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New process uses light and gold nanoparticles to hydrogenate carbon dioxide into key chemical feedstock

Unlike most nonimmigrant classifications, which are admitted for a fixed time period, aliens in the F (academic student), J (exchange visitor), and most I (representatives of foreign information media...

Photoredox catalysis driven by visible light has improved chemical synthesis by enabling milder reaction conditions and unlocking distinct reaction mechanisms. Despite the transformative impact, visib...

Nickel(II) dihalide precatalysts with bidentate nitrogen ligands are widely used in cross-coupling reactions, notably in combination with photosensitizers, forming catalytic systems that currently dri...

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Employees at the National Science Foundation say they’ve been blindsided by a plan for the Department of Housing and Urban Development to take over their

Nature Chemistry - Chemical energy conversion and storage rely on the selective movement of protons and electrons, thus understanding these processes is important for applications. Now experiments...

Humanity’s replacement of fossil-fuel energy with renewable electricity will require extensive deployment of lithium batteries, which necessitates an increase in the rate of production of this vital metal. Current extraction methods from brines and ores are very energy-intensive, as are recycling methods. Here we report a novel Li5L2 sandwich structure in which five lithium ions are bound between the azobipyridine groups of two pentagonal ligands. The geometry of these ligands leads to the selectivity for binding Li+ in the presence of Na+ and K+. Upon illumination, the trans-azobipyridine moieties of the ligands isomerize to their cis form, promoting the release of free Li+ as the sandwich comes apart. The selective complexation of Li+, and its photostimulated release, were used as the basis of a cycle for selectively extracting and releasing Li+ ions from a mixture with Na+ and K+. Solar energy may thus be used directly to purify this metal, which is essential for storing increasingly cheap electricity produced through renewable means.