Abstract
AbstractFluorescence sensing of heavy metal ion such as mercury is highly important because of its adverse effects on biological systems and on environment. Toward this end, we report herein a new and novel pyrenylthioureayl alanine amino acid (1, PyTUAla) as an efficient switch‐on fluorescent sensor for sensing of Hg2+ ion in semi‐aqueous solvent system (7:3 H2O:ACN). The probe also shows binding interaction with Cu2+ ion with an enhancement of emission. In both the cases 1:2 metal‐ligand binding stoichiometry is evident from Job's plot analyses. The detection limit is found to be 93 nM with a very high association (1010 M−1) constant for Hg2+ ion. The UV‐visible absorption, IR‐spectroscopic study, NMR titration, and a theoretical calculation supported the probe's binding to Hg2+ ion through the coordination with two sulphur atoms of two iminothioureayl moieties of two pyrenylthioureayl alanines.
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