A highly emissive Zn()-pyridyl-benzimidazolyl-phenolato-based chemosensor: detection of HPO "use" and "throw" device fabrication
2-Ethoxy-6-[1-(phenyl-pyridin-2-yl-methyl)-1 H -benzoimidazol-2-yl]-phenol (HL) selectively serves as a sensitive 'turn on' Zn 2+ sensor in 9 : 1 (v/v) DMSO/H 2 O (HEPES buffer, pH = 7.4) medium in the presence of sixteen other cations at the limit of detection (LOD) of 3.2 nM. The strong...
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Published in | Analytical methods Vol. 13; no. 44; pp. 5282 - 5292 |
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Main Authors | , , , |
Format | Journal Article |
Published |
18.11.2021
|
Online Access | Get full text |
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Summary: | 2-Ethoxy-6-[1-(phenyl-pyridin-2-yl-methyl)-1
H
-benzoimidazol-2-yl]-phenol (HL) selectively serves as a sensitive 'turn on' Zn
2+
sensor in 9 : 1 (v/v) DMSO/H
2
O (HEPES buffer, pH = 7.4) medium in the presence of sixteen other cations at the limit of detection (LOD) of 3.2 nM. The strong blue emission of the complex, {[Zn(L
1
)OAc]} (HL
1
= benzimidazolyl ring-opening structure of HL) (
λ
em
, 461 nm), is quenched by H
2
PO
4
−
in the presence of eighteen other anions and the LOD is 0.238 μM. The emission of the complex is due to restricted intramolecular rotation (RIR) followed by chelation-enhanced fluorescence (CHEF). The quenching of the emission of [Zn(L
1
)OAc] by H
2
PO
4
−
(in the presence of other P
V
s (inorganic and biological) as well as additional anions) is due to the 'turn off' fluorescence
via
the demetallation and release of the nonfluorescent ligand, HL, and [Zn(H
2
PO
4
)]
+
. An INHIBIT logic gate memory circuit of the probe HL was devised with Zn
2+
and H
2
PO
4
−
as two consecutive inputs. The percentage of H
2
PO
4
−
recovery was excellent and was obtained from distilled, tap, and drinking water sources. The bright blue emission of [Zn(L
1
)OAc] further triggered the fabrication of ready-made portable thin films of the Zn-complex, which executed a cost-effective 'on-site' solid-state contact mode detection of H
2
PO
4
−
with selectivity at the picogram level (10.97 pg cm
−2
) by monitoring the intensities of quenched spots under UV light upon varying the analyte concentration from 10
−8
to 10
−3
M. Finally, taking advantage of reversible fluorescence switching, a simple and definite ion-responsive security feature was successfully embedded into a "use" and "throw" solution-coated paper strip of the Zn(
ii
)-pyridyl-benzimidazolyl-phenolato-based chemosensor, which efficiently detected H
2
PO
4
−
in water by a successive 'ON-OFF' fluorescence switching-driven security activity without any exhaustion of the emission phenomenon.
A highly emissive Zn(
ii
)-pyridyl-benzimidazolyl-phenolato-based chemosensor is used in the solution-state and cost-effective 'on-site' solid-state contact mode detection of H
2
PO
4
−
. |
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Bibliography: | 10.1039/d1ay01575c Electronic supplementary information (ESI) available: The spectral characterization figures, theoretical calculation parameters and other additional required UV-Vis and fluorescence spectra. See DOI |
ISSN: | 1759-9660 1759-9679 |
DOI: | 10.1039/d1ay01575c |