Abstract

The results of quenching of fluorescence of the dye Safranine T (ST) by the inorganic ions [Fe(CN)6]3−, [Fe(CN)6]4−, Cu2+, Co2+, Ni2+ and Mn2+ in aqueous micellar solutions of the surfactants diethylene glycol hexadecyl ether (Brij 52), decaethylene glycol hexadecyl ether (Brij 56) and cicosaethylene glycol hexadecyl ether (Brij 58) are presented. The quenching results have been processed in the light of Stern-Volmer (SV) equation and its modified forms to evaluate the extents of interaction between the fluorophore (ST) and the quencher. The magnitudes of the Stern-Volmer constant (KSV) in quencher micelles follow the trend [Fe(CN)6]3− > [Fe(CN)6]4− > Co2+ > Cu2> Ni2+> Mn2+ in all the Brij media; for each ion the trend in terms of the surfactants is Brij 52> Brij 56> Brij 58, which is the order of the polarity of the Brij environment. The ion Co2+ appears to partly quench the emission process by the static mode. The solvent parameters of the Brij micellar media like the Kosower Z value, the transition energy for the intramolecular charge transfer, ET30 and the dielectric constant, D, have been estimated from the shift between the absorption and emission frequencies. A comparison of the quenching behaviours of inorganic ions on ST fluorescence in different media viz., aqueous, aqueous polyethylene glycol and aqueous micellar solutions of Tweens and Brijs has been presented.

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