Formation of Tetraselenodiarsenate(II) Anions in Ultra‐alkaline Medium
نویسندگان
چکیده
SeO2 and As2O3 were reacted at 200 °C in a potassium hydroxide hydroflux with molar water-base ratio n(H2O) : n(KOH)=1.8. Arsenate(III) disproportionates under these conditions into arsenate(V) elemental arsenic. The reduction also yielded tetraselenodiarsenate(II) anions, which turned the solution yellow precipitated room temperature as plate-shaped crystals of K4(As2Se4) ⋅ 2H2O. unexpected redox reaction well formation hygroscopic compound an aqueous are attributed to strongly reduced activity water ultra-alkaline media. 2H2O crystallizes orthorhombic space group Cmce lattice parameters a=784.78(3), b=1027.76(4) c=1750.63(7) pm 100 K. (As2Se4)4− anion has C2h symmetry As−As bond length 245.3(1) pm. molecules part infinite zig-zag chains [K(H2O)2/2]+ form hydrogen bonds neighboring selenium atoms.
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ژورنال
عنوان ژورنال: Zeitschrift für anorganische und allgemeine Chemie
سال: 2021
ISSN: ['0044-2313', '1521-3749']
DOI: https://doi.org/10.1002/zaac.202100306