Abstract
Here, the cathodic electrochemiluminescence (ECL) behavior of 3,4,9,10-perylenetetracar-boxylic acid (PTCA) coreacted with hydrogen peroxide was firstly reported. The quenching effect of Fe-MIL-88 MOFs (iron based metal-organic framework) on the ECL of PTCA was found, and the ECL quenching mechanism was investigated, which was speculated to be via the resonance energy transfer from PTCA to Fe-MIL-88 MOFs and steric hindrance effect from Fe-MIL-88 MOFs. Combining with dual molecular recognition strategy and the quenching effect of Fe-MIL-88 MOFs on the ECL of PTCA-H2O2 system, an “on-off” ECL sensor was designed to detect dopamine (DA) with a broad linear range (five orders of magnitude). The detection limit was low to 2.9×10−13M. The PTCA-H2O2 system would provide a new ECL platform, especially for constructing enzyme based ECL sensor with H2O2 as product in enzymatic reaction. Furthermore, the electrochemiluminescence resonance energy transfer between Fe-MIL-88 metal–organic framework and PTCA would expand a new application of Fe-MIL-88 MOFs in ECL field. The dual molecular recognition strategy ensured the selectivity of the sensor for DA detection.
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