A novel highly selective fluorescent chemosensor for Hg(II) in fully aqueous media

Meng, Xiang Ming; Zhu, Man; Guo, Qing

doi:10.1016/j.cclet.2007.08.003

Cited by 13 publications

(2 citation statements)

References 19 publications

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“…Such quenching is disadvantageous because it hampers a temporal separation of spectrally similar complexes with time-resolved fluorometry and because it produces lower output signal upon complexation. Moreover, among these literature findings, many researchers report water-soluble sensors for Hg 2+ (8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19), but few report sensors in pure water for Ag + (19)(20)(21) and Cd 2+ (19,20,22,23). Although HTM ions are relatively easy to chelate and detect in organic solvents, they are rather difficult to recognize directly in aqueous environments, due to their strong hydration.…”

Section: Introductionmentioning

confidence: 99%

Luminescent sensor for Cd²⁺, Hg²⁺ and Ag⁺ in water based on a sulphur‐containing receptor: quantitative binding–softness relationship

Saleh

2008

Luminescence

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A water-soluble, high-output fluorescent sensor, based on a lumazine ligand with a thiophene substituent for Cd(2+), Hg(2+) and Ag(+) metal ions, is reported. The sensor displays fluorescence enhancement upon Cd(2+) binding (log beta = 2.79 +/- 0.08) and fluorescence quenching by chelating with Ag(+) and Hg(2+) (log beta = 4.31 +/- 0.15 and 5.42 +/- 0.1, respectively). The mechanism of quenching is static and occurs by formation of a ground-state non-fluorescent complex followed by rapid intersystem crossing. The value of the Stern-Volmer quenching rate constant (k(q)) by Ag(+) ions is close to 6.71 x 10(12) mol/L/s at 298 K. The thermodynamic parameters (DeltaG, DeltaH and DeltaS) were also evaluated and indicated that the complexation process is spontaneous, exothermic and entropically favourable. The quantitative linear relationship between the softness values of Klopman (sigma(K)) or Ahrland (sigma(A)) and the experimental binding constants (beta) being in the order of Hg(2+) > Ag(+) > Cd(2+) suggests that soft-soft interactions are the key for the observed sensitivity and selectivity in the presence of other metal ions, such as: Pb(2+), Ni(2+), Mn(2+), Cu(2+), Co(2+), Zn(2+) and Mg(2+) ions.

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Section: Introductionmentioning

confidence: 99%

Luminescent sensor for Cd²⁺, Hg²⁺ and Ag⁺ in water based on a sulphur‐containing receptor: quantitative binding–softness relationship

Saleh

2008

Luminescence

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“…Some Hg 2+ sensors based on fluorescence enhancement or fluorescence quenching were reported . These were based on moieties of azoderivatives , N ‐dansylcarboxamide , anthryl acetamide , crown ethers , thiocarbamate , rhodamine , naphthalimide , anthraquinone , porphyrin , thiosemicarbazone , carbamodithioat , benzothiazole , fluorescein , phenylenediamine triamide , hydroxyquinoline , anthracene and phenoxazinone . Other Hg 2+ sensors, based on a more complex molecular architecture, were also reported .…”

Section: Introductionmentioning

confidence: 99%

A highly efficient and selective turn‐on fluorescent sensor for Hg²⁺, Ag⁺ and Ag nanoparticles based on a coumarin dithioate derivative

et al. 2013

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Based on chelation-enhanced fluorescence, a new fluorescent coumarin derivative probe 3(1-(7-hydroxy-4-methylcoumarin)ethylidene)hydrazinecarbodithioate for Hg(2+), Ag(+) and Ag nanoparticles is reported. Fluorescent probe acts as a rapid and highly selective "off-on" fluorescent probe and fluorescence enhancement by factors 5 to 12 times was observed upon selective complexation with Hg(2+), Ag(+) and Ag nanoparticles. The molar ratio plots indicated the formation of 1:1 complexes between Hg(2+) and Ag(+) with the probe. The linear response range covers a concentration range 0.1 × 10(-5) -1.9 × 10(-5) mol/L, 0.1 × 10(-5) -2.3 × 10(-5) mol/L and 0.146 × 10(-12) -2.63 × 10(-12) mol/L for Hg(2+), Ag(+) and Ag nanoparticles, respectively. The interference effect of some anions and cations was also tested.

