Imidazo-benzo-15-crown-5 ether bearing arylthienyl and bithienyl moieties as no...

• Author(s): Batista, Rosa M. F. ; Oliveira, Elisabete ; Costa, Susana P. G. ; Lodeiro, Carlos ; Raposo, M. Manuela M.
• Date: 2011
• Persistent ID: http://hdl.handle.net/1822/15118
• Origin: RepositóriUM - Universidade do Minho
• Subject(s): Crown ethers; Arylthiophene; Bithiophene; Imidazole; Fluorescent chemosensors; CHEQ effect; Pd2+; Cu2+; F-
• Document Type: Article
• Language: English

Description

Novel fluorescent ionophores bearing imidazo-arylthienyl or imidazo-bithienyl pi-conjugated bridges functionalized with one or two fused benzo-15-crown-5 ethers as receptor units are reported. The sensing ability of the compounds in the presence of metallic cations (Li+, Na+, K+, Ca2+, Zn2+, Cu2+, Ni2+, Pd2+ and Hg2+) and fluoride ion was studied in MeCN/DMSO solutions by absorption and emission spectroscopy. The experimental results indicate that all compounds could act as selective fluorimetric sensors for Cu2+ and Pd2+ and also for the fluoride ion, in the case of the bis-substituted crown ether derivatives.