Two binuclear silver(I) complexes containing V‐shaped bis (benzimidazole) ligands: Syntheses, structures, and electrochemical sensing toward hydrogen peroxide. (1st February 2022)

• Record Type: Journal Article
• Authors: Sun, Fugang; Dong, Jianping; Li, Ruixue; Jiang, Yuxuan; Wan, Tiantian; Wu, Huilu
• Is Part Of: Applied organometallic chemistry. Volume 36:Number 4(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-02-01
• Subjects: Ag(I) complex -- benzimidazole -- electrochemical sensor -- hydrogen peroxide -- structure; Organometallic chemistry -- Periodicals; Organometallic compounds -- Periodicals; 547.05
• DOI: 10.1002/aoc.6614
• Languages: English
• ISSNs: 0268-2605

Abstract

Abstract : Two new silver(I) complexes, formulated as [Ag2 L 1 2 (isophthalate)]·(C2 H5 OH)5 (1), [Ag2 L 2 2 (isophthalate)] (2) (L 1 = 1, 3‐bis[(N‐methyl‐benzimidazole)methylene]‐2‐aniline, L 2 = 1, 3‐bis[(N‐ethyl‐benzimidazole)methylene]‐2‐aniline), were synthesized by volatilization method and characterized by X‐ray crystallography, elemental analysis, IR and UV/Vis spectroscopy. The crystal analysis showed that although complexes 1 and 2 were both binuclear, their Ag(I) centers exhibited different coordination geometric structures: four‐coordinated distorted tetrahedron in complex 1, whereas three‐coordinated planar triangle in complex 2 . The electrochemical sensing performances of carbon paste electrode modified with Ag(I) complexes (CPE‐1 for complex 1 and CPE‐2 for complex 2 ) toward H2 O2 were evaluated by cyclic voltammogram and chronoamperometry in 0.2 M phosphate‐buffered saline (PBS, pH = 6.0) at −0.2 V. The results show that both CPE‐1 and CPE‐2 showed excellent electrocatalytic activity, quick response time (≤5 s) and high selectivity toward H2 O2 . The linear response range was from 5.0 × 10 −7 to 4.0 × 10 −3 M. The CPE‐1 exhibits better sensitivity and limit of detection (LOD) than CPE‐2, which is related to the coordination environment of Ag(I) ions. Sensors based on Ag(I) complexes have great application prospects in the field of electrochemical sensing. Abstract : Two new binuclear silver(I) complexes were synthesized and characterized. Their silver(I) centers exhibited different coordination geometric structures. The electrochemical sensing performances of carbon paste electrode modified with silver(I) complexes (CPE‐1 and CPE‐2) toward H2 O2 were studied. The results show that both CPE‐1 and CPE‐2 have excellent electrocatalytic activity, fast response time, wide detection range, high stability and selectivity for H2 O2 . The CPE‐1 exhibits better sensitivity and limit of detection than CPE‐2.