Isocyanonaphthalenes as extremely low molecular weight, selective, ratiometric fluorescent probes for Mercury(II).
Talanta
; 201: 165-173, 2019 Aug 15.
Article
en En
| MEDLINE
| ID: mdl-31122408
ABSTRACT
The specially designed chemical structure of our recently developed solvatochromic amino-isocyanonaphthalene (ICAN) dye family enables the selective detection of Hg2+ and at the same time is able to indicate the presence of Ag+. In addition to its easy preparation and nontoxic nature, ICAN is the lowest molecular weight dye reported for ratiometric fluorescent Hg2+ detection in water, so far. The basis of this double selectivity is the reduction of the isonitrile moiety to amine by a chemical reaction with Hg2+ resulting in a greater than 100â¯nm hypsochromic shift (and switch on of fluorescence) of the emission maximum relative to ICAN, whereas the complexation of Ag+ with the NC group yields an approximately 20â¯nm bathochromic shift (and quenching). In contrast, other common ions have little effect on the position of the emission maximum in aqueous medium. In completely aqueous medium at pHâ¯=â¯6, the limit of quantification was found to be lower than 17â¯nM and the limit of detection lower than 6â¯nM for Hg2+. The practical applicability of the method was demonstrated on dental amalgam.
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Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
Talanta
Año:
2019
Tipo del documento:
Article
País de afiliación:
Hungria