Methyl-functionalized Cd-based metal-organic framework for highly sensitive electrochemical sensing of dopamine
A Cd-based metal-organic framework(MOF)[Cd(BDC)(BPZ)(H2O)]n(1),where BPZ=3,3',5,5'-tetramethyl-1H,1'H-4,4'-bipyrazole and H2BDC=terephthalic acid,was designed and synthesized.Compound 1 possesses a 3D pore structure with—CH3 groups and free carboxyl oxygen atoms on the pore walls.The presence of methyl groups significantly enhances the hydrophobicity and stability of MOF.Moreover,the methyl group and uncoordinated carboxyl oxygen atomscan interact with dopamine(DA)molecules through hydrogen bonding or van der Waals inter-actions,endowing in 1 with sensitive electrochemical sensing properties for DA.The differential pulse voltammetry(DPV)test of the prepared 1/GCE electrode showed that it had a wide linear range of 0.4 to 764.7 μmol·L-1 for detecting DA,and the detection limit was as low as 56.8 nmol·L-1.The DPV response current of the electrode remained unchanged in the presence of common interferents.When the electrode was applied for real sample analy-sis,the recovery rates ranged from 95.23％to 100.90％.CCDC:2320732.
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