Take five: the isotypic structures of Y2WO6 and Ho2WO6 comprising non-condensed [WO5]4− units

Ingo Hartenbach; Tanja Schustereit

doi:10.1515/znb-2025-0006

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Take five: the isotypic structures of Y₂WO₆ and Ho₂WO₆ comprising non-condensed [WO₅]⁴⁻ units

Ingo Hartenbach and Tanja Schustereit

Published/Copyright: March 14, 2025

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From the journal Zeitschrift für Naturforschung B Volume 80 Issue 3-4

Abstract

Solvochemical syntheses attempts to obtain fluoride oxidotungstates of yttrium and holmium yielded coarse single crystals of Y₂WO₆ and Ho₂WO₆. Both compounds crystallize isotypically in the monoclinic space group C2/c (a ≈ 1621, b ≈ 1100, c ≈ 535 pm; β ≈ 107.5°) with eight formula units per unit cell. The crystal structure contains three crystallographically distinguishable rare earth metal cations, which all exhibit a coordination number of eight in shapes between twisted tetragonal prisms and trigonal dodecahedra. The hexavalent tungsten cations are surrounded by five of the six crystallographically different oxide anions forming isolated, i.e. non-condensed, trigonal bipyramids that show a very strong distortion. The sixth oxygen atom is tetrahedrally coordinated by rare earth metal (RE) cations with the resulting [ORE₄] tetrahedra building up ∞ 1 { [ O R E 2 2 / 4 R E 3 2 / 2 ] 2.5 + } bands along [001]. These bands are arranged according to a hexagonal rod packing with the (RE1)³⁺ cations and the [WO₅]⁴⁻ anions being situated between them.

Keywords: yttrium; holmium; tungstates; crystal structure

Corresponding author: Ingo Hartenbach, Institute of Inorganic Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany, E-mail: ingo.hartenbach@iac.uni-stuttgart.de

Dedicated to Professor Hans-Jörg Deiseroth on the Occasion of his 80th Birthday.

Acknowledgments

The authors thank Dr. Falk Lissner for the single-crystal X-ray measurements and the state of Baden-Württemberg (Stuttgart, Germany) for financial support.

Research ethics: Not applicable.
Informed consent: Not applicable.
Author contributions: TS was responsible for the synthesis and the crystal structure analysis of the compounds, IH provided supervision, conceptionalized and finalized the publication.
Use of Large Language Models, AI and Machine Learning Tools: None declared.
Conflict of interest: The authors declare no conflict of interest.
Research funding: None declared.
Data availability: Data are available upon request with the corresponding author.

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Received: 2025-01-24

Accepted: 2025-02-14

Published Online: 2025-03-14

Published in Print: 2025-03-26

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https://doi.org/10.1515/znb-2025-0006

Keywords for this article

yttrium; holmium; tungstates; crystal structure