals/resource/954925453895