(Oligo)thienyl-imidazo-benzocrown ether derivatives: Synthesis, photophysical studies and evaluation of their chemosensory properties
2011
Batista, Rosa M.F. | Oliveira, Elisabete | Costa, Susana P.G. | Lodeiro, Carlos | Raposo, M. Manuela M.
A series of novel (oligo)thienyl-imidazo-benzocrown ethers were synthesised through a simple method and evaluated as fluorimetric chemosensors for transition metal cations. Interaction with Ni²⁺, Pd²⁺, and Hg²⁺ in ACN/DMSO solution (99:1) was studied by absorption and emission spectroscopy. Chemoselectivity studies in the presence of Na⁺ were also carried out and a fluorescence enhancement upon chelation (CHEF) effect was observed following Hg²⁺ complexation. Considering that most systems using fluorescence spectroscopy for detecting Hg²⁺ are based on the complexation enhancement of the fluorescence quenching (CHEQ) effect, the present work represents one of the few examples for sensing of Hg²⁺ based on a CHEF effect.
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