UV-VIS SPECTROSCOPIC STUDY OF NATURAL DYES WITH ALUM AS A MORDANT
Keywords:
Morin, quercetin, spectroscopic, complexation, alumAbstract
The formation of complexes between alum with morin and quercetin in aqueous solution with and without pH control have been studied by UV-visible spectroscopy. The stoichiometries of the complexes were evaluated using the molar ratio method. The association ratio of alum with morin and quercetin without pH control were 3 : 2 and 1 : 1, respectively. In the buffer system pH 4.5, the stoichiometry of alum with morin and quercetin were 1 : 1 and 1 : 1, respectively. The heats of formation of complex, obtained by semi-empirical PM3 method, indicated that the proposed complexes can be favorably formed.
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