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A new silver(I) inorganic polymer, formulated as {[Ag 4 (H 2 ebidc) (NH 3 ) 4 ](H 2 O) 2 } n  (H 2 ebidc = 2,2’-(ethane-1,2-diyl)bis(1H-imidazole-4,5-dicarboxylic acid), was synthesized and characterized by X-ray crystallography, elemental analysis and IR spectroscopy. The crystal analysis results showed that the four silver(I) ions were linked by the H 2 ebidc 4−  ligand to form a tetranuclear cluster subunit, and then a one-dimensional ring-to-ring chain was constructed through the Ag(I)-Ag(I) bonds between the cluster subunits. Electrochemical sensing performance of the Ag(I) inorganic polymer modified carbon paste electrode (CPE-Ag) for H 2 O 2  was evaluated by chronoamperometry in 0.2 M phosphate buffer saline (PBS, pH = 6) at −0.2 V. The electrochemical H 2 O 2  sensor CPE-Ag was found to lead to a linear response from 0.5 μM to 4.0 mM with a detection limit of 0.32 μM. Moreover, the sensor also revealed good anti-interference ability and stability. The above studies proved that Ag(I) inorganic polymers can be used as effective components of electrode materials for the electrochemical recognition of H 2 O 2 .

A new Ag(I) inorganic polymer consisting of Ag(I)-Ag(I) bonds for electrochemical sensing of H 2 O 2