Abstract
Two new binuclear Ag(I) complexes of the types, [Ag2(Mebba)2(fumarate)]·2C2H5OH (1) and [Ag2(Meobb)2(μ-Cl)2] (2) (Mebba = bis(N-methylbenzimidazol-2-ylmethyl) aniline, Meobb = 1,3-bis(N-ethyl-benzimidazol-2-yl)-2-oxopropan), have been synthesized and characterized. Structural analysis showed that silver(I) centre in two complexes were both four-coordinated distorted tetrahedron geometry, but their bridging modes are significantly different: bridged by the fumarate in complex 1, μ2-Cl monoatomic bridging in complex 2. The electrochemical sensing performances of carbon paste electrode modified with silver(I) complex 1 (CPE-1) and complex 2 (CPE-2) towards H2O2 were investigated by chronoamperometry in 0.2 M phosphate buffer solution (PBS, pH = 6) at −0.2 V. The CPE-1 exhibits a wide linear detection range from 0.5 μM to 4.0 mM and lower detection limit 0.61 μM with a relatively high sensitivity of 9.9935 µA/mM, and has excellent anti-interference ability and stability. There is not electrochemical H2O2-sensing performance for the CPE-2, which may be due to the fact that silver(I) ions and chloride ions form a more stable complex that is not easy to combine with hydrogen peroxide to form a catalytic transition state. The research results show that silver(I) complexes based on bisbenzimidazole ligands have the potential to become electrode materials.
Published Version
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