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(E)-(4-Methoxyphenyl)-N-(4H-1,2,4-triazol-4-yl) methanimine: Solvent driven single molecule triple fluorescent “on” sensor for Cu2+, Cd2+ and Hg2+

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Title (E)-(4-Methoxyphenyl)-N-(4H-1,2,4-triazol-4-yl) methanimine: Solvent driven single molecule triple fluorescent “on” sensor for Cu2+, Cd2+ and Hg2+
 
Creator Deka, Satyapriya
Guha, Ankur Kanti
Das, Diganta Kumar
 
Subject Cadmium
Copper
Fluorescence
Mercury
Schiff base
Sensor
 
Description 213-217
A single molecule, (E)-(4-methoxyphenyl)-N-(4H-1,2,4-triazol-4-yl) methanimine (Metho-tria-imine), can detect Cu2+,
Cd2+ or Hg2+ depending on whether the solvent is H2O, CH3CN or C2H5OH respectively by fluorescence “on” mode. The
enhancement in fluorescence intensity is found to be ca. 13 times for Cu2+, 70 times for Cd2+ and 57 times for Hg2+. The
metal ions - Al3+, Co2+, K+, Li+, Mg2+, Mn2+, Na+, Ni2+, Pb2+, Zn2+ (along with two metal ions out of Cu2+, Cd2+ and Hg2+ for
which the sensor is not effective) do not interfere. The plot of absorbance versus metal ion concentration was sigmoidal for
Cu2+ and Cd2+ and linear for Hg2+ which indicates formation of dimeric complexes in solution for Cu2+ and Cd2+. DFT
studies showed metal-metal bonding in case of Metho-tria-imine forming complexes with Cu2+ and Cd2+ and hence dimeric
complexes with highest binding energy for Cu2+ in H2O, Cd2+ in CH3CN, Hg2+ in C2H5OH. The detection limits are found to
be 1.9×10-8 M, 7.0×10-7 M and 6.9×10-8 M respectively and Metho-tria-imine is reversible with respect to EDTA2- for all the
three metal ions
 
Date 2022-05-17T10:09:58Z
2022-05-17T10:09:58Z
2022-03
 
Type Article
 
Identifier 0975-0991 (Online); 0971-457X (Print)
http://nopr.niscair.res.in/handle/123456789/59723
 
Language en
 
Publisher CSIR-NIScPR, India
 
Source IJCT Vol.29(2) [March 2022]