基于2,5,7-三芳基咪唑并吡啶支架的用于铁、亚铁和铜离子的荧光“关断”和比色传感器。
Fluorescence "Turn-Off" and Colorimetric Sensor for Fe, Fe, and Cu Ions Based on a 2,5,7-Triarylimidazopyridine Scaffold.
作者信息
Sasan Sonakshi, Chopra Tavishi, Gupta Annah, Tsering Dolma, Kapoor Kamal K, Parkesh Raman
机构信息
Department of Chemistry, University of Jammu, Jammu 180006, India.
CSIR-Institute of Microbial Technology, Chandigarh 160036, India.
出版信息
ACS Omega. 2022 Mar 22;7(13):11114-11125. doi: 10.1021/acsomega.1c07193. eCollection 2022 Apr 5.
Two cyanoimidazopyridine-based sensors (SS1 and SS2) were explored for the colorimetric and fluorometric detection of Fe, Fe, and Cu 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 Cu ions in a 1:1 ratio and Fe ions in a 2:1 ratio, respectively. The sensors were found to have high binding constant ( ) 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 Fe, Fe, and Cu ions.
研究了两种基于氰基咪唑并吡啶的传感器（SS1和SS2）用于在半水介质中比色和荧光检测Fe²⁺、Fe³⁺和Cu²⁺离子。两种传感器对这些离子的“关闭”荧光响应是由于内部电荷转移受到限制。乔布氏图和半经验计算表明，SS1与Cu²⁺离子以1:1的比例络合，而SS2与Fe²⁺离子以2:1的比例络合。发现这些传感器具有高结合常数（ ）值和低检测限。使用半经验量子力学方法进行的前线分子轨道分析表明，与金属离子络合后能隙减小。制备并分析了涂有传感器的滤纸，其中纸条上的颜色变化可用于实时检测Fe²⁺、Fe³⁺和Cu²⁺离子。
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