Fluorescence Sensors Based on Hydroxycarbazole for the Determination of Neurodegeneration-Related Halide Anions



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González Ruiz, Víctor and Cores, Ángel and Caja, M. Mar and Sridharan, Vellaisamy and Villacampa, Mercedes and Martín, M. Antonia and Olives Barba, Ana Isabel and Menéndez Ramos, José Carlos (2022) Fluorescence Sensors Based on Hydroxycarbazole for the Determination of Neurodegeneration-Related Halide Anions. Biosensors, 12 (3). p. 175. ISSN 2079-6374

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Official URL: https://doi.org/10.3390/bios12030175


The environmental presence of anions of natural origin or anthropogenic origin is gradually increasing. As a tool to tackle this problem, carbazole derivatives are an attractive gateway to the development of luminescent chemosensors. Considering the different mechanisms proposed for anion recognition, the fluorescence properties and anion-binding response of several newly synthesised carbazole derivatives were studied. Potential anion sensors were designed so that they combined the native fluorescence of carbazole with the presence of hydrogen bonding donor groups in critical positions for anion recognition. These compounds were synthesised by a feasible and non-expensive procedure using palladium-promoted cyclodehydrogenation of suitable diarylamine under microwave irradiation. In comparison to the other carbazole derivatives studied, 1-hydroxycarbazole proved to be useful as a fluorescent sensor for anions, as it was able to sensitively recognise fluoride and chloride anions by establishing hydrogen bond interactions through the hydrogen atoms on the pyrrolic nitrogen and the hydroxy group. Solvent effects and excited-state proton transfer (ESPT) of the carbazole derivatives are described to discard the role of the anions as Brönsted bases on the observed fluorescence behaviour of the sensors. The anion–sensor interaction was confirmed by 1H-NMR. Molecular modelling was employed to propose a mode of recognition of the sensor in terms of complex stability and interatomic distances. 1-hydroxycarbazole was employed for the quantitation of fluoride and chloride anions in commercially available medicinal spring water and mouthwash samples.

Item Type:Article
Uncontrolled Keywords:fluorescent sensors; hydrogen bonds; carbazole derivatives; microwave-assisted synthesis; halide toxicity; halide quantitation
Subjects:Sciences > Chemistry > Analytic chemistry
Medical sciences > Pharmacy
ID Code:74829
Deposited On:07 Oct 2022 10:54
Last Modified:10 Oct 2022 07:26

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