Turn-on Fluorescent Chemosensor Based on an Amino Acid for Pb(II) and Hg(II) Ions in Aqueous Solutions and Role of Tryptophan for Sensing

Abstract

This communication presents a fluorescent chemosensor for detecting Pb(II) and Hg(II) in aqueous solutions. The sensor showed a turn-on response to Pb(II) by an enhancement of emission intensity at 380 nm and to Hg(II) by an enhancement of emission intensities at 380 and 475 nm. We have first characterized a unique function of tryptophan as a ligand as well as a quencher for recognition and fluorescent change by a metal binding event.

Optical methods for the detection of heavy metal ions

“…of metal ions). 90 Irradiation at 342 nm of the solution being analyzed induces emission at 378 and 395 nm. Other metal cations do not interfere with lead determination.…”

Luminescent chemosensor for Hg2+ ion based on a dinuclear Ru(II) complex containing open chain azacrown ether

“…Thus, a simple and inexpensive method that not only detects but also quantifies Hg 2+ is desirable for real-time monitoring of environmental, biological, and industrial samples. In this context, the luminescent sensors for Hg 2+ were developed quickly due to their advantages such as high sensitivity, good selectivity, quick response, and local observation [12][13][14][15][16]. On the other hand, different sensing mechanisms were reported for Hg 2+ luminescent probes [17][18][19][20].…”

Highly selective colorimetric and fluorescent detection for Hg2+ in aqueous solutions using a dipeptide-based chemosensor

“…In recent years, fluorescent chemosensors for HTM based on amino acids or peptides have received many attentions because they dissolved well in aqueous solutions and exhibited selective and sensitive fluorescent responses to specific metal ions. [21][22][23][24][25][26][27][28][29][30][31][32] On the other hand, it is very rare to developing colorimetric chemosensors based on peptides for monitoring HTM. In the present study, we synthesized a new colorimetric chemosensor based on a dipeptide containing a disulfide bond as following reasons.…”