Published In
Inorganic Chemistry
Document Type
Pre-Print
Publication Date
8-12-2024
Subjects
Chemical structures -- Chalcogenides
Abstract
Three new NaBa2M3Q3(Q2) (M = Ag or Cu; Q = S or Se) chalcogenides were prepared by using solid-state methods and structurally characterized by using single-crystal X-ray diffraction. NaBa2Ag3Se3(Se2) and NaBa2Cu3Se3(Se2) crystallize in monoclinic space group C2/m and have a two-dimensional structure composed of edge-sharing MSe4/4 tetrahedra separated by Na+ and Ba2+ cations, along with (Se2)2– dimers at the center of the spacings between [M3Se3]3– slabs. NaBa2Ag3S3(S2) adopts a related structure with space group C2/m but has additional, crystallographically distinct Ag atoms in the [Ag3S3]3– layer that are linearly coordinated. NaBa2Ag3Se3(Se2) and NaBa2Ag3S3(S2) have indirect band gaps measured to be 1.2 and 1.9 eV, respectively, which is supported by band structures calculated using density functional theory. Mixed-anion NaBa2Cu3Se5–xSx compositions were prepared to probe the presence of anion ordering and heteronuclear (S–Se)2– dimers. Structural analyses of the sulfoselenides indicate that selenium preferentially occupies the Q–Q dimer sites, while Raman spectroscopy reveals a mixture of (S2), (Se2), and heteronuclear (S–Se) units in the sulfur-rich products. The local ordering of the chalcogens is rationalized using simple bonding concepts and adds to a growing framework for understanding ordering phenomena in mixed-anion systems.
Rights
Copyright © 2024 the Authors
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DOI
10.1021/acs.inorgchem.4c00534
Persistent Identifier
https://archives.pdx.edu/ds/psu/42514
Citation Details
Tassanov, A., Lee, H., Xia, Y., & Hodges, J. M. (2024). Layered NaBa2M3Q3(Q2) (M = Cu or Ag; Q = S or Se) Chalcogenides and Local Ordering in Their Mixed-Anion Compositions. Inorganic Chemistry, 63(34), 15584–15591.
Description
This is the author’s version of a work that was accepted for publication. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published as: Chalcogenides and Local Ordering in Their Mixed-Anion Compositions. Inorganic Chemistry, 63(34), 15584–15591.