Abstract
Bright green fluorescent polyaniline (FPANI) has been synthesized to develop efficient inner filter effect pair (probe-anylate). The synthesized FPANI have dual emissive peaks (blue and green) depending on excitation wavelength. But the green fluorescence intensity is prominent and significantly bright having quantum yield in the order of 0.17. Solvent directs the quality of the probe (FPANI) in terms of molecular weight, physical appearance and optical properties. An analytical method has been developed to recognize trace level of chromium and lead simultaneously and selectively using On-Off-On characteristics of the synthesized FPANI. Cr(VI) switches ‘On’ to ‘Off’ mode of the probe due to inner filter effect, while Pb(II) brings back green fluorescence (‘On’ mode) from non-fluorescent one (‘Off’ mode) through quantitative chemical interaction with chromium.
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