Cs2S5 · H2O has been synthesized from aqueous solutions of Cs2S and stoichiometric quantities of sulfur. Cs2S solutions result from the reaction between Ba(OH)2·8H20, Cs2SO4, and H2S.
Cs2S5-H2O crystallizes triclinicly, space group P1̄ , with Z = 2. The lattice constants are as follows:
a = 6.974(3) Å, b = 7.870(4) Å, c = 10.413(4) Å, α = 108.72(4)°, β = 111,23(4)°, γ = 82,00(4)°.
Characteristic features are the unbranched zig-zag-chains of S52- like in other known pentachalcogenides M2X5. Hydrogen bridges occur between the terminal sulfur atoms of the chains and the oxygen atoms of water molecules.
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