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Pyrenylthioureayl Alanine as a Switch‐On Fluorescent Sensor for Hg(II) Ions

Bag

2018

ChemistrySelect

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Fluorescence sensing of heavy metal ion such as mercury is highly important because of its adverse effects on biological systems and on environment. Toward this end, we report herein a new and novel pyrenylthioureayl alanine amino acid (1, PyTU Ala) as an efficient switch-on fluorescent sensor for sensing of Hg 2 + ion in semi-aqueous solvent system (7:3 H 2 O: ACN). The probe also shows binding interaction with Cu 2 + ion with an enhancement of emission. In both the cases 1:2 metalligand binding stoichiometry is evident from Job's plot analyses. The detection limit is found to be 93 nM with a very high association (10 10 M À 1 ) constant for Hg 2 + ion. The UV-visible absorption, IR-spectroscopic study, NMR titration, and a theoretical calculation supported the probe's binding to Hg 2 + ion through the coordination with two sulphur atoms of two iminothioureayl moieties of two pyrenylthioureayl alanines.Research in the field of fluorescence sensing of heavy metal as well as transition metal ions is rapidly increasing because of their adverse effects on biological systems and on environment. [1] Among the various heavy metal ion-based pollutants, the mercury ion (Hg 2 + ) is in the frontline to adversely impact the environment and human health. [2] On the other hand, the transition metal ion copper (Cu 2 + ) is important for some physiological processes. [3a-b] However, an excess amount of Cu 2 + is highly toxic to organisms. [3c-d] Therefore design of fluorescent chemosensors for both Hg 2 + and Cu 2 + is highly important for the protection of environment as well as biological systems. A tremendous numbers of literatures exist which report the design of various types of chemosensors for the detection of either Cu 2 + or Hg 2 + ion. [4] As for an example, Goswami and coworkers have designed a novel, highly selective, ratiometric and colorimetric "off-on" type fluorescence sensor for Cu 2 + ion based on 1,8-diaminonaphthalene core. The complexation via pyrrolidinium nitrogens results in a large red shifted ICT emission which is the working principle of the probe. [4c] Based on the similar concept they have also introduced another novel and selective fluorescence sensor for Cu 2 + wherein the coordinating atoms are N and O. [4d] Many other efforts have been put forth in recent times to design the fluorescence sensors specific for the sensing of both Hg 2 + and Cu 2 + ions. [5] Few reports of chemosensors also exist which rely on the change in both color and fluorescence. [6] However, many of them suffer from shortcomings such as fluorescence quenching by paramagnetic Cu 2 + and Hg 2 + ions mostly due to electron transfer mechanism [7a-b] and spin-orbit coupling [7c] respectively. Moreover, many organic chemosensors for Hg 2 + suffer from shortcomings such as-poor water solublity, adverse surrounding effects, interference by other metal ions and low detection limit. [8] Therefore, the development of fluorescent switch-on chemosensors for the detection of Cu 2 + and/or Hg 2 + is highly desirable.A fruitf...

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A novel highly selective fluorescent chemosensor for Hg(II) in fully aqueous media

Cited by 13 publications

References 19 publications

Luminescent sensor for Cd²⁺, Hg²⁺ and Ag⁺ in water based on a sulphur‐containing receptor: quantitative binding–softness relationship

Luminescent sensor for Cd²⁺, Hg²⁺ and Ag⁺ in water based on a sulphur‐containing receptor: quantitative binding–softness relationship

A highly efficient and selective turn‐on fluorescent sensor for Hg²⁺, Ag⁺ and Ag nanoparticles based on a coumarin dithioate derivative

Pyrenylthioureayl Alanine as a Switch‐On Fluorescent Sensor for Hg(II) Ions

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A novel highly selective fluorescent chemosensor for Hg(II) in fully aqueous media

Cited by 13 publications

References 19 publications

Luminescent sensor for Cd2+, Hg2+ and Ag+ in water based on a sulphur‐containing receptor: quantitative binding–softness relationship

Luminescent sensor for Cd2+, Hg2+ and Ag+ in water based on a sulphur‐containing receptor: quantitative binding–softness relationship

A highly efficient and selective turn‐on fluorescent sensor for Hg2+, Ag+ and Ag nanoparticles based on a coumarin dithioate derivative

Pyrenylthioureayl Alanine as a Switch‐On Fluorescent Sensor for Hg(II) Ions

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Product

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About

Luminescent sensor for Cd²⁺, Hg²⁺ and Ag⁺ in water based on a sulphur‐containing receptor: quantitative binding–softness relationship

Luminescent sensor for Cd²⁺, Hg²⁺ and Ag⁺ in water based on a sulphur‐containing receptor: quantitative binding–softness relationship

A highly efficient and selective turn‐on fluorescent sensor for Hg²⁺, Ag⁺ and Ag nanoparticles based on a coumarin dithioate derivative