A New Fluorescent Chemosensor for Cobalt(II) Ions in Living Cells Based on 1,8-Naphthalimide

Molecules

Xiao-Xiao Pang¹  Ying Fu¹  Yu-Long Liu¹  Liu Yang¹  Fei Ye¹  Ping Li¹  Lu Li¹  You-Quan Guo² 

[1] Department of Applied Chemistry, College of Science, Northeast Agricultural University, Harbin 150030, China;Heilongjiang Vocational College of Biology Science and Technology, Harbin 150025, China;

关键词: 1,8-naphthalimide;    colorimetric;    fluorescent;    cobalt(II) ions;    live cell imaging;   

DOI  :  10.3390/molecules24173093

来源: DOAJ

【 摘 要 】

In this work, a highly selective fluorescent chemosensor N-(2-(2-butyl-1,3-dioxo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl)hydrazine-1-carbonothioyl)benzamide (L) was prepared and characterized. An assay to detect the presence of cobalt(II) ions was developed by utilizing turn-on fluorescence enhancement with visual colorimetric response. Upon treatment with Co²⁺, a remarkable fluorescence enhancement located at 450 nm was visible to naked eyes accompanied with a distinct color change (from pink to colorless) in a CH₃CN/HEPES (4/1, v/v, pH = 7.4) solution due to the formation of a 1:1 complex at room temperature. In addition, the linear concentration range for Co²⁺ was 0−25 µM with the limit of detection down to 0.26 µM. Thus, a highly sensitive fluorescent method based on chelation-assisted fluorescence enhancement was developed for the trace-level detection of Co²⁺. The sensor was found to be highly selective toward Co²⁺ ions with a large number of coexisting ions. Furthermore, the L probe can serve as a fluorescent sensor for Co²⁺ detecting in biological environments, demonstrating its low toxic properties to organisms and good cell permeability in live cell imaging.

【 授权许可】

Unknown