Two silver(I) complexes: Synthesis, structures, and electrochemical H2O2 sensing. Issue 3 (16th February 2022)

• Record Type: Journal Article
• Authors: Kong, Xiaoxia; Shen, Qinqin; Wan, Tiantian; Li, Kaiyi; Sun, Fugang; Wu, Huilu
• Is Part Of: Journal of the Chinese Chemical Society. Volume 69:Issue 3(2022)
• Page Start: 540
• Page End: 548
• Publication Date: 2022-02-16
• Subjects: Ag(I) complex -- crystal structure -- electrochemistry -- H2O2 sensor; Chemistry -- Periodicals; Electronic journals; 540.5
• DOI: 10.1002/jccs.202100543
• Languages: English
• ISSNs: 0009-4536

Abstract

Abstract: Two new silver(I) complexes, formulated as [Ag2 (L 1 )2 ](picrate)2 (1 ), {[Ag2 (L 2 )2 (terephthalate)](C2 H5 OH)3 (H2 O)}n (2 ) (L 1 = 1, 3‐bis(2‐benzimidazyl)benzene, L 2 = 1, 3‐bis(1‐methylbenzimidazol‐2‐yl)‐2‐thiapropane), were synthesized and characterized by X‐ray crystallography, elemental analysis, infrared, and UV–Vis spectroscopy. The crystal analysis results showed that the complexes exhibited different structures: binuclear for 1 and one‐dimensional polymeric for 2 . Their Ag(I) centers displayed different coordination geometric structures: two‐coordinated linear in 1, whereas four‐coordinated distorted tetrahedron in 2 . The electrochemical sensing performance of Ag(I) complexes modified carbon paste electrode (CPE‐1 and CPE‐2) toward hydrogen peroxide (H2 O2 ) was evaluated by chronoamperometry in 0.2 M phosphate buffer saline (pH = 6) at −0.2 V. The CPE‐1 was found to have a wide linear response from 1.0 × 10 −5 to 4.0 × 10 −3 M, lower detection limit of 1.73 μM, excellent anti‐interference ability, and stability. The CPE‐2 does not have recognition properties for H2 O2, which may be due to the large steric hindrance around Ag(I) centers that is not easy to combine with H2 O2 to form a catalytic transition state. The above studies proved that Ag(I) complexes can be used as effective components of electrode materials for the electrochemical recognition of H2 O2 . Abstract : Two new Ag(I) complexes were synthesized and characterized. Their Ag(I) centers displayed different coordination geometric structures: two‐coordinated linear in 1, whereas four‐coordinated distorted tetrahedron in 2 . The electrochemical sensing performance of Ag(I) complexe‐modified carbon paste electrode (CPE‐1 and CPE‐2) toward H2 O2 was evaluated by chronoamperometry in 0.2 M phosphate buffer saline (pH = 6) at −0.2 V. The CPE‐1 was found to have a wide linear response from 1.0 × 10 −5 to 4.0 × 10 −3 M, lower detection limit of 1.73 μM, excellent anti‐interference ability, and stability. The CPE‐2 does not have recognition properties for H2 O2, which may be due to the large steric hindrance around Ag(I) centers that is not easy to combine with hydrogen peroxide to form a catalytic transition state. The results reveal that the Ag(I) complexes may be used as effective components of electrode materials.