Oxidation state of uranium in A6Cu12U2S15 (A = K, Rb, Cs) compounds

Inorganic Chemistry
Christos D MalliakasJames A Ibers

Abstract

Black single crystals of A(6)Cu(12)U(2)S(15) (A = K, Rb, Cs) have been synthesized by the reactive flux method. These isostructural compounds crystallize in the cubic space group Ia ̅3d at room temperature. The structure comprises a three-dimensional framework built from US(6) octahedra and CuS(3) trigonal planar units with A cations residing in the cavities. There are no S-S bonds in the structure. To elucidate the oxidation state of U in these compounds, various physical property measurements and characterization methods were carried out. Temperature-dependent electrical resistivity measurement on a single crystal of K(6)Cu(12)U(2)S(15) showed it to be a semiconductor. These three A(6)Cu(12)U(2)S(15) (A = K, Rb, Cs) compounds all exhibit small effective magnetic moments, < 0.58 μ(B)/U and band gaps of about 0.55(2) eV in their optical absorption spectra. From X-ray absorption near edge spectroscopy (XANES), the absorption edge of A(6)Cu(12)U(2)S(15) is very close to that of UO(3). Electronic band structure calculations at the density functional theory (DFT) level indicate a strong degree of covalency between U and S atoms, but theory was not conclusive about the formal oxidation state of U. All experimental data suggest that ...Continue Reading

References

Oct 15, 1996·Physical Review. B, Condensed Matter·G Kresse, J Furthmüller
Jan 1, 1993·Physical Review. B, Condensed Matter·G Kresse, J Hafner
Feb 15, 2001·Physical Review Letters·A B Shick, W E Pickett
Oct 10, 2002·Journal of the American Chemical Society·Pantelis N TrikalitisMercouri G Kanatzidis
May 3, 2003·Journal of Colloid and Interface Science·G AtunM Muhler
Jun 22, 2005·Journal of Synchrotron Radiation·B Ravel, M Newville
Apr 11, 2006·Inorganic Chemistry·Hiroshi MizoguchiJames A Ibers
Jul 28, 2007·Inorganic Chemistry·Danielle L GrayJames A Ibers
Dec 25, 2007·Acta Crystallographica. Section A, Foundations of Crystallography·George M Sheldrick
May 6, 2008·Nucleic Acids Research·Roland PfohGeorge M Sheldrick
Apr 14, 2010·Dalton Transactions : an International Journal of Inorganic Chemistry·Daniel E Bugaris, James A Ibers
Jan 1, 2009·Acta Crystallographica. Section E, Structure Reports Online·Daniel M WellsJames A Ibers

❮ Previous
Next ❯

Citations

Sep 6, 2013·Inorganic Chemistry·Matthew D WardJames A Ibers
Mar 10, 2017·Inorganic Chemistry·Mercouri G Kanatzidis
Feb 26, 2014·Inorganic Chemistry·Adel MesbahJames A Ibers
Aug 30, 2014·Advanced Materials·Wei-Qun ShiZhi-Fang Chai
Dec 8, 2020·Chemistry : a European Journal·Kristen A PaceHans-Conrad Zur Loye
Aug 14, 2020·Journal of the American Chemical Society·Logan S BretonHans-Conrad Zur Loye
Aug 17, 2018·Inorganic Chemistry·Vladislav V Klepov, Hans-Conrad Zur Loye

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.