title: Fluorescence “Turn-Off” and Colorimetric Sensor for Fe2+, Fe3+, and Cu2+ Ions Based on a 2,5,7-Triarylimidazopyridine Scaffold
creator: Sasan, Sonakshi 
creator: Chopra, Tavishi 
creator: Gupta, Annah 
creator: Tsering, Dolma 
creator: Kapoor, Kamal K
creator: Parkesh, Raman 
subject: QR Microbiology
description: 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.
publisher: ACS Publications 
date: 2022-03-22
type: Article
type: PeerReviewed
relation: https://pubs.acs.org/doi/10.1021/acsomega.1c07193
identifier:   Sasan, Sonakshi  and Chopra, Tavishi  and Gupta, Annah  and Tsering, Dolma  and Kapoor, Kamal K and Parkesh, Raman   (2022) Fluorescence “Turn-Off” and Colorimetric Sensor for Fe2+, Fe3+, and Cu2+ Ions Based on a 2,5,7-Triarylimidazopyridine Scaffold.  ACS Omega, 7 (13).  pp. 11114-11125.      
relation: http://crdd.osdd.net/open/2994/