Abstract
The design, synthesis and photophysical evaluation of the Eu(III)-based chemosensor [Eu·1], is described. The sensors show large (ca. 300 fold) pH dependent luminescence enhancements for the Eu(III) lanthanide emission, i.e. it is ‘switched on’ in highly acidic media, between pH ca. 1.5 and 3.5 with a pKa of 2.4 (±0.1) when excited at 350 nm. The fluorescence spectra of [Eu·1], consisting of the quinoline emission, is also pH dependent, where the fluorescence is ‘switched on’ at 458 nm, in the pH region of 3–6, but the emission is quenched between pH 1.5 and 3. Both pH-intensity profiles display an ‘off–on–off’ bell-shape behaviour similar to that seen for many enzymatic pH dependent processes.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.