The structures of the compounds LiP and KSb have been redetermined with single crystal diffractometer data. They are isotypic with LiAs (space group P 2 1 / c ; LiP: a = 558.2pm; b = 494.0pm; c = 1025.5pm; β = 118.15°; 564 reflections hkl ; R = 0.021; KSb: a = 715.6pm; b = 691.7pm; c = 1335.5 pm; β = 115.17°; 1115 reflections hkl ; R = 0.028). The structures are characterized by one-dimensional infinite ∞ 1 [Y - ] helices with d (P–P) = 220.5 and 222.4pm and d (Sb–Sb) = 282.9 and 285.2pm, respectively. The alcali metal atoms are surrounded by a distorted octahedron of Y atoms with đ (Li–P) = 268 pm and đ (K–Sb) = 362 pm.
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