A gadolinium(III)-coumarin complex based MRI/Fluorescence bimodal probe for the detection of fluoride ion in aqueous medium

By virtue of high affinity of Gadolinium(III) with fluoride, a novel MRI/fluorescence bimodal probe was prepared by self-assembly of Gd(III) based contrast agent with the coumarin-based fluorophore (CL). Upon addition of fluoride ion (F−) to the aqueous solution of EDTA-Gd(III)-CL, the replacement of coordination CL occurs, realizing switch-on both the longitudinal relaxivity (r1) and fluorescence responses, simultaneously. The fluorescence detection limit for fluoride ions was established at 0.15 μM. EDTA-Gd(III)-CL features of favorable selectivity towards F− for both relaxivity and fluorescence, reliability at physiological pH allow its potential application in biomedical diagnosis fields.

A fluoride-specific MRI/fluorescence bimodal probe was reported.203