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A metal–organic framework (MOF) Cu(PDA)(DMF) was synthesized under mild mixed solvothermal conditions. It is constructed by 1,10-phenanthroline-2,9-dicarboxylic acid (H2PDA) and Cu2+ ions. The complex exhibits high peroxidase-like activity and can catalytically oxidize the colorless substrate 3,3′,5,5′-tetramethylbenzidine to a blue product in the presence of H2O2. However, the peroxidase-like activity of Cu(PDA)(DMF) can be potently inhibited in the presence of dopamine. Based on this phenomenon, the colorimetric detection of dopamine was demonstrated with good selectivity and high sensitivity. Cu(PDA)(DMF) showed good stability and robust catalytic activity, which has been employed in the detection of dopamine in human urine and pharmaceutical samples.
Wang et al. (Wed,) studied this question.