科研之友
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摘要
A new chemosensor (ProE) based on a functionalized porphyrin for colorimetric and fluorometric detection of cadmium ions (Cd2+) was outlined. ProE displays a distinct color change, as well as dramatic ratiometric variations in absorption and fluorescent emission spectra upon exposure to Cd2+. This condition allows the detection of the analyte at concentrations as low as 0.073 mu M. The dual chromo-and fluorogenic responses of the probe are attributed to the formation of a 1:1 Cd2+/ProE complex, which ultimately affects its optical properties. The sensor also exhibited high selectivity and sensitivity toward Cd2+ over other common metal ions in a moderate pH range, leading to potential fabrication of both "naked-eye" and ratiometric fluorescent detection of Cd2+.
