Recent advances in turn off-on fluorescence sensing strategies for sensitive biochemical analysis - A mechanistic approach

Smartphone-Assisted EY@MOF-5-Based Dual-Emission Fluorescent Sensor for Rapid On-Site Detection of Daclatasvir and Nitenpyram

“…The fluorescence sensing mechanism of the EY@MOF-5-based sensor for DCT and NTP detection is investigated. Different fluorescent mechanisms, such as fluorescence resonance energy transfer (FRET), cross-link-enhanced emission (CEE), and aggregation-induced emission enhancement (AIEE) for turn-on and PET, 1FE, and DET for turn-off, have been reported in the literature . Noncovalent interactions, such as hydrogen-bonding, π–π interactions, cation−π, anion−π, van der Waals, and electrostatic interactions are accountable for the fluorescence detection of analytes through fluorescent MOFs …”

“…Different fluorescent mechanisms, such as fluorescence resonance energy transfer (FRET), cross-link-enhanced emission (CEE), and aggregation-induced emission enhancement (AIEE) for turn-on and PET, 1FE, and DET for turn-off, have been reported in the literature. 50 Noncovalent interactions, such as hydrogenbonding, π−π interactions, cation−π, anion−π, van der Waals, and electrostatic interactions are accountable for the fluorescence detection of analytes through fluorescent MOFs. 51 Figure 9A depicts that the UV−vis spectra of NTP do not overlap with the excitation or emission spectra of the sensory probe, suggesting that energy absorption is not the reason for fluorescence quenching.…”

BODIPY-based fluorescent sensors for detection of explosives

“…Meanwhile, static quenching refers to the formation of a non-fluorescent complex between a fluorescent probe and analytes. 18 The prevalent way to examine whether the quenching is a static or a collision process is based on fluorescence lifetime changes in the absence or presence of explosive quenchers, given by the ratio of lifetime τ 0 / τ . The τ 0 / τ ratio is plotted versus the quencher concentrations as follows: in static quenching, τ 0 / τ = 1 ; in collisional quenching, τ 0 / τ = F 0 / F ≠ 1 .…”

Ion recognition by 1,2,3‐triazole moieties synthesized via “click chemistry”

“…The past few decades have witnessed an immense technological revolution in ion detection techniques resulting into evolution of ion sensing probes wherein absorption and emission spectroscopy have proved to be among the best techniques for qualitative and quantitative analyses, [74,75] wherein the alteration in electronic content of ligand upon interacting with ion is depicted by variation in absorption maxima and/or shift in wavelength. Some commonly implemented techniques have been mentioned here and acclaimed by the scientific community all over the world for providing accurate and precise information presented conveniently as graphical or pictorial representation that confirm ion sensing.…”