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γ-Fe 2 O 3  was used to prepare γ-Fe 2 O 3 @SiO 2 , γ-Fe 2 O 3 @SiO 2 -NH 2  and γ-Fe 2 O 3 @SiO 2 -NH 2 -COOH nanoparticles. Core-shell modification of IRMOF3 was used to obtain γ-Fe 2 O 3 @SiO 2 -NH 2 -COOH/IRMOF3 nanoparticles. γ-Fe 2 O 3 @SiO 2 -NH 2 -COOH/IRMOF3 nanoparticles were modified by activated arginine (Arg), glycine (Gly) and lysine (Lys) to synthesize γ-Fe 2 O 3 @SiO 2 -NH 2 -COOH/IRMOF3-Arg, γ-Fe 2 O 3 @SiO 2 -NH 2 -COOH/IRMOF3-Gly and γ-Fe 2 O 3 @SiO 2 -NH 2 -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-Fe 2 O 3 @SiO 2 -NH 2 -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- d6 ) spectra showed γ-Fe 2 O 3 @SiO 2 -NH 2 -COOH/IRMOF3-Gly nanoparticles to be more active.

Core-shell magnetic