Universität zu Köln

Ahmedi, Sihana, Martynova, Natalia, Giordano, Nico, Hanrath, Michael ORCID: 0000-0003-3188-3961, 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 https://orcid.org/0000-0003-3188-3961 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