Rubidium sulfide is an inorganic compound and a salt with the chemical formula Rb2S. It is a white solid with similar properties to other alkali metal sulfides.
Structure Rubidium sulfide has a cubic crystal similar to lithium sulfide, sodium sulfide and potassium sulfide, known as the anti-fluorite structure. Their space groups are Fmm. Rubidium sulfide has a crystal lattice unit cell dimension of a = 765.0 pm.
Production By dissolving hydrogen sulfide into rubidium hydroxide solution, it will produce rubidium bisulfide, followed by rubidium sulfide.Wilhelm Blitz, Ernst Wilke-Dörfurt: "Über Sulfide des Rubidiums und Cäsiums" in Zeitschr. f. anorg. Chem. 1906. 48, S. 297–317. VolltextR. Abegg, F. Auerbach: 'Handbuch der anorganischen Chemie'. Verlag S. Hirzel, Bd. 2, 1908. S. 430.Volltext
Reactions Rubidium sulfide reacts with sulfur in hydrogen gas to form rubidium pentasulfide, Rb2S5.Wilhelm Blitz, Ernst Wilke-Dörfurt: Ueber die Pentasulfide des Rubidiums und Cäsiums. In Ber. d. dt. chem. Ges. 1905, 38, 1, S. 123–130, .
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