Revisiting the Crystal Structure of Layered Oxychalcogenides Ln₂O₂S₂ (Ln = La, Pr, and Nd) Article Swipe

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Louis-Béni Mvélé , Shunsuke Sasaki , Camille Latouche , Philippe Deniard , Étienne Janod , Isabelle Braems , Stéphane Jobic , Laurent Cario ·

YOU? · · 2023 · Open Access · · DOI: https://doi.org/10.1021/acs.inorgchem.3c00147

La₂O₂S₂ was recently used as a precursor to prepare either a new metastable form of La₂O₂S by de-insertion of half of sulfur atoms of (S₂) dimers or quaternary compounds by insertion of a coinage metal (e.g., La₂O₂Cu₂S₂). A strong structural relationship exists between the polysulfide precursor and the synthesized products, which highlights the topochemical nature of these reactions. Nevertheless, the crystal structure of the precursor material is still a matter of debate. Namely, several structural models were reported so far in the literature with different space groups and/or crystal systems. All these models were built upon infinite [Ln₂O₂] slabs separated from each other by a flat sulfur layer of (S₂) dumbbells. Nevertheless, all (S₂) dimers within a given sulfur layer may rotate in phase by 90° compared to the ideal model that induces an overall atomic disorder in (S₂) dimer orientation along the stacking axis. This leads to some imbroglio and much confusion in the description of structural arrangement of Ln₂O₂S₂ materials. Herein, the crystal structures of La₂O₂S₂ and its Pr and Nd variants are revisited. We propose an alternative model that reconciles pre-existing structural descriptions of Ln₂O₂S₂ (Ln = La, Pr, and Nd) materials and highlights the strong dependency of the degree of long-range ordering of the sulfur layers on the synthesis conditions.

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Chemistry Crystallography Metastability Stacking Dimer Crystal structure Sulfur Crystal (programming language) Confusion Organic chemistry Computer science Psychoanalysis Programming language Psychology

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Type: article
Language: en
Landing Page: https://doi.org/10.1021/acs.inorgchem.3c00147
OA Status: green
Cited By: 7
References: 17
Related Works: 10
OpenAlex ID: https://openalex.org/W4367835314

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DOI: https://doi.org/10.1021/acs.inorgchem.3c00147

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Title: Revisiting the Crystal Structure of Layered Oxychalcogenides Ln₂O₂S₂ (Ln = La, Pr, and Nd)

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Language: en

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Publication year: 2023

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Publication date: 2023-05-03

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Authors: Louis-Béni Mvélé, Shunsuke Sasaki, Camille Latouche, Philippe Deniard, Étienne Janod, Isabelle Braems, Stéphane Jobic, Laurent Cario

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Landing page: https://doi.org/10.1021/acs.inorgchem.3c00147

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Concepts: Chemistry, Crystallography, Metastability, Stacking, Dimer, Crystal structure, Sulfur, Crystal (programming language), Confusion, Organic chemistry, Computer science, Psychoanalysis, Programming language, Psychology

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Cited by: 7

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Revisiting the Crystal Structure of Layered Oxychalcogenides Ln2O2S2 (Ln = La, Pr, and Nd) Article Swipe

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Revisiting the Crystal Structure of Layered Oxychalcogenides Ln₂O₂S₂ (Ln = La, Pr, and Nd) Article Swipe