Die Monoantimonide RbSb und CsSb / The Monoantimonides RbSb and CsSb
2014
Georg von Schnering, Hans | Hönle, Wolfgang | Rrogull, Gabriele
The alkali metal monoantimonides RbSb and CsSb were synthesized from the elements in sealed quartz ampoules. These compounds crystallize in the NaP-type structure (RbSb: P2₁2₁2₁ (No. 19), a = 731.5pm, b = 719.7 pm, c = 1281.5 pm, Z = 8; CsSb: P2₁2₁2₁ (No. 19), a = 757.6 pm, b = 734.5 pm, c = 1327.3 pm, Z = 8). The main feature of the structures are ¹∞[Sb⁻] chains parallel to the 5-axis with bond distances. d̄(Sb-Sb) = 285.8 pm and 285.3 pm, respectively. These bond lengths are discussed in detail relative to those in elementary antimony and to the tetrahedral or covalent radii. The volume increment of Sb⁻ can be derived to be 29.8 cm³ · mole⁻¹.
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