New Superatom Is Both Stable and Magnetic

New Superatom Is Both Stable and Magnetic

energy, Materials Science
JACS Spotlights March 22, 2022 Superatoms are small symmetric clusters of atoms with electronic states bunched together into closely packed shells. Like their individual-atom counterparts, superatoms with filled shells have the greatest electronic stability. Typical stable octahedral transition metal chalcogenide clusters have a single set of filled electron shells and they have no net spin magnetic moment outside an applied field.Now, Amymarie Bartholomew, Xavier Roy, Shiv Khanna, and co-workers have theoretically predicted a new type of cluster that would uniquely combine high stability and a large spin magnetic moment (DOI: 10.1021/jacs.2c00731). This theoretical cluster has two subshells: one with 57 valence electrons and one with 50, optimal numbers of electrons to create a large gap between the highest occupied and lowest unoccupied orbitals. They synthesized this new cluster, [NEt4]5[Fe6S8(CN)6], which…
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Nanoparticle Assembly: Expanding the Realm of the Possible

Nanoparticle Assembly: Expanding the Realm of the Possible

emerging technologies, Materials Science
JACS Spotlights Feb. 22, 2022 Nanoparticles assemble themselves into a multitude of compositions and structures, and the range of possible applications appears almost limitless. Robert Macfarlane and co-workers give an overview of the history and current state of nanoparticle assembly research, focusing on assembly approaches and emergent properties of the resulting materials and summarizing future directions and challenges (DOI: 10.1021/jacs.1c12335). The simplest assembly process, uncontrolled aggregation of nanoparticles into disordered clusters or films, is used on an industrial scale to produce coatings. Supramolecular assembly techniques (in various stages of development) direct nanoparticles to form ordered patterns, self-healing nanocomposites, vesicles, micelles, or thin films. Light, magnetic fields, or biomolecular templates can direct nanoparticles to produce even more complex structures. The resulting materials interact with light, electrons, and magnetic fields in ways…
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