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A new “on-off-on” fluorescent probe for sequential detection of Fe3+ and PPi based on 2-pyridin-2-ylethanamine and benzimidazo [2,1-a]benz[de]isoquinoline-7-one-12-carboxylic acid

Abstract

A new fluorescent probe X based on 2-pyridin-2-ylethanamine and benzimidazo[2,1-a]benz[de]isoquinoline-7-one-12-carboxylic acid was designed and synthesized for the detection of Fe3+ and PPi. X showed high sensitivity and selectivity for Fe3+ in the presence of other competing metal ions in DMF/H2O buffer solution. The limit of detection for Fe3+ was calculated from the titration curve to be 6.7 × 10-7 M. The Job’s plot confirmed 1:1 stoichiometry between the probe and Fe3+, and the complexation stability constant was calculated to be 7.46 × 103 M−1. Moreover, the fluorescence intensity of probe was recovered after addition of the PPi. The X could act as a fluorescence “on-off-on” probe for sequential detection of Fe3+ and PPi. The binding mode and sensing mechanism of X with Fe3+ was verified by DFT/TDDFT calculation using Gaussian 09.

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Publication details

The article was received on 25 Sep 2018, accepted on 24 Oct 2018 and first published on 07 Nov 2018


Article type: Paper
DOI: 10.1039/C8NJ04870C
Citation: New J. Chem., 2018, Accepted Manuscript
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    A new “on-off-on” fluorescent probe for sequential detection of Fe3+ and PPi based on 2-pyridin-2-ylethanamine and benzimidazo [2,1-a]benz[de]isoquinoline-7-one-12-carboxylic acid

    Y. Xu, X. Liu, J. Zhao, H. Wang, Z. Liu, X. Yang, M. Pei and G. zhang, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ04870C

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