Quenching of excited singlet states by metal ions

Kemlo, James A.; Shepherd, T. M.

doi:10.1016/0009-2614(77)85329-3

Cited by 192 publications

(92 citation statements)

References 9 publications

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“…Quenching of fluorescence of ligands by transition metal ions upon complexation is a rather common phenomenon and can be explained by processes such as magnetic perturbation, redox activity, electronic energy transfer, donation of lone pairs of electrons, etc. [46,47].…”

Section: Magnetic Studymentioning

confidence: 98%

Two Zn(II) and one Mn(II) complexes using two different hydrazone ligands: spectroscopic studies and structural aspects

et al. 2007

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Three new coordination complexes of Zn(II) and Mn(II) have been synthesised using two different tridentate N,N,O donor hydrazone ligands, Hpbh and Hacpbh respectively. The complexes [Zn(pbh) 2 ] (1) and [Zn (acpbh) 2 ] (2) have been synthesized by the treatment of ZnSO 4 Á 7H 2 O with Hpbh and Hacpbh hydrazone ligands, respectively. The Mn(II) complex [Mn(acpbh) 2 ] (3) was obtained on reacting Mn(NO 3 ) 2 Á 4H 2 O with the ligand Hacpbh.The ligands Hpbh and Hacpbh were prepared by condensing pyridine-2-carboxaldehyde and 2-acetylpyridine with benzhydrazide respectively. Inspite of varying the carbonyl functionality attached to the pyridine moiety present in the hydrazone ligands in both the Schiff bases, we obtained three mononuclear complexes 1, 2, and 3 which were clearly characterized from single crystal X-ray diffraction studies. Spectroscopic investigations like IR and UV/Vis have been carried out for 1, 2, and 3. Fluorescence studies have been performed for 1 and 2. For 3 cyclic voltammetry, room temperature magnetic study and EPR measurements have been recorded.

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Section: Magnetic Studymentioning

confidence: 98%

Two Zn(II) and one Mn(II) complexes using two different hydrazone ligands: spectroscopic studies and structural aspects

et al. 2007

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“…Although charge transfer and energy transfer have been recognized as important mechanisms of iron-mediated quenching of excited singlet states (31,32), cationic iron forms are inherently paramagnetic and therefore able to induce nonradiative deactivation (33). While the metal-binding moiety determines the affinity, the specificity, and the speed of the probe's response with the metal, it is the capacity to transduce that information to the fluorophore that determines the usefulness of a probe as an iron sensor.…”

Section: Iron Sensorsmentioning

confidence: 99%

A Review of Fluorescence Methods for Assessing Labile Iron in Cells and Biological Fluids

Espósito

Epsztejn

Breuer

et al. 2002

Analytical Biochemistry

221

175

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“…All the observed quenching efficiencies of the metal ions were found to be relatively similar to those reported with other fluorophores. 27,28 The ability of transition metal cations (Fe 3þ , Fe 2 , Cu 2þ and Cu þ ) to quench the fluorescence of triazene polymers (TCP-1 and TCP-2) has been explained on the basis of energy transfer processes. Energy transfer quenching can occur when the energy of the triazene chromophore excited state is larger than the excited-state energy of the quencher and furthermore, the electronic motions of the two species are coupled, involvingstacking formation.…”

Section: Resultsmentioning

confidence: 99%

Fluorescence Properties of Some Triazene Polyacrylates for Possible Sensor Applications

Buruiana¹,

Stroea²,

Buruiană³

2009

Polym. J.

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We report here a first study on the capacity of the triazene chromophore attached to a polymeric backbone to present fluorescence properties. The sensing ability of two triazene copolymers poly[1-(phenyl)-3-(2 acryloyloxyethyl)-3-methyl triazene-1-co-methyl methacrylate] (TCP-1) and poly[1-(paramethoxy-phenyl)-3-(2 acryloyloxyethyl)-3-methyl triazene-1-co-methyl methacrylate] (TCP-2) in dimethylformamide (DMF) has been investigated by fluorescence spectroscopy in tandem with a quenching experiments using a variety of metal ions (Fe 3þ , Fe 2 , Cu 2þ and Cu þ ), which suggests that these triazene polymers could find practical applications for detection of metal ions. The emission spectra exhibited strong fluorescence emissions at 375 nm (TCP-1) and 410 nm (TCP-2) respectively, while the ability of Fe 3þ , Fe 2þ , Cu 2þ and Cu þ to quench the fluorescence of the triazene fluorophore has been explained on the basis of energy transfer processes involving the triazene excited state and the metal ion. The corresponding Stern-Volmer representations for all fluorescence emission spectra were also described.KEY WORDS: Polyacrylates / Fluorescence / Quenching / Sensor / Fluorescence spectroscopy and its applications in biochemical, medical, and chemical research have improved rapidly during the past decade.1 The increased interest on fluorescence emission appears to be the consequence of numerous developments and the fast appearance of new fluorescence methods in explaining physical and life sciences research. Based on sensitivity, selectivity and non-destructive characteristics, fluorescence spectroscopy can evidence various photophysical properties like fluorescence intensity, 1 emission maximum, 2 anisotropy, excimer or exciplex formation, 3 etc., whereas any variation caused by connecting or interacting with special external species (for instance, metal ions) could be used for sensing purposes. 4 In fact, the fluorescent sensors can offer several distinct advantages in terms of sensitivity, selectivity, response time and local observation. In the case of selective fluorescence sensors for cation detection, the scientists made considerable efforts for the development of these kinds of systems.As a general characteristic, fluorescence quenching refers to any process which undergoes emission intensity changes of a given molecule. Fluorescence response can be generated by a variety of mechanisms, including excited state reactions, energy transfer, complex formation, and collision quenching, 5,6 while photoinduced electron transfer and electronic energy transfer are considered the two main deactivation pathway responsible for an efficient fluorescence inhibition.Our group has specially focused on designing and fabricating a diversity of (co)polymers bearing different fluorophores such as pyrene, 7,8 dansyl, 9 stilbene 10,11 or anthracene 12 characterized through high quantum yields and good extinction coefficients, making them attractive components of biological and chemical sensors.

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Quenching of excited singlet states by metal ions

Cited by 192 publications

References 9 publications

Two Zn(II) and one Mn(II) complexes using two different hydrazone ligands: spectroscopic studies and structural aspects

Two Zn(II) and one Mn(II) complexes using two different hydrazone ligands: spectroscopic studies and structural aspects

A Review of Fluorescence Methods for Assessing Labile Iron in Cells and Biological Fluids

Fluorescence Properties of Some Triazene Polyacrylates for Possible Sensor Applications

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