Abstract
A new hydrophilic cyclometallated ruthenium complex Ru1-B with 4,4′-dicarboxylate-2,2′-bipyridine (abbreviated as dcbpy) and 2-(2-thienyl)pyridine (abbreviated as thpy) as ligands was successfully synthesized to selectively detect mercury ion in water. Only upon addition of mercury ions, the aqueous solution of the complex exhibits very remarkable color change from red to yellow with a dramatic blue-shift (120nm) of MLCT absorption bands. The detection limit of Hg2+ for this chemo-sensor in HEPES aqueous solution was 0.59μM. Interestingly, the complex can be recovered from complex-Hg2+ both in solution and silica gel plates by adding I−. Therefore, it can be used as a sensitive “naked-eye” indicator for Hg2+ in natural environment.
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