title: Solvent effects on the electronic absorption spectra and acid strength of some substituted pyridinols.
abstract: The electronic absorption spectra of some substituted pyridinols in organic solvents of different polarities are studied. Also, the solvent effects on the intramolecular charge transfer bands are discussed using various solvent parameters. The acid-base equilibria of the compounds used are studied spectrophotometrically in various mixed aqueous solvents at 25 degrees C and 0.1 M ionic strength (NaClO4). Furthermore, the influence of the solvents on the dissociation constants and tautomeric equilibria of a pyridinol derivatives are discussed. The effect of molecular structure of the pyridinols on the pK's is also examined.
authors.affiliation: Chemistry Department, Faculty of Science, Assiut University, Egypt.
authors.forename: Elham Y
authors.initials: EY
authors.lastname: Hashem
authors.forename: Magda S
authors.initials: MS
authors.lastname: Saleh
mesh_terms: D000143:Acids / Q000737:chemistry; D004146:Dioxanes / Q000737:chemistry*; D000431:Ethanol / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D011725:Pyridines / Q000737:chemistry*; D012997:Solvents; D013057:Spectrum Analysis
chemical_list: D000143:Acids; D004146:Dioxanes; D011725:Pyridines; D012997:Solvents; D000431:Ethanol; C035877:2,3-dihydroxypyridine; C025223:1,4-dioxane