• A Adenier

      Articles written in Journal of Chemical Sciences

    • Effects of various salts on the spectral properties of merocyanine 540, a fluorescent probe, in aqueous media

      A Adenier F Duville J J Aaron

      More Details Abstract Fulltext PDF

      The effects of several biologically-important inorganic salts (NaCl, KCl, MgCl2, MgSO4, CaCl2, EuCl3 and Er(CH3COO)3) on the electronic absorption and fluorescence spectra of merocyanine 540 (MC-540) have been determined in aqueous media. Depending on both the MC-540 concentration and the nature of salt, a new absorption band is obtained, above a threshold of salt concentration. The cations produce two types of fluorescence quenching according to their charge: in the case of monovalent ions (Na+, K+), a nonlinear Stern-Volmer behaviour is observed, while for divalent alkaline-earth (Mg2+, Ca2+) and trivalent lanthanide (Eu3+, Er3+) ions, linear Stern-Volmer relationships are established. Our results, which exclude the presence of protonated MC-540, demonstrate the existence of interactions between the inorganic ions and the MC-540 highly polar zwitterionic structure followed by an ion-induced aggregation of the dye.

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