Improving Copper(II) Sensitivity by Combined Use of AIEE Active and Inactive Schiff Bases

Overview

Journal J Fluoresc

Specialties Biophysics
Chemistry

Date 2023 Jul 15

PMID 37452963

Authors

Kanishk Bhardwaj

Thangaraj Anand

Ritambhara Jangir

Suban K Sahoo

Affiliations

Soon will be listed here.

Abstract

An aggregation-induced emission enhancement (AIEE) active Schiff base PNN was synthesized by condensing benzidine with 2-hydroxynaphthaldehyde. The green-fluorescent PNN (λ = 510 nm) in DMF turned to yellow-fluorescent PNN (λ = 557 nm) upon increasing the fractions of HEPES buffer (10 mM, pH 7.4) above 40%. The DLS study supports the self-aggregation of PNN that restricts the intramolecular rotation and activates the excited-state intramolecular proton transfer (ESIPT) process. The fluorescence emission of AIEE active PNN was quenched by Cu with an estimated detection limit of 2.1 µM. Interestingly, the detection limit of PNN towards Cu was improved in the presence of an AIEE inactive Schiff base PBPM obtained by reacting 1,4-diaminobenzene with pyridine-4-carbaldehyde. The mixed PNN-PBPM showed a detection limit of 0.49 µM. The practical utility of PNN-PBPM was validated by quantifying Cu ions in real environmental water samples and green tea.

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