Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.



Novel nitro-substituted formazan derivatives: selective ratiometric and colorimetric chemosensors for fluoride anion sensing detectable by the naked eye

Author affiliations

Abstract

Two novel formazan derivatives, FNB and FDNB, were synthesized from the corresponding phenylhydrazones and characterized by various spectroscopic methods. The sensing ability of these formazan sensors towards different anions was determined in THF by a colorimetric UV-vis spectroscopy method. FNB had an efficient colorimetric sensing ability for fluoride anions by changing colour from red to green then blue with a Δλ shift of ca. 138 nm, whilst FDNB acted as a colorimetric sensor by changing colour from yellow to red with a Δλ shift of ca. 95 nm, which could be recognised by the naked eye. The detection limit of sensor FNB was found to be 0.051 ppm (under the WHO permitted level) in the presence of F anions. Moreover, the binding forms of F with the sensors were examined by 1H NMR experiments. These results indicated that sensors FNB and FDNB, containing nitro groups and hydrazo unit (–NH) hydrogen bond donation, exhibited high sensitivity and selectivity toward fluoride, which has biological importance.

Graphical abstract: Novel nitro-substituted formazan derivatives: selective ratiometric and colorimetric chemosensors for fluoride anion sensing detectable by the naked eye

Back to tab navigation

Supplementary files

Article information


Submitted
14 Apr 2020
Accepted
06 May 2020
First published
06 May 2020

New J. Chem., 2020, Advance Article
Article type
Paper

Novel nitro-substituted formazan derivatives: selective ratiometric and colorimetric chemosensors for fluoride anion sensing detectable by the naked eye

G. Turkoglu, New J. Chem., 2020, Advance Article , DOI: 10.1039/D0NJ01860K

Social activity

Search articles by author

Spotlight

Advertisements