Core-shell magnetic microspheres as heterogeneous catalyst for synthesis of benzimidazole. Issue 1 (17th January 2022)

• Record Type: Journal Article
• Authors: Yang, Linyan; Chen, Lan; Guo, Jinwei; Li, Cun; Jin, Tianming
• Is Part Of: Journal of coordination chemistry. Volume 75:Issue 1/2(2022)
• Page Start: 280
• Page End: 292
• Publication Date: 2022-01-17
• Subjects: γ-Fe2O3 -- core-shell -- condensation reaction -- catalytic activity; Coordination compounds -- Periodicals; 541.2242
• DOI: 10.1080/00958972.2022.2041606
• Languages: English
• ISSNs: 0095-8972

Abstract

Abstract: γ-Fe2 O3 was used to prepare γ-Fe2 O3 @SiO2, γ-Fe2 O3 @SiO2 -NH2 and γ-Fe2 O3 @SiO2 -NH2 -COOH nanoparticles. Core-shell modification of IRMOF3 was used to obtain γ-Fe2 O3 @SiO2 -NH2 -COOH/IRMOF3 nanoparticles. γ-Fe2 O3 @SiO2 -NH2 -COOH/IRMOF3 nanoparticles were modified by activated arginine (Arg), glycine (Gly) and lysine (Lys) to synthesize γ-Fe2 O3 @SiO2 -NH2 -COOH/IRMOF3-Arg, γ-Fe2 O3 @SiO2 -NH2 -COOH/IRMOF3-Gly and γ-Fe2 O3 @SiO2 -NH2 -COOH/IRMOF3-Lys nanoparticles. The products were used as catalysts for condensation reactions of benzaldehyde and o -phenylenediamine. Infrared spectroscopy (IR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) spectra were used for the characterization. γ-Fe2 O3 @SiO2 -NH2 -COOH/IRMOF3-Gly nanoparticles showed outstanding catalytic effects as determined by a fluorescence spectrophotometer. In RP-HPLC spectra, the retention time of the reaction products was 2.458 min and 3.392 min. The results of the 1 H NMR (400 MHz, MeOH- d 6 ) spectra showed γ-Fe2 O3 @SiO2 -NH2 -COOH/IRMOF3-Gly nanoparticles to be more active. GRAPHICAL ABSTRACT: UF0001