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(Oligo)thienyl-imidazo-benzocrown ether derivatives: synthesis, photophysical studies and evaluation of their chemosensory properties |
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| Authors: | Batista Rosa M F Oliveira Elisabete Costa Susana P G Lodeiro Carlos Raposo M Manuela M |
| Affiliation: | a Centre of Chemistry, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal b BIOSCOPE Group, Physical-Chemistry Department, Faculty of Science, University of Vigo, Campus of Ourense, E-34002, Spain c REQUIMTE, Department of Chemistry, Faculty of Sciences and Technology, New University of Lisbon, 2829-516, Monte de Caparica, Portugal |
| Abstract: | 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. |
| Keywords: | Benzo-15-crown-5 ether (Oligo)thiophene Imidazole Fluorescent chemosensors Hg2+ Pd2+ CHEF effect |
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