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Rb 2 SiAs 2  was found as a byproduct in the course of the RbAs synthesis in a quartz container. The direct synthesis from the elements yields pure samples w-ithin 5 h at 925 K. Rb 2 SiAs 2  forms transparent red needle-shaped crystals which split to bunches of golden, reflecting fibres. The compound is sensitive against moisture. Rb 2 SiAs 2  is isotypic to K 2 SiP 2  with a polyanionic chain [SiAs 2 ] 2-  of edge-connected tetrahedra (isostructural and isoelectronic to SiS 2 ) formed in a dis­torted cubic closed packed As arrangement, and with Rb in the octahedral holes (Ibam. No. 72; a = 726.6(5), b = 1377.1(6), c = 638.9(3) pm; Z = 4: Si−As = 238.1 pm; As−Si−As = 95.7° and Si−As−Si = 84.3° in the four membered Si 2 As 2  rings).

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Rubidium-diarsasilicat(IV) Rb 2 SiAs 2 , ein Derivat der SiS 2 -Struktur / Rubidium Diarsasilicate(IV) Rb 2 SiAs 2 , a Derivative of the SiS 2  Structure Type