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From yellow to pink using a fluorimetric and colorimetric pyrene derivative and mercury (II) ions

2014; Elsevier BV; Volume: 110; Linguagem: Inglês

10.1016/j.dyepig.2014.04.012

1873-3743

Daniela Pinheiro, Catherine S. P. De Castro, J. Sérgio Seixas de Melo, Elisabete Oliveira, Cristina Núñez, Adrian Fernández‐Lodeiro, José Luís Capelo, Carlos Lodeiro,

Analytical Chemistry and Sensors

A new simple and multifunctional fluorescent probe based on pyrene linked through an imine bond to a hydroxyphenol unit was synthesised, fully characterized and investigated in solution. Additionally, its behaviour in the presence of several ions (H+, Zn2+, Cd2+, Cu2+, Ni2+, Pb2+, Fe2+, Hg2+ and Al3+) was investigated in CH2Cl2. It was found that the absorption spectra of probe 1 shows no differences for all ions titrations except in the presence of H+ and Hg2+ where a new longer wavelength band becomes visible (inducing a colour change from yellow to orange and pink, respectively). In the emission, a blue-shift and an enhancement of the fluorescence of the probe for all metal ions was observed with the exception of Al3+ where no detectable changes could be observed. The probe was found to be selective for Hg2+ ion at low concentrations (till one equivalent).