Colorimetric and fluorescence sensing of anions using thiourea based coumarin receptors

Ghosh, Kumaresh; Adhikari, Suman

doi:10.1016/j.tetlet.2006.09.035

Cited by 93 publications

(29 citation statements)

References 23 publications

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“…Although the determination of fluorescence quenching is able to give important knowledge on the photophysical processes occurring in the formation of coumarin complexes, few fluorescence quenching studies have been performed on the coumarins until now, most of them concerning only organic quenchers, and none the lanthanides [26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Fluorescence Quenching of Two Coumarin-3-carboxylic Acids by Trivalent Lanthanide Ions

Cissé¹,

Djandé²,

Capo‐Chichi³

et al. 2016

J Fluoresc

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The effects of various trivalent lanthanide ions (acetates of Ce, Er, Eu, Nd) on the electronic absorption and fluorescence spectra of un-substituted coumarin-3-carboxylic acid (CCA) and 7-N,N-diethylamino-coumarin-3-carboxylic acid (DECCA) have been investigated in dimethylsulfoxide (DMSO) at room temperature. Depending on the lanthanide ion nature and concentration, significant spectral changes of absorption bands occurred for both coumarin derivatives. These spectral changes were attributed to the formation of ground-state complexes between the coumarin carboxylate derivatives and lanthanide ions. The fluorescence quenching of CCA and DECCA upon increasing the lanthanide ion concentration was studied. Different quantitative treatments, including the Stern-Volmer equation, the Perrin equation and a polynomial equation, were applied and compared in order to determine the nature of the quenching mechanisms for both coumarin derivatives. The results suggested the contribution of both dynamic and static quenching. Significant differences of CCA and DECCA fluorescence quenching efficiency were also observed, depending on the lanthanide ion. DECCA fluorescence lifetime measurements, performed in the absence and in the presence of Ln, confirmed a contribution of static quenching.

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Section: Introductionmentioning

confidence: 99%

Fluorescence Quenching of Two Coumarin-3-carboxylic Acids by Trivalent Lanthanide Ions

Cissé¹,

Djandé²,

Capo‐Chichi³

et al. 2016

J Fluoresc

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“…[29,30] Gunnlaugsson and co-workers have developed similar chemosensors for anions by using anthracene-based fluorescent sensors. [20,31,32] Other examples of recently synthesised thiourea sensors include hosts with the thiourea group linked to fluorescent sensor moieties by a rigid hydrazine spacer selective for acetate, [33][34][35][36] Hosts based on coumarin sensors that act as both fluorescent and colorimetric sensors [37] and compounds that utilise cooperativity between the thiourea group and an amine group adjacent to a naphthalimide sensor are also known. [38,39] Sensors using 2 + (4) binds anions in both 1:1 and 1:2 species, whereas the free ligand is ineffective because of intramolecular NH···N hydrogen bonding.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Anion Binding from Unusual Coordination Modes of Bis(thiourea) Ligands in Platinum Group Metal Complexes

Soriano¹,

Lenthall²,

Anderson³

et al. 2010

Chemistry A European J

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Treatment of a range of bis(thiourea) ligands with inert organometallic transition-metal ions gives a number of novel complexes that exhibit unusual ligand binding modes and significantly enhanced anion binding ability. The ruthenium(II) complex [Ru(η(6)-p-cymene)(κS,S',N-L(3)-H)](+) (2b) possesses juxtaposed four- and seven-membered chelate rings and binds anions as both 1:1 and 2:1 host guest complexes. The pyridyl bis(thiourea) complex [Ru(η(6)-p-cymeme)(κS,S',N(py)-L(4))](2+) (4) binds anions in both 1:1 and 1:2 species, whereas the free ligand is ineffective because of intramolecular NH⋅⋅⋅N hydrogen bonding. Novel palladium(II) complexes with nine- and ten-membered chelate rings are also reported.

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“…Upon interaction with H 2 PO 4 − , the reduction potential of compound 2 was enhanced, namely the electron transfer from the electron rich phenol moiety bonded with H 2 PO 4 − to the electron deficient -NO 2 moiety became more feasible. Upon further addition of H 2 PO 4 − , it appeared that the deprotonated species LH − , being more electron rich compared to the hydrogenbonded complex with H 2 PO 4 − , activated the ICT process more efficiently 23 . Compared with compound 1, the different interacted mechanism was induced by the different site which the nitro group existed.…”

Section: Fluorescence Titrationmentioning

confidence: 99%

The Different Recognition Mechanism of Carbazole Derivatives for Biological Important Anion: Theory and Experiment

Shang

Jia

et al. 2013

J. Chil. Chem. Soc.

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Colorimetric and fluorescence sensing of anions using thiourea based coumarin receptors

Cited by 93 publications

References 23 publications

Fluorescence Quenching of Two Coumarin-3-carboxylic Acids by Trivalent Lanthanide Ions

Fluorescence Quenching of Two Coumarin-3-carboxylic Acids by Trivalent Lanthanide Ions

Enhanced Anion Binding from Unusual Coordination Modes of Bis(thiourea) Ligands in Platinum Group Metal Complexes

The Different Recognition Mechanism of Carbazole Derivatives for Biological Important Anion: Theory and Experiment

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