Schiff Base Derived from 4,4'-methylenedianiline and P-anisaldehyde: Colorimetric Sensor for Cu, Paper Strip Sensor for Al and Fluorescent Sensor for Pb

Overview

Journal J Fluoresc

Specialties Biophysics
Chemistry

Date 2019 Dec 2

PMID 31786706

Authors

Diganta Kumar Das

Satyapriya Deka

Ankur Kanti Guha

Affiliations

Soon will be listed here.

Abstract

The condensation product (L) of 4,4'-methylenedianiline and p-anisaldehyde acts as colorimetric sensor for Cu and Pb ions. On interaction with Cu, ethanolic solution of L changes its color to brown while it becomes light pink on interaction with Pb. Interaction of Al with L coated paper strip emits bright blue fluorescence. Metal ions like Mg, Cu, Li, K, Na, Mn, Al, Hg, Co, Pb, Ni, Cd, Zn, Fe do not interfere the paper strip sensor. The fluorescent intensity of L in ethanol is quenched 25 times by Pb ion. The interaction between L and Pb is reversible and the detection limit of Pb is 10 M. The binding constant and stoichiometry of binding between L and Pb was calculated to be 10 and 1:2. Theoretical calculations show that the binding of the metal ions to L are favorable and the fluorescence of L is due to π → π* transition.

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