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Open AccessArticle

The Structural Dimorphism of Lanthanum Oxide Fluoride Selenide La2OF2Se

Institute for Inorganic Chemistry, University of Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
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Crystals 2019, 9(9), 435; https://doi.org/10.3390/cryst9090435
Received: 17 July 2019 / Revised: 1 August 2019 / Accepted: 16 August 2019 / Published: 21 August 2019
(This article belongs to the Special Issue Rare-Earth Metal Compounds)
The new colorless lanthanum oxide fluoride selenide La2OF2Se could be synthesized via solid-state reactions in two different structure types. Lamellar crystals of A-La2OF2Se were obtained from mixtures of La, LaF3, La2O3 and Se in molar ratios of 2:2:1:3 with NaCl as flux for seven days in silica-protected sealed tantalum capsules at 850 °C. Needle-shaped crystals of B‑La2OF2Se emerged from reactions of the same educt mixtures in molar ratios of 6:4:4:9 scheduled to produce La6O4F4Se3 with CsI as flux for four days in niobium ampoules at 700 °C. The A‑type form of La2OF2Se crystallizes in the trigonal space group R 3 ¯ m with a = 418.13(3) and c = 4478.2(4) pm for Z = 6, whereas the B‑type form is hexagonal (space group: P63/m) with a = 1396.82(9) and c = 401.08(3) pm for Z = 6. The crystal structure of A-La2OF2Se shows a close relationship to the fluoride-free La2O2Se and the oxygen-free La2F4Se. It can even be discussed as 1:1 intergrowth variety, since it contains the [LaO4Se3]11− and [LaF7Se3]10− polyhedra typical for the ternaries. B-La2OF2Se appears to be structurally very similar to La6O2F8Se3 in displaying [LaO3FSe4]12− and [LaOF6Se2]9− polyhedra. With 6.039 versus 6.036 g/cm3 the B-type form of La2OF2Se is slightly denser than the A-type variant. View Full-Text
Keywords: lanthanum oxide fluoride selenides; polymorphism; X-ray diffraction; crystal structure; rare-earth metal compounds lanthanum oxide fluoride selenides; polymorphism; X-ray diffraction; crystal structure; rare-earth metal compounds
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Buyer, C.; Grossholz, H.; Schleid, T. The Structural Dimorphism of Lanthanum Oxide Fluoride Selenide La2OF2Se. Crystals 2019, 9, 435.

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