Abstract
The ternary title compound, dipotassium lanthanum pentachloride, K2LaCl5, is isotypic with Y2HfS5 and various ternary rare-earth metal(III) halides with the general formula A 2 MX 5 (A = NH4, InI, Na–Cs; M = La–Dy; X = Cl–I). The La3+ cations and three of the four symmetry-independent chloride anions are located on a crystallographic mirror plane. The La3+ cations are surrounded by seven chloride anions, each in the shape of a monocapped trigonal prism, whereas the coordination spheres of the K+ cations exhibit one more cap. Three of the four independent chloride anions reside in a fivefold cationic coordination, leading to distorted square pyramids. The fourth chloride anion has only four cationic neighbours, forming no specific polyhedron.
Highlights
The ternary title compound, dipotassium lanthanum pentachloride, K2LaCl5, is isotypic with Y2HfS5 and various ternary rare-earth metal(III) halides with the general formula A2MX5
The La3+ cations and three of the four symmetry-independent chloride anions are located on a crystallographic mirror plane
Cations are surrounded by seven chloride anions, each in the shape of a monocapped trigonal prism, whereas the coordination spheres of the K+ cations exhibit one more cap
Summary
Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569. Germany, and bDepartment für Chemie, Institut für Anorganische Chemie, Universität zu Köln, Greinstrasse 6, 50939 Köln, Germany. R factor = 0.059; wR factor = 0.142; data-to-parameter ratio = 37.5. The La3+ cations and three of the four symmetry-independent chloride anions are located on a crystallographic mirror plane. Cations are surrounded by seven chloride anions, each in the shape of a monocapped trigonal prism, whereas the coordination spheres of the K+ cations exhibit one more cap. Three of the four independent chloride anions reside in a fivefold cationic coordination, leading to distorted square pyramids. The fourth chloride anion has only four cationic neighbours, forming no specific polyhedron. Our thanks go to Dr. Falk Lissner for the data collection
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