Chemo- and stereoselective intermolecular [2 + 2] photocycloaddition of conjugated dienes using colloidal nanocrystal photocatalysts

Entropy-Gated Thermally Activated Delayed Emission Lifetime in Phenanthrene-Functionalized CsPbBr3 Perovskite Nanocrystals

“…Following excitation at the NC, the reactant state is labeled as NC*– m M (Figure b). The NC excitonic state is labeled as NC* rather than 3 NC* due to a strong spin–orbit coupling in NCs rendering the spin quantum number ill-defined, , but it has been definitively shown that molecular triplet sensitization using NC* is feasible, ,, a process with important applications in photon upconversion ,, and organic synthesis. , Following TET, the product state is NC– 3 M*­( m – 1)­M. Here we only consider the case that the NC is excited into a single exciton state, and hence, only one molecule can be sensitized to the triplet state.…”

“…The NC excitonic state is labeled as NC* rather than 3 NC* due to a strong spin−orbit coupling in NCs rendering the spin quantum number ill-defined, 30,31 but it has been definitively shown that molecular triplet sensitization using NC* is feasible, 20,24,25 a process with important applications in photon upconversion 19,22,23 and organic synthesis. 32,33 Following TET, the product state is NC− 3 M*(m − 1)M. Here we only consider the case that the NC is excited into a single exciton state, and hence, only one molecule can be sensitized to the triplet state. Importantly, in contrast to the reactant state having only one excited unit, in the product state the triplet molecule can be any of the m molecules.…”

Quantum Dot Photocatalysts for Organic Transformations

“…Later, the reaction scope was expanded to conversions of internal and terminal dienes to syn−trans vinylcyclobutanes with chemo-and stereoselectivity. 85 Beyond small organic molecule transformations, CdS QDs were successfully employed in the so-called lignin-first approach, valorizing native lignin in biomass to functionalized aromatics in the first step, with the goal of utilizing the entire lignocellulosic biomass more efficiently (Figure 6A). 78,81 In these studies, CdS QDs were demonstrated to be able to catalyze the selective cleavage of β-O-4 bonds through an electron−hole coupled oxidative dehydrogenation and sequen- tial reductive bond cleavage.…”

“…The selectivity of the kinetically disfavored syn -configuration can be explained by the prearrangement of the substrates at the QD surface (Figure D). Later, the reaction scope was expanded to conversions of internal and terminal dienes to syn – trans vinylcyclobutanes with chemo- and stereoselectivity …”

Dynamic Control of Photocatalytic Proton Reduction through the Mechanical Actuation of a Hydrogel Host Matrix

“…In the pursuit of both new molecules and new reactions to generate those molecules, laboratory synthetic chemistry has become increasingly complex, that is, increasingly reliant on the colocalization of multiple chemical species or reactions within a reaction mixture. This bio-inspired approach − requires that synthetic chemists move beyond controlling the initial reaction conditions (e.g., stoichiometry, temperature, solvent) and toward systems that sense their environments and rapidly react to environmental changes . Within biological reaction networks, vesicles compartmentalize reactions to minimize their interference and locally optimize reaction environments, but reactions also communicate with each other, and are dynamically regulated, through numerous signaling pathways.…”