The solvation structure of yttrium (III) in dimethyl sulfoxide has been determined by studying both the extended X-ray absorption fine structure (EXAFS) and the X-ray absorption near edge structure (XANES) regions of the Y K-edge absorption spectra. Although the EXAFS technique provides accurate information about the next neighbors coordination distances, no unambiguous determination of the coordination polyhedron is obtained. This failure is counteracted by the study of the near-edge part of the absorption spectrum (XANES) because of its high sensitivity to the bonding geometry. We have performed an extensive and systematic ab initio computation of the Y K-edge XANES spectrum of yttrium (III) in dimethyl sulfoxide within the multiple-scattering framework. The comparison between the experimental data and the theoretical calculations has demonstrated that the solvation sphere of the yttrium cation is best modeled by eight dimethyl sulfoxide molecules each oriented to give an Y-O-S angle close to 130 degrees .
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http://dx.doi.org/10.1021/jp809575g | DOI Listing |
Cell Mol Biol (Noisy-le-grand)
January 2025
Veterinary Medicine College, University Of Kerbala, Kerbala, Iraq.
Vitamin E is a well-known antioxidant and is frequently used as an adjunct treatment in cancer therapy. Busulfan is a commonly used drug for cancer treatment. In this study, twenty-eight male rats, ten weeks old and weighing between 250 and 300 grams, were divided into four groups.
View Article and Find Full Text PDFJ Fluoresc
January 2025
School of Materials and Chemical Engineering, West Anhui University, Lu'an, Anhui, 237012, China.
Nitrogen@Carbon quantum dots (N@CQDs) are prepared using microwave hydrothermal method, and polyvinylpyrrolidone (PVP) and melamine are used as mixed C source and N source. Microwave reaction conditions of preparing the N@CQDs are 170 ℃ and 3 h. This N@CQDs are are used as fluorescence probe for detection of amino acids.
View Article and Find Full Text PDFMolecules
January 2025
School of Environmental and Materials Engineering, Yantai University, Yantai 264005, China.
This study systematically investigated the effect of organic solvent addition on the detection signal intensity of 15 organic pesticides in water using ultra-high-performance liquid chromatography-electrospray ionization-tandem mass spectrometry (UHPLC-ESI-MS/MS). The analysis of chromatographic peak area ratios in ultrapure water (UPW) versus 30% methanol (MeOH)-UPW showed that the adsorption effects (AEs, mainly from injection vials with weaker polarity) were the main factor influencing the detection intensity of the organic pesticides. The AEs varied with pesticide type and concentration, especially for those with high logK values and longer retention times, such as malathion, triadimefon, prometryn, S-metolachlor, diazinon, and profenofos.
View Article and Find Full Text PDFJ Org Chem
January 2025
State Key Laboratory of Macromolecular Drugs and Large-Scale Manufacturing, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou 325035, P. R. China.
The Pd-catalyzed multicomponent tandem reaction of β-ketonitriles, arylboronic acids and DMSO was efficiently developed, enabling access to a variety of poly substituted pyridines. The protocol shows excellent chemoselectivity, generating nicotinonitriles or symmetrical tetrasubstituted pyridines under different conditions by tandem cyclization of enaminone intermediates with β-ketonitriles or enolates, respectively, and does not require extra ammonias. This method boasts notable advantages, such as the use of commercially available or easily prepared substrates, simple conditions, a broad substrate scope, and good functional group tolerance.
View Article and Find Full Text PDFAMB Express
January 2025
Plant Protection Department, Faculty of Agriculture, Beni-Suef University, Beni-Suef, 62511, Egypt.
Nonylphenol (NP) is a ubiquitous environmental endocrine disrupting chemical and oxidative stress inducer in biological systems. Resveratrol (RES) and Naringenin (NG) are phytochemicals possessing antioxidant properties and estrogenic activity. This study was conducted to investigate the toxicity of NP and the mitigating effects of RES and NG on NP toxicity in rats.
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