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- W1988675120 abstract "The ultraviolet absorption spectra of the carboxyl group of three isomeric pyridine carboxylic acids N-oxides (picolinic acid N-oxide, nicotinic acid N-oxide and isonicotinic acid N-oxide) were determined in fourteen solvents in the wavelength range from 200 to 400 nm. The position of the absorption maxima (?max) of the examined acids showed that the ultraviolet absorption maximum wavelengths of picolinic acid N-oxide are the shortest, and those of isonicotinic acid N-oxide acid are the longest. In order to analyze the solvent effect on the obtained absorption spectra, the ultraviolet absorption frequencies of the electronic transitions in the carboxylic group of the examined acids were correlated using a total solvatochromic equation of the form max = v0 + s? + a?+ b?, where ?max is the absorption frequency (1/?max), p is a measure of the solvent polarity, ? represents the scale of solvent hydrogen bond acceptor basicities and ? represent the scale of solvent hydrogen bond donor acidities. The correlation of the spectroscopic data was carried out by means of multiple linear regression analysis. The solvent effects on the ultraviolet absorption maximums of the examined acids were discussed." @default.
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- W1988675120 date "2013-01-01" @default.
- W1988675120 modified "2023-09-25" @default.
- W1988675120 title "The effects of solvents and structure on the electronic absorption spectra of the isomeric pyridine carboxylic acid N-oxides" @default.
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- W1988675120 doi "https://doi.org/10.2298/ciceq120326073d" @default.
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