Abstract
A new erbium–selenium oxychloride, ErSeO 3Cl, has been synthesized hydrothermally starting from ErCl 3·6H 2O and SeO 2 in LiCl aqueous solution, and its crystal structure solved from single-crystal X-ray diffraction data. ErSeO 3Cl crystallizes in the HoTeO 3Cl structure type in the orthorhombic system, space group Pnma (No. 62), with the cell parameters a=7.185(1) A ̊ , b=6.890(1) A ̊ , c=8.720(2) A ̊ , V=431.7(1) A ̊ 3 , Z=4. The structure was refined to R1=0.0259, w R2=0.0648 for 35 variables and 508 unique reflections. The 3D structure of ErSeO 3Cl is formed from linked ErO 5Cl 2 polyhedra and SeO 3E (E—lone electron pair) polyhedra. We compare the crystal structure of ErSeO 3Cl with the structures of other known rare-earth (Bi)–Se(Te) oxyhalides of the common formula MChO 3 X ( M= Ln(Bi), Ch=Se, Te, X=Cl, Br, I).
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