“…Notably, a limit of detection (LOD) for Hg(II) was calculated to be 5 nM according to the equation C lim = 3δ/ k , which is lower than the maximum permissible level (10 nM) of Hg(II) in drinking water specified by the U.S. Environmental Protection Agency (EPA) 7 , 46 . Additionally, the sensitivity of this proposed method is also found to be comparable to other reported methods for Hg(II) detection as summarized in Table S2 (ESI†) 6 – 8 , 12 , 13 , 17 , 19 – 22 , 47 – 53 . Figure 5 ( a ) Luminescence emission spectra of 1.0 μM complex 1 in Tris-HNO 3 buffer solution (pH 7.0) containing 0.4 μM Ag nanoparticles and different concentrations of Hg(II) (from bottom to top: 0, 20, 40, 60, 80, 100, 120, 140, 160, 180, 220, 270, 360, and 520 nM).…”
Section: Resultssupporting
confidence: 70%
“…Among several heavy metal ions, sensing of mercuric (Hg(II)) ions has attracted growing attention due to their acute toxicity 5 . Hg(II) can accumulate in vital organs through the food chain, posing a severe threat to the health of humans and animals 6 . Therefore, monitoring the levels of Hg(II) in aquatic ecosystems is of great significance.…”
A novel luminescent turn-on detection method for Hg(II) was developed. The method was based on the silver nanoparticle (AgNP)-mediated quenching of Ir(III) complex 1. The addition of Hg(II) ions causes the luminescence of complex 1 to be recovered due to the oxidation of AgNPs by Hg(II) ions to form Ag(I) and Ag/Hg amalgam. The luminescence intensity of 1 increased in accord with an increased Hg(II) concentration ranging from 0 nM to 180 nM, with the detection limit of 5 nM. This approach offers an innovative method for the quantification of Hg(II).
“…Notably, a limit of detection (LOD) for Hg(II) was calculated to be 5 nM according to the equation C lim = 3δ/ k , which is lower than the maximum permissible level (10 nM) of Hg(II) in drinking water specified by the U.S. Environmental Protection Agency (EPA) 7 , 46 . Additionally, the sensitivity of this proposed method is also found to be comparable to other reported methods for Hg(II) detection as summarized in Table S2 (ESI†) 6 – 8 , 12 , 13 , 17 , 19 – 22 , 47 – 53 . Figure 5 ( a ) Luminescence emission spectra of 1.0 μM complex 1 in Tris-HNO 3 buffer solution (pH 7.0) containing 0.4 μM Ag nanoparticles and different concentrations of Hg(II) (from bottom to top: 0, 20, 40, 60, 80, 100, 120, 140, 160, 180, 220, 270, 360, and 520 nM).…”
Section: Resultssupporting
confidence: 70%
“…Among several heavy metal ions, sensing of mercuric (Hg(II)) ions has attracted growing attention due to their acute toxicity 5 . Hg(II) can accumulate in vital organs through the food chain, posing a severe threat to the health of humans and animals 6 . Therefore, monitoring the levels of Hg(II) in aquatic ecosystems is of great significance.…”
A novel luminescent turn-on detection method for Hg(II) was developed. The method was based on the silver nanoparticle (AgNP)-mediated quenching of Ir(III) complex 1. The addition of Hg(II) ions causes the luminescence of complex 1 to be recovered due to the oxidation of AgNPs by Hg(II) ions to form Ag(I) and Ag/Hg amalgam. The luminescence intensity of 1 increased in accord with an increased Hg(II) concentration ranging from 0 nM to 180 nM, with the detection limit of 5 nM. This approach offers an innovative method for the quantification of Hg(II).
