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oai:ojs.www.eurjchem.com:article/728 2013-03-30T23:10:27Z eurjchem:ART driver

Synthesis and electronic properties of alkyl- and alkyloxy-curcuminoids Alsalim, Tahseen Abed Al Qader Saeed, Bahjat Ali Elias, Rita Sabah Abbo, Hanna Sabeeh Titinchi, Salam Jaber Turmeric Tautomerism Curcuminoids Electronic transitions Alkyloxy-curcuminoids High resolution mass spectra Two series of p-alkyl- and p-alkoxy-substituted curcuminoids were synthesized. The validity of the proposed structures was checked on the basis of their high resolution mass spectra as well as NMR, IR and electronic spectra. The spectra were essentially similar for both series. NMR, IR and electronic spectra showed that the compounds exist mainly or exclusively as the enolic tautomer in their solutions. Theoretical study for the electronic spectra was conducted to account for the origins of the electronic transitions that are responsible for the UV-VIS bands. The theoretical calculations were done at the B3LYP/6-31G(d) level of theory and predicted that the similarity of the electronic spectra is may be due to the close resemblance of their molecular orbitals. Atlanta Publishing House LLC 2013-03-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://www.eurjchem.com/index.php/eurjchem/article/view/728 10.5155/eurjchem.4.1.70-73.728 European Journal of Chemistry; Vol. 4 No. 1 (2013): March 2013; 70-73 2153-2257 2153-2249 eng https://www.eurjchem.com/index.php/eurjchem/article/view/728/PDF