%0 Journal Article
%A Sasan, Sonakshi 
%A Chopra, Tavishi 
%A Gupta, Annah 
%A Tsering, Dolma 
%A Kapoor, Kamal K
%A Parkesh, Raman 
%D 2022
%F open:2994
%I ACS Publications 
%J ACS Omega
%N 13
%P 11114-11125
%T Fluorescence “Turn-Off” and Colorimetric Sensor for Fe2+, Fe3+, and Cu2+ Ions Based on a 2,5,7-Triarylimidazopyridine Scaffold
%U http://crdd.osdd.net/open/2994/
%V 7
%X Two cyanoimidazopyridine-based sensors (SS1 and SS2) were explored for the colorimetric and fluorometric detection of Fe2+, Fe3+, and Cu2+ ions in the semi-aqueous medium. The “turn-off” fluorescence response of both sensors to these ions was due to the restriction in internal charge transfer. Job’s plot and semi-empirical calculations revealed that SS1 and SS2 complexed with Cu2+ ions in a 1:1 ratio and Fe2+/3+ ions in a 2:1 ratio, respectively. The sensors were found to have high binding constant (Ka) values and low detection limit values. FMO analysis using the semi-empirical quantum mechanics method revealed the decrease in energy gap after complexation with metal ions. Sensor-coated filter paper strips were prepared and analyzed, where the color changes in the strips could be utilized for the real-time detection of Fe2+, Fe3+, and Cu2+ ions.
%Z The copyright of this article belongs to ACS Publications