title: Spectroscopic Studies on the Interaction of Metallic Ions with an Imidazolyl-Phenolic System.
abstract: A fluorescent imidazolyl-phenolic compound was applied on the detection of metallic species (Cu(2+), Al(3+), Cr(3+) and Fe(3+)) in a CH3CN/H2O (95/5, v/v) media. The presence and concentration of these cations altered significantly the emission profile of the probe, mainly lowering the signal intensity at 466 nm, while a new emission band around 395 nm appeared (for the trivalent ions). These results were rationalized as a combination of collisional quenching (KSV in the 10(3)-10(4) L mol(-1) range) and formation of a coordinated compound. The later disrupts the Excited State Intramolecular Proton Transfer that regulates the keto-enol tautomerism originally present on the free probe. Since the quenching efficiency and the obtained emission profiles are drastically different for Cu(2+) and Fe(3+) ions, this allows their differential recognition.
authors.affiliation: Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, Brazil.
authors.forename: Ronaldo Barros
authors.initials: RB
authors.lastname: Orfão
authors.affiliation: Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, Brazil.
authors.forename: Jessica
authors.initials: J
authors.lastname: Alves
authors.affiliation: Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, Brazil. fernando.bartoloni@ufabc.edu.br.
authors.forename: Fernando Heering
authors.initials: FH
authors.lastname: Bartoloni
keywords: Chemosensor; Copper(II); ESIPT; Fluorescent probe; Iron(III)