Abstract
A pair of isostructural ionic nickel(II) chain coordination polymers, {[Ni(bbbm)(H2O)4]·ATBIP·2DMF·2H2O}n (CP 1) and {[Ni(bbbm)(H2O)4]·ATBIP·2DMA·2H2O}n (CP 2) with the multi-functional ATBIP2- anion and flexible bbbm linker was synthesized under ambient condition [H2ATBIP = 5-amino-2,4,6-tribromoisophthalic acid, bbbm = 1,4-bis(benzimidazole-1-methyl)benzene]. Furthermore, the composite of CP 1 with carbon nanotubes (CP 1@CNTs) was constructed by adopting “one pot” synthesis strategy. With the help of the hydrogen-bonded chain, CPs 1–2 extend into a 3D supramolecular framework with 1D channels occupied by the cosolvent molecules (DMF/DMA). Remarkably, CPs 1–2/GCE demonstrate cosolvent-dependent electrochemical sensing behavior to H2O2 and Fe3+. CP 1/GCE shows more sensitive oxidation sensing to H2O2 than CP 2/GCE in 0.1 M NaOH. Meanwhile, CP 1/GCE demonstrates sensitive reduction sensing to Fe3+ in 0.1 M H2SO4, while CP 2/GCE doesn't. Both CPs 1–2/GCE have similar oxidation sensing capabilities to ascorbic acid (AA) in 0.1 M H2SO4. Moreover, CP 1@CNTs/GCE shows superior electrochemical sensing performance to CP 1/GCE. The LOD of CP 1@CNTs/GCE for sensing of H2O2, AA and Fe3+ reaches 0.1 μM, 1.7 μM and 3.4 μM, respectively. Moreover, CP 1@CNTs/GCE was used in the sensitive detection of H2O2, AA and Fe3+ in the real-world samples.
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