Abstract
Partial oxidation of NaCrS 2 in neutral aqueous electrolyte solutions results in the topotactic formation of the hydrated phase Na + x (H 2O) y [CrS 2] x− which consists of negatively charged [CrS 2] x− layers with solvated mobile alkali ions between the chromium sulfide sheets. Cation- and water-exchange reactions demonstrate the polyelectrolyte character of this compound. Electrochemical investigations by galvanostatic methods showed that on oxidation 0.6 e − are transferred from the layers resulting in a value of x = 0.4 in the oxidized state; the process is reversible in the range of 0.7 ⩾ x ⩾ 0.4. The product obtained on oxidation in acid electrolytes, described in earlier studies as “CrS 2,” was found to be a hydrogen phase H 0.3CrS 2 which exhibits Brønsted acid character and forms Lewis base intercalation compounds. The chemical reactivity of KCrS 2 which is isotypic with NaCrS 2 is similar to that of the sodium form.
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