Detection and discrimination of Zn2+ and Hg2+ using a single molecular fluorescent probe

A new fluorescent probe (SAPH) has been introduced which shows specific sensing towards Zn2+ and Hg2+ at two different wavelength maxima at physiological pH. The probe shows a brilliant ratiometric red shift in emission spectra upon addition of Zn2+ at 678 nm while upon addition of Hg2+ it shows a t...

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Bibliographic Details
Published inNew journal of chemistry Vol. 42; no. 11; pp. 8646 - 8652
Main Authors Gharami, Saswati, Aich, Krishnendu, Patra, Lakshman, Mondal, Tapan K.
Format Journal Article
LanguageEnglish
Published CAMBRIDGE Royal Soc Chemistry 07.06.2018
Royal Society of Chemistry
Subjects
Chemistry
Chemistry, Multidisciplinary
Doppler effect
Emission spectra
Fluorescent indicators
Mercury (metal)
Molecular chains
Physical Sciences
Red shift
Science & Technology
HIGHLY SELECTIVE DETECTION
NAKED-EYE
MERCURY
EXCITATION-ENERGIES
SENSOR
DENSITY-FUNCTIONAL THEORY
ZINC
TURN-ON CHEMOSENSOR
AQUEOUS-SOLUTION
LIVING CELLS
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Summary:A new fluorescent probe (SAPH) has been introduced which shows specific sensing towards Zn2+ and Hg2+ at two different wavelength maxima at physiological pH. The probe shows a brilliant ratiometric red shift in emission spectra upon addition of Zn2+ at 678 nm while upon addition of Hg2+ it shows a turn-on ratiometric emission enhancement with a red shift at 647 nm. Job's plot confirms the 1:1 complexation for both Zn2+ and Hg2+. The binding constants have been calculated using the Benesi-Hildebrand equation and found to be 3.03 x 10(5) M-1 and 6.05 x 10(4) M-1 respectively for SAPH-Zn2+ and SAPH-Hg2+. DFT and TDDFT studies are conducted using the probe to establish a similarity between theoretical and experimental outcomes.
ISSN:1144-0546
1369-9261
DOI:10.1039/c8nj01212a