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Pyrenylthioureayl Alanine as a Switch‐On Fluorescent Sensor for Hg(II) Ions
Author(s) -
Bag Subhendu Sekhar,
De Suranjan
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201802249
Subject(s) - chemistry , fluorescence , titration , metal ions in aqueous solution , detection limit , alanine , ion , binding constant , stoichiometry , aqueous solution , metal , mercury (programming language) , solvent , photochemistry , inorganic chemistry , analytical chemistry (journal) , binding site , amino acid , organic chemistry , biochemistry , physics , chromatography , quantum mechanics , computer science , programming language
Fluorescence 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 , PyTU Ala ) as an efficient switch‐on fluorescent sensor for sensing of Hg 2+ ion in semi‐aqueous solvent system (7:3 H 2 O:ACN). The probe also shows binding interaction with Cu 2+ 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 (10 10 M −1 ) constant for Hg 2+ ion. The UV‐visible absorption, IR‐spectroscopic study, NMR titration, and a theoretical calculation supported the probe's binding to Hg 2+ ion through the coordination with two sulphur atoms of two iminothioureayl moieties of two pyrenylthioureayl alanines.