Colorimetric and fluorescent probes
have received a lot of attention
for detecting lethal analytes in realistic systems and in living things.
Herein, a dual-approachable Benzo-hemicyaninebased red-emitting fluorescent
probe PBiSMe, for distinct and instantaneous detection of CN– and HS– was synthesized. The PBiSMe emitted red
fluorescence (570 nm) can switch to turn-off (570 nm) and blue fluorescence
(465 nm) in response to CN– and HS–, respectively. Other nucleophilic reagents, such as reactive sulfur
species (RSS) and anions, have no contact or interference with the
probe; instead, a unique approach is undertaken to exclusively interact
with CN– and HS– over a wide pH
range. The measured detection limits for CN– (0.43
μM) and HS– (0.22 μM) ions are lower
than the World Health Organization’s (WHO) recommended levels
in drinking water. We confirmed 1:1 stoichiometry ratio using Job’s
plot and observed good quantum yield for both analytes. The probe-coated
paper strips were used to detect the H2S gas produced by
food spoilage (such as eggs, raw meat, and fish) via an eye-catching
visual response. Moreover, fluorescence bioimaging studies of living
cells was done to confirm the probe’s potential by monitoring
the presence of CN– and HS– in
a living system.
The probe Pyr was synthesized in a single step through condensation of 1-pyrenecarboxyaldehyde with 4-methylpyridine. Under acidic condition (pH 2.0) probe undergoes selective reversible response with HS−than other sulfur species and the probe utilized to trace HS−in real water sample.
Fluorescent bio-imaging will be the future in the medical diagnostic for visualising inner cellular and tissues. Near-infrared (NIR) emitting fluorescent probe serve dynamically for targeted fluorescent imaging of live cells and tissues. NIR imaging is advantageous because of its merits like deep tissue penetration, minimum damage to the tissue, reduced auto fluorescence from the background, and improved resolution in imaging. The development of NIR emitting probe was well explored recently and growing drastically. In this review, we summarise recent achievements in NIR probes during the period 2018 to 2021. The merits and future applications have also been discussed in this review.
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