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Coherent manipulation of photochemical spin-triplet formation in quantum dot-molecule hybrids.
Nat Mater
January 2025
State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China.
The interconversion between singlet and triplet spin states of photogenerated radical pairs is a genuine quantum process, which can be harnessed to coherently manipulate the recombination products through a magnetic field. This control is central to such diverse fields as molecular optoelectronics, quantum sensing, quantum biology and spin chemistry, but its effect is typically fairly weak in pure molecular systems. Here we introduce hybrid radical pairs constructed from semiconductor quantum dots and organic molecules.
View Article and Find Full Text PDFCatalytic and Asymptotic Equivalence for Quantum Entanglement.
Phys Rev Lett
December 2024
Institute of Fundamental Technological Research, Polish Academy of Sciences, Pawińskiego 5B, 02-106 Warsaw, Poland.
Article Synopsis
- Entanglement is essential for quantum information processing, but manipulating it effectively remains difficult due to noise and the challenge of obtaining highly entangled pure states.
- Many techniques exist for distilling these states from noisy versions, often requiring multiple copies, which applies to tasks like quantum teleportation and cryptography.
- The study shows that using an entangled state as a catalyst for single-copy manipulations offers a powerful alternative, revealing connections between asymptotic and catalytic methods, and emphasizing the role of correlations without improving the distillation rate.
In Search of Entangled Singlet Pure Diradicals.
J Phys Chem A
January 2025
Laboratoire de Chimie et Physique Quantiques, IRSAMC-CNRS-UMR 5626, Université Paul-Sabatier (Toulouse III), 31062 Toulouse, Cedex 4, France.
Recent work has documented conjugate polycyclic hydrocarbons presenting unusual properties: accepting full on-bond electron pairing, they could be considered as closed-shell architectures, but their ground-state wave function is actually a pure diradical singlet, free of any ionic component, in contrast to diradicaloids. These so-called molecules also differ from disjoint diradicals, which do not accept on-bond electron pairing, in that their singly occupied molecular orbitals (SOMOs) are spatially entangled rather than disjoint. The present work first extends the study to a broad series of architectures exhibiting the same properties, namely: they present two degenerate SOMOs in the topological Hückel Hamiltonian, and their pure diradical wave functions lead to symmetry-keeping geometries.
View Article and Find Full Text PDFNitrogen-phosphorus codoped biochar prepared from tannic acid for degradation of trace antibiotics in wastewater.
Environ Res
February 2025
Shaanxi Key Laboratory of Catalysis, School of Chemistry and Environment Science, Shaanxi University of Technology, Hanzhong, 723001, PR China. Electronic address:
This study was designed to develop a one-step pyrolysis process that could efficiently activate peroxymonosulfate (PMS) and degrade tetracycline hydrochloride (TCH) by producing N, and P codoped carbon materials (NPTC-800). Furthermore, it exhibited a high specific surface area (658 cm), a larger pore volume (0.3 cm), and a certain content of heteroatoms (nitrogen and phosphorus).
View Article and Find Full Text PDFCucurbit[8]uril-stabilized charge transfer: An efficient supramolecular approach toward a heterogeneous organic photocatalyst for aerobic oxidation reactions.
Chemistry
December 2024
Hunan Normal University, Department of Chemistry, Hunan Normal University, 410081, Changsha, CHINA.
Host-stabilized charge transfer (HSCT) has been widely utilized in macrocycle-derived supramolecular assemblies and architectures. However, there has been less research attention focused on the direct fabrication of pure organic photocatalysts using HSCT. Herein, four viologen derivatives (m-PV2+, m-BPV2+, d-PV2+, and d-BPV2+) with different electron donor-acceptor (D-A) structures were synthesized.
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