A new perylenediimide with NH functionality as a colorimetric and fluorescent probe for the selective detection of trivalent Fe3+ and Al3+ ions

作者：Suganya Sivalingam; Namgoong Jin Woong; Mutyala Anil Kumar; Velmathi Sivan; Kim Jae Pil; Park Jong S

来源：Journal of Photochemistry and Photobiology A: Chemistry , 2017, 344: 36-41.

DOI：10.1016/j.jphotochem.2017.04.036

• Perylenediimide
• NH binding unit
• Colorimetric sensing
• Al3+/Fe3+ ion detection
• Fluorescence enhancement
• Density functional theory

We report the synthesis of a new colorimetric probe RI, in which the perylene tetracarboxylicdiimide fluorophore is connected with an adamantly amine unit through the NH binding site. RI was tested with a variety of metal ions and exhibited a significant colorimetric transition in the presence of Fe3+ and Al3+ ions. No significant changes were observed with other metal ions. Absorption measurements indicated that trivalent metal ions Fe3+/Al3+ bind with RI and generate a stable complex. The presence of Fe3+ and Al3+ ions induces new absorption bands with shoulder peaks at 525 nm and 568 nm. The fluorescence intensity of R1 at 579 nm was significantly increased by the addition of Fe(3+)or Al3+ ions. Furthermore, RI was found to be sensitive towards these metal ions at micromolar concentrations. The stoichiometry of RI :Fe3+/Al3+ complexes were confirmed by ESI-MS analysis, and binding constants were calculated using Benesi-Hildebrand plots. The binding mode of RI with metal ions was proposed based on optimized structure from DFT calculation.

• 出版日期2017-7-1