CESIUM POLYSULFIDES Cs2S(n)

Properties of cesium polysulfides Cs2S(n):

A mixture of Cs2S(n) (n = 2, 3, 5, 6) has a yellow-brown color. All Cs2S(n) - a very solid, melt without decomposition, melts - is a dark brown mobile liquid. Thermal stability decreases with increasing n. Well soluble in water, to a lesser degree (compared to Cs2S), are hydrolyzed by the anion, the solution is colored in dark yellow. Oxidized in air, decomposed by acids. Possess oxidative properties.

 

Obtaining metallic cesium polysulfides Cs2S(n):

Cs2S (solution) (- CsOH)→O2 (air), (time) S(colloid), Cs2(Sn), Cs2SO3S.

Cs2S +(n - 1)S = Cs2(Sn) [boiling].

 

Сhemical reactions with cesium polysulfides Cs2S(n):

Cs2S(n) = Cs2S + (n - 1)S (t>600° C).

Cs2S(n)[diluted] + 12H2O = 2[Cs(H2O)6]+ + Sn2-,

Sn2- + H2O ↔ HSn- + OH-; pKo = 8,30 (n = 5).

Cs2S(n) + 2HCl(diluted) = 2 CsCl + H2S↑ + (n - 1)S↓ (normal temp.),

Cs2S(n) + 2HCl(conc.) = 2 CsCl + H2Sn (-15° C).

2 Cs2S(n) + 2H2O(cold) + O2 = 2nS(colloid) + 4CsOH (In the light).

 

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