Die Kristallstrukturen der Hydroxyhalogenide Li4(OH)3Br und Li4(OH)3I

The Crystal Structures of the Lithium Hydroxide Halides Li₄(OH)₃Br and Li₄(OH)₃I Using single crystal analysis and powder diffraction data the crystal structures of the lithium hydroxide halides Li₄(OH)₃Br and Li₄(OH)₃I were solved and refined. Li₄(OH)₃Br crystallises in the space group P2₁/m and is isotypic with the lighter homologue Li₄(OH)₃Cl. (Rietveld‐refinement; T = 293 K; a = 545, 41(1); b = 758, 13(1); c = 650, 20(1) pm; β = 93, 82(1)°; Z = 2; 300 unique reflections; R_p = 0, 106; R_wp = 0, 109; R_exp = 0, 081). Li₄(OH)₃I crystallises in the space group Pmmn in a variant of the LiOH structure in which 1/4 of the hydroxide anions are replaced by iodide anions. (Single crystal analysis; T = 100 K; a = 1029, 5(4); b = 525, 9(2); c = 573, 2(2) pm; Z = 2; 392 unique reflections; R₁ = 0, 0642).