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Solvatochromism and cis-trans isomerism in azobenzene-4-sulfonyl chloride.
Photochem Photobiol Sci
January 2025
CQC-IMS, Department of Chemistry, University of Coimbra, 3004-535, Coimbra, Portugal.
Solvatochromism exhibited by azobenzene-4-sulfonyl chloride (here abbreviated as Azo-SCl) has been investigated in a series of non-polar, polar-aprotic and polar-protic solvents. The UV-vis spectra of Azo-SCl exhibit two long-wavelength bands, observed at 321-330 nm (band-I) and 435-461 nm (band-II), which are ascribed to the π*-π (S ← S) and π*-n (S ← S) transitions, respectively. The shorter wavelength band indicates a reversal in solvatochromism, from negative to positive solvatochromism, for a solvent with a dielectric constant of 32.
View Article and Find Full Text PDFPhotoluminescence emission and Raman enhancement in TERS: an experimental and analytic revisiting.
Nanophotonics
March 2024
Institute of Physical and Theoretical Chemistry, Eberhard Karls University of Tübingen, 72076 Tübingen, Germany.
Article Synopsis
- The study presents an analytic model that improves the understanding of Raman and fluorescence enhancement in molecules situated between two closely spaced gold nanospheres, taking into account higher-order modes along with the traditional dipolar mode.
- The model is validated by gap-dependent tip-enhanced Raman spectroscopy (TERS) experiments, which reveal varying trends of photoluminescence and Raman enhancement as the gap width decreases.
- A red-shift in the background spectra indicates greater coupling between the nanospheres, demonstrating how the model effectively explains the mechanisms at play in the TERS experimental observations.
Effect of Exchange Dynamics on the NMR Relaxation of Water in Porous Silica.
J Phys Chem Lett
November 2024
Dept. Technische Physik II/Polymerphysik, Technische Universität Ilmenau, D-98684 Ilmenau, Germany.
The interaction of molecules, in particular, water, with solid interfaces has been studied by a multitude of methods, among them nuclear magnetic resonance spin relaxation. The frequency dependence of the relaxation times follows patterns that have been interpreted in terms of the molecular orientation and dynamics. Several different model approaches could successfully explain limiting cases of H relaxation dispersion in systems with rigid surfaces such as silica gel or glass, but none of them can reproduce the relaxation of both H and H nuclei, which differ in their respective relaxation mechanisms, dipolar vs quadrupolar.
View Article and Find Full Text PDFExploring the Influence of Ionic Liquid Anion Structure on Gas-Ionic Liquid Partition Coefficients of Organic Solutes Using Machine Learning.
Langmuir
November 2024
Department of Chemistry, University of Tartu, 14a Ravila Street, Tartu 50411, Estonia.
This article presents an in-depth investigation into the influence of anionic structures of ionic liquids (ILs) on gas-ionic liquid partition coefficients (log ) of organic solutes in three ILs. While the primary objective was to examine whether there is a relationship between the molecular structure of the IL anion component and log , additionally it was looked at whether the molecular descriptors of the anion in the relationships encode possible molecular interactions during the miscibility and partitioning in the IL. The research involves the compilation of data series of experimental log values, where the cation component is constant.
View Article and Find Full Text PDFLongitudinal and Transverse H Nuclear Magnetic Resonance Relaxivities of Lanthanide Ions in Aqueous Solution up to 1.4 GHz/33 T.
Molecules
October 2024
Université Grenoble Alpes, LNCMI-EMFL, CNRS, INSA-T, and UPS, CEDEX 9, 38042 Grenoble, France.
The longitudinal and transverse nuclear magnetic resonance relaxivity dispersion (NMRD) of H in water induced by the paramagnetic relaxation enhancement (PRE) of dissolved lanthanide ions (Ln) can become very strong. Longitudinal and transverse H NMRD for Gd, Dy, Er and Ho were measured from 20 MHz/0.47 T to 1382 MHz/32.
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