The Fourier transform Raman and infrared spectra of nicotinaldehyde were recorded and the observed frequencies were assigned to various modes of vibration in terms of fundamentals by assuming Cs point group symmetry. A normal coordinate analysis was also carried out using a simple valence force field. A complete vibrational analysis is presented here for this molecule and the results are briefly discussed.
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http://dx.doi.org/10.1016/j.saa.2005.06.040 | DOI Listing |
Braz Dent J
December 2024
Graduate Program in Dentistry, Federal University of Ceará, Fortaleza, Ceará, Brazil.
The aim of this study was to verify the biomodifying action of 6.5% grape seed extract solutions, with different pH, when applied on dentin collagen. Dentin bars (1.
View Article and Find Full Text PDFDalton Trans
December 2024
CICECO - Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
Int J Mol Sci
November 2024
School of Health & Medical Sciences, University of Economics and Human Sciences in Warsaw, Okopowa 59, 01-043 Warsaw, Poland.
We discussed and summarized the latest data from the global literature on the action of polyphenolic antioxidants and their metal complexes. The review also includes a summary of the outcomes of theoretical computations and our many years of experimental experience. We employed various methods, including spectroscopy (FT-IR, FT-Raman, NMR, UV/Vis), X-ray diffraction, thermal analysis, quantum calculations, and biological assays (DPPH, ABTS, FRAP, cytotoxicity, and genotoxicity tests).
View Article and Find Full Text PDFChem Sci
July 2024
Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, Key Laboratory of Polymeric Materials and Application Technology of Hunan Province, College of Chemistry, Xiangtan University Xiangtan 411105 P. R. China
Two soluble conjugated ladder polymers (cLPs), decorated with multiple electron-poor species (, cyano groups, fused pentagons, and N-heterocyclic rings), have been synthesized from the newly developed tetraketo-functionalized double aza[5]helicene building blocks using a single-step Knoevenagel polycondensation strategy. This facile approach features mild conditions (, room temperature) and high efficiency, allowing us to quickly access a nonalternant ladder-like conjugated system with the formation of multicyano substituents in the backbone. Analysis by H NMR, FT-Raman, and FT-IR spectra confirms the successful synthesis of the resulting cLPs.
View Article and Find Full Text PDFSpectrochim Acta A Mol Biomol Spectrosc
December 2024
Department of Physics and Astronomy, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.
The objective of this investigation is to learn more about the structural, electrical, spectroscopic, and physiochemical characteristics of biologically active cyano-4'-hydroxybiphenyl (CHBP). The title molecule's optimized conformational analysis was computed using the DFT/B3LYP/6-311++G (d, p) level of theory. The observed wavenumbers were compared with theoretical FT-IR and FT-Raman spectra.
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