This paper presents accurate predictions of ecologically important properties of nitroaromatic compounds and their derivatives, including vapor pressure, Henry's law constants, water solubility, octanol/water partition coefficients, heats of formation and ionization potentials. The proposed technique of calculations was based on quantum-chemical methods. The relationship between the chemical structure and mentioned physico-chemical parameters of such widespread military produced contaminants as trinitrotoluene and its derivatives was considered. We revealed that the DFT level of theory combined with the COSMO-RS technique is able to predict the studied parameters with an accuracy that results in error bars of less then one logarithmic unit.
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http://dx.doi.org/10.1016/j.chemosphere.2007.03.067 | DOI Listing |
Int J Mol Sci
January 2025
Faculty of Chemistry and Pharmacy, University of Opole, Oleska 48, 45-052 Opole, Poland.
O-Methyldehydroserine, ΔSer(Me), is a non-standard α,β-dehydroamino acid, which occurs naturally in Cyrmenins with potential pharmaceutical application. The C-terminal part and the side chain of the ΔSer(Me) residue constitute the β-methoxyacrylate unit, responsible for antifungal activity of Cyrmenins. The short model, Ac-ΔSer(Me)-OMe, was analyzed considering the geometrical isomer Z () and E ().
View Article and Find Full Text PDFJ Chem Inf Model
January 2025
School of Food Science and Technology, Jiangnan University, Wuxi214122, China.
Antioxidant peptides (AOPs) hold great promise for mitigating oxidative-stress-related diseases, but their discovery is hindered by inefficient and time-consuming traditional methods. To address this, we developed an innovative framework combining machine learning and quantum chemistry to accelerate AOP identification and analyze structure-activity relationships. A Bi-LSTM-based model, AOPP, achieved superior performance with accuracies of 0.
View Article and Find Full Text PDFMolecules
December 2024
Department of Chemistry & Biochemistry, University of Mississippi, University, MS 38677, USA.
Molecular dyes containing carbazole-based π bridges and/or julolidine-based donors should be promising molecules for intense SWIR emission with potential application to molecular bioimaging. This study stochastically analyzes the combinations of more than 250 organic dyes constructed within the D-π-D (or equivalently D-B-D) motif. These dyes are built from 22 donors (D) and 14 π bridges (B) and are computationally examined using density functional theory (DFT).
View Article and Find Full Text PDFMaterials (Basel)
December 2024
Faculty of Chemistry, Jagiellonian University in Kraków, Gronostajowa 2 Str., 30-387 Kraków, Poland.
The large numbers of ion exchange resins used in various industries (food, pharmaceutitics, mining, hydrometallurgy), and especially in water treatment, are based on cross-linked polystyrene and divinylbenzene copolymers with functional groups capable of ion exchange. Their advantage, which makes them environmentally friendly, is the possibility of their regeneration and reuse. Taking into account the wide application of these materials, styrene-divinylbenzene resin with a quaternary ammonium functional group, AmberliteIRA402, was characterized using a well-known and widely used method, FT-IR spectroscopy.
View Article and Find Full Text PDFAcc Chem Res
January 2025
Department of Chemistry, Seoul National University, Seoul 151-747, South Korea.
ConspectusWhile traditional quantum chemical theories have long been central to research, they encounter limitations when applied to complex situations. Two of the most widely used quantum chemical approaches, Density Functional Theory (DFT) and Time-Dependent Density Functional Theory (TDDFT), perform well in cases with relatively weak electron correlation, such as the ground-state minima of closed-shell systems (Franck-Condon region). However, their applicability diminishes in more demanding scenarios.
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