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• W3042590204 abstract "Abstract Atomic dispersion of dopants and control over their defect chemistry are central goals in the development of oxide nanoparticles for functional materials with dedicated electronic, optical or magnetic properties. We produced highly dispersed oxide nanocubes with atomic distribution of cobalt ions in substitutional sites of the MgO host lattice via metal organic chemical vapor synthesis. Vacuum annealing of the nanoparticle powders up to 1173 K has no effect on the shape of the individual particles and only leads to moderate particle coarsening. Such materials processing, however, gives rise to the electronic reduction of particle surfaces, which—upon O 2 admission—stabilize anionic oxygen radicals that are accessible to UV/Vis diffuse reflectance and electron paramagnetic resonance (EPR) spectroscopy. Multi‐reference quantum chemical calculations show that the optical bands observed mainly originate from transitions into 4 A 2 g ( 4 F), 4 T 1 g ( 4 P) states with a contribution of transitions into 2 T 1 g , 2 T 2 g ( 2 G) states through spin‐orbit coupling and gain intensity through vibrational motion of the MgO lattice or the asymmetric ion field. Related nanostructures are a promising material system for single atomic site catalysis. At the same time, it represents an extremely valuable model system for the study of interfacial electron transfer processes that are key to nanoparticle chemistry and photochemistry at room temperature, and in heterogeneous catalysis." @default.
• W3042590204 created "2020-07-23" @default.
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• W3042590204 date "2020-10-19" @default.
• W3042590204 modified "2023-10-16" @default.
• W3042590204 title "Isolated Cobalt Ions Embedded in Magnesium Oxide Nanostructures: Spectroscopic Properties and Redox Activity" @default.
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• W3042590204 doi "https://doi.org/10.1002/chem.202002817" @default.
• W3042590204 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7756418" @default.
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