Enhanced fluorescence of Tb-Y-BPMPHD-CTMAB system and its analytical application

Determination of amlodipine using terbium‐sensitized luminescence in the presence of europium(III) as a co‐luminescence reagent

“…The optimum concentration of SDBS in the present study was slightly higher than the critical micelle concentration of SDBS (= 0.63 mmol/L) . The excitation spectra of Tb 3+ –SDBS in aqueous system revealed two structural bands and a shoulder, with the maximum band at 242 nm (Fig.…”

“…Among these surfactants, SDS and SDBS gave the highest intensity of the luminescence signal. The specific effect of anionic surfactants on the luminescence intensity can be associated with the ability of negatively charged micelles to concentrate Tb 3+ ions at their surfaces by electrostatic interaction, while the solubilization of ligands is mainly due to the hydrophobic interaction of the hydrocarbon skeleton of the molecule with the hydrocarbon part of the anionic surfactant . Therefore, anionic surfactants SDS and SDBS are more effective for enhancing the luminescence intensity but SDBS exhibited the highest intensity due to the interaction of SDBS with Tb 3+ , which resulted in the energy transfer from SDBS to Tb 3+ and, additionally, SDBS provides a hydrophobic environment with relatively low polarity and high viscosity.…”