“…On the other hand, CH 3 Hg + is familiar for its more harmful nature than the inorganic form due to its high liposolubility and neurotoxicity. 3 The organic form of mercury has an excellent affinity toward thiol groups of cysteine and cysteine-containing proteins and, thus, showed extensive biotoxicity in living organisms. 4 Due to these environmental and health issues, the detection and monitoring of mercury ions (Hg 2+ ) and CH 3 Hg + have become a prime topic for chemists in recent years.…”
Mercury (Hg 2+ )-triggered desulfurization of 1,3dithiolane to the formyl group formation process has been utilized here to develop a norbornene-based reaction-triggered ESIPT active probe (NT). Mercury (Hg 2+ ) activated the excited-state proton transfer (ESIPT) process of both NT and its water-soluble polymer Poly-PEG-NT to change the emission from colorless to cyan-green. Due to the Hg 2+ -sensitive reaction site, NT and Poly-PEG-NT serve as highly selective and ultrafast detection systems with a limit of detection (LOD) of 8.2 nM and 107 nM, respectively. Additionally, NT can detect the organic mercury species (CH 3 Hg + ) with a quick response time and an impressive LOD of 1.1 μM. Due to the water-soluble nature of Poly-PEG-NT, it has the capability of detecting Hg 2+ in pure aqueous meda. Both these probes are capable of detecting Hg 2+ in both environmental and biological systems with excellent efficiency. Overall, the easy synthesis, cost-effectiveness, ultrafast detection, high selectivity, and sensitivity of NT and Poly-PEG-NT toward Hg 2+ /CH 3 Hg + can be used for practical purposes with efficiency to counter mercury toxicity.
“…In recent years, smart materials have been studied extensively for their important applications in molecular switches, − white light-emitting diodes, − information storage, , anti-counterfeiting, , separation and detection, − drug delivery, , and other fields. − Smart material molecules can reversibly change their physical and chemical properties under different external stimuli. , Among various external stimuli, including light energy, electrical energy, and chemical energy, light is the most suitable and convenient source of clean energy and has advantages of precise control as a stimulus source and energy-saving and environmental protection characteristics. Previously reported light stimulation of smart molecules includes the trans-to-cis isomerization of azobenzene and stilbene derivatives, − photocyclization of diarylethylenes, − [2 + 2] cycloaddition of alkenes, − and [4 + 4] photodimerization of anthracene. − Photoinduced trans-to-cis isomerization has attracted much attention in inorganic and organic chemistry, materials science, and biology.…”
Five lanthanide complexes
constructed from a stilbene derivative,
(E)-N′,N′-bis(pyridin-2-ylmethyl)-4-styrylbenzoyl hydrazide (HL),
and two β-diketonates (2-thenoyltrifluoroacetonate, tta), with
or without a trifluoroacetate anion (CF3CO2
–), namely, [Ln(tta)2(HL) (CF3CO2)] [LnC45H32F9N4O7S2, Ln = La (1), Nd (2), Eu (3), or Gd (4)] and [Yb(tta)2(L)] (YbC43H31F6N4O5S2 (5), L = deprotonated HL),
were synthesized and characterized. Crystals of these five complexes
were obtained and analyzed by single-crystal X-ray diffraction. These
complexes all belonged to the monoclinic P21/c space group. For La3+, Nd3+, Eu3+, and Gd3+, the central lanthanide ion
was nine-coordinate with a monocapped twisted square antiprism polyhedron
geometry. The central Yb3+ ion of complex 5 was eight-coordinate with a distorted double-capped triangular prism
polyhedron geometry. Among the five complexes, trans-to-cis photoisomerization
of the stilbene group in gadolinium complex 4 showed
the largest quantum yield. Complexes 2, 3, and 4 showed dual luminescence and photoisomerization
functions. The luminescence change of complex 3 was reversible
upon the trans-to-cis photoisomerization process. The sensitization
efficiencies of luminescent europium complex 3 in acetonitrile
solutions and in the solid state were 49.9 and 42.6%, respectively.
These medium sensitization efficiencies led to the observation of
simultaneous photoisomerization and luminescence, which further confirmed
our previous report that photoisomerization of the stilbene group
within complexes was related to the lanthanide ion energy level and
whether a ligand-to-metal center or ligand-to-ligand charge-transfer
process was present. In complexes 1–5, in addition to the intramolecular absorption transition of the
ligand itself (IL, πHL–πHL
* and πtta–πtta*), the presence of a ligand-to-ligand
charge-transfer transition between tta and HL (LLCT, πtta–πHL
* or πHL–πtta
*) indicated whether the triplet-state
energy of HL was able to transfer to the excited energy level of the
lanthanide ions, leading to different extents of HL photoisomerization.
These results provide an important route for the design of new dual-function
lanthanide-based optical switching materials.
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