121st General Meeting of the KCS

Type Poster Presentation
Area Organic Chemistry
Room No. Event Hall
Time 4월 19일 (목요일) 11:00~12:30
Code ORGN.P-405
Subject Highly Selectively Ratiometric Detection of trivalent Ions in Aqueous Buffered Solution by Fluorescent Probe Based on the Dipeptide receptor Using Aggregation-Induced Emission
Authors JOOHEE PARK, Keun Hyeung Lee*
Department of Chemistry, Inha University, Korea
Abstract A fluorescent probe (1) was synthesized based on the dipeptide receptor for hard metal ions using aggregation induced emission. 1 bearing a cyanostilbene fluorophore showed high selectivity for Al3+ and In3+ ions among various metal ions in purely aqueous solutions. Upon addition of increasing concentration of the trivalent ions, the significant enhancement of the emission at 600 and the decrease of the emission at 530 nm were observed. 1 with high metal binding affinities (4.97 × 106 M-1 for Al3+ and 3.26 × 106 M-1 for In3+) showed highly sensitive ratiometric responses to Al3+ and In3+ ions in aqueous buffered solution. Detection limits for Al3+ and In3+ ions are 441 nM and 395 nM, respectively, which was lower than the maximum allowable level of Al3+ in drinking water demanded by EPA. Job's plot analysis, pH titration experiments, and DLS measurements revealed that 1 self-assembled in the presence of the trivalent ions and formed into nanoparticles, resulting in the red emissions.
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