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Local field effects of quadrupole contributions on sum frequency generation spectroscopy.
J Chem Phys
December 2024
Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan.
In the theory of condensed-phase spectroscopy, local field effect is of general importance to account for intermolecular electrostatic interactions. The present paper extends the microscopic treatment of local field effects on the sum frequency generation (SFG) spectroscopy to incorporate quadrupole interactions, since their roles have been increasingly recognized in the SFG spectroscopy. The extended theory involves some corrections to the conventional formulas of the nonlinear susceptibilities in both the interface and bulk regions, including the χIQB term.
View Article and Find Full Text PDFLight-Induced Hysteresis of Electronic Polarization in Anti-Ferromagnet FePS.
Adv Mater
January 2025
Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS), Suwon, 16419, Republic of Korea.
Research on manipulating materials using light has garnered significant interest, yet examples of controlling electronic polarization in magnetic materials remain scarce. Here, the hysteresis of electronic polarization in the anti-ferromagnetic semiconductor FePS is demonstrated via light. Below the Néel temperature, linear dichroism (i.
View Article and Find Full Text PDFStudy of Cytotoxicity of Spiro-Fused [3-Azabicyclo[3.1.0]hexane]oxindoles and Cyclopropa[a]pyrrolizidine-oxindoles Against Tumor Cell Lines.
Pharmaceuticals (Basel)
November 2024
Laboratory of Nanobiotechnologies, Saint-Petersburg National Research Academic University of the Russian Academy of Sciences, Saint Petersburg 194021, Russia.
: A series of spiro-fused heterocyclic compounds containing cyclopropa[a]pyrrolizidine-2,3'-oxindole and 3-spiro[3-azabicyclo[3.1.0]-hexane]oxindole frameworks were synthesized and studied for their in vitro antiproliferative activity against human erythroleukemia (K562), cervical carcinoma (HeLa), acute T cell leukemia (Jurkat), melanoma (Sk-mel-2) and breast cancer (MCF-7) as well as mouse colon carcinoma (CT26) cell lines.
View Article and Find Full Text PDFIsolated Dipolar ONN Schiff Base Regioisomers: Synthesis, Characterization and Crystallographic Study.
Molecules
December 2024
Laboratorio de Química Inorgánica y Organometálica, Departamento de Química Analítica e Inorgánica, Facultad de Ciencias Químicas, Universidad de Concepción, Edmundo Larenas 129, Casilla 160-C, Concepción 4070386, Chile.
Organic compounds with 1,3-diketone or 3-amino enone functional groups are extremely important as they can be converted into a plethora of carbo- or heterocyclic derivatives or can be used as ligands in the formation of metal complexes. Here, we have achieved the preparation of a series of non-symmetrical β-ketoenamines (O,N,N proligand) of the type (4-MeOCH)C(=O)CH=C(R)NH(Q) obtained through the Schiff base condensation of 1,3-diketones (1-anisoylacetone, 1-anisyl-3-(4-cyanophenyl)-1,3-propanedione, and 1-anisyl-3-(4,4,4-trifluorotolyl)-1,3-propanedione) functionalized with electron donor and electron-withdrawing substituents and 8-aminoquinoline (R = CH, 4-CHCN, 4-CHCF; Q = CHN). Schiff base ketoimines with a pendant quinolyl moiety were isolated as single regioisomers in yields of 22-56% and characterized with FT-IR, H NMR, and UV-visible spectroscopy, as well as single-crystal X-ray crystallography, which allowed for the elucidation of the nature of the isolated regioisomers.
View Article and Find Full Text PDFTwo-electron two-nucleus effective Hamiltonian and the spin diffusion barrier.
Sci Adv
January 2025
Institute of Molecular Physical Science, ETH Zurich, 8093 Zurich, Switzerland.
Article Synopsis
- Dynamic nuclear polarization (DNP) and quantum technologies utilize the spin transfer in electron-nuclear quantum systems, but larger couplings like hyperfine interactions can hinder these processes.
- The Schrieffer-Wolff transformation is applied to analyze a system of two electrons and two nuclei, focusing on polarization-transfer methods, including an energy-conserving electron-nuclear four-spin flip-flop.
- The study connects magnetic resonance and quantum information, demonstrating a model where all nuclear spins can aid in hyperpolarization without being impeded by a spin diffusion barrier in DNP.
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