Spectrophotometric Investigation of the Interaction of Polyoxometalates with Cationic Dyes

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发表日期：

2024年7月25日

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Malak Kahloul,
Ridha Lafi,
Ibtissem Ounifi,
Badra El Abed,
Imed Montasser,
Amor Hafiane

摘要

The interaction of a cationic dyes methylene blue (MB) and toluidine blue (TB) in aqueous solution with anionic lacunary polyoxometalate K₇PW₁₁O₃₉.14H₂O (LPOM_s) has been investigated spectrophotometrically. The results showed that when the amounts of LPOM_s was increased, the formation of H‒aggregates of dye‒LPOM_s complex were obtained. The stoichiometry of MB–LPOM_s and TB–LPOM_s complex was evaluated using the ratio method and was found to be 1:1. The stability constant of the two complex at 298 K was calculated, and the amount of additives inducing total destabilization of these complexes were determined. Finally, it is quit probably that the interaction mechanism is related to electrostatic interactions between the dyes and the LPOMs.