Universität zu Köln

Ahmedi, Sihana, Martynova, Natalia, Giordano, Nico, Hanrath, Michael, Jansen, Martin, Bykov, Maxim ORCID: 0000-0003-0248-1728 and Bruns, Jörn ORCID: 0000-0002-8589-6154 (2025). Ag5Pd2O4, a New Subvalent Silver Oxide, Obtained from Ag2PdO2 via a High-pressure Synthesis. Chemistry – A European Journal, 31 (59). pp. 1-5. Wiley. ISSN 0947-6539

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Abstract

[Artikel-Nr.: e01990] Subvalent silver oxides, where silver exhibits an oxidation state between 0 and + 1, have traditionally been discovered serendipitously due to a lack of systematic synthesis methods and understanding of their bonding schemes. This study presents a novel, purposeful approach to synthesizing multinary subvalent silver oxides through high-pressure techniques. By subjecting the monovalent silver oxide Ag2PdO2 to hydrostatic pressure of ∼30 GPa and laser heating at 1500 K, subvalent Ag5Pd2O4 forms besides PdO. The crystal structure of Ag5Pd2O4, determined via in situ single-crystal X-ray diffraction, reveals distinct layers of cationic silver aggregates and anionic oxopalladate units. Electronic structure calculations confirm the subvalent nature of silver in Ag5Pd2O4, showing a vanished band gap and increased electron density on silver atoms. The findings pave the way for developing materials with rich magneto-electronic functionalities, owing to the interplay between subvalent silver and transition metal cations. Graphical Abstract: Ag5Pd2O4 has been obtained from the reaction of Ag2PdO2 at a hydrostatic pressure of ∼30 GPa and laser heating at 1500 K in a diamond anvil cell (DAC). The new oxide exhibits very short Ag-Ag distances and is subvalent with respect to silver. Quantum chemical calculations describe the new compound as metallic conducting

Item Type:	Article
Creators:	Creators Email ORCID ORCID Put Code Ahmedi, Sihana UNSPECIFIED UNSPECIFIED UNSPECIFIED Martynova, Natalia UNSPECIFIED UNSPECIFIED UNSPECIFIED Giordano, Nico UNSPECIFIED UNSPECIFIED UNSPECIFIED Hanrath, Michael UNSPECIFIED UNSPECIFIED UNSPECIFIED Jansen, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED Bykov, Maxim UNSPECIFIED https://orcid.org/0000-0003-0248-1728 UNSPECIFIED Bruns, Jörn UNSPECIFIED https://orcid.org/0000-0002-8589-6154 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-803069
Identification Number:	10.1002/chem.202501990
Journal or Publication Title:	Chemistry – A European Journal
Volume:	31
Number:	59
Page Range:	pp. 1-5
Number of Pages:	5
Date:	23 October 2025
Publisher:	Wiley
ISSN:	0947-6539
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Theoretical Chemistry
Subjects:	Chemistry and allied sciences
['eprint_fieldname_oa_funders' not defined]:	Publikationsfonds UzK
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/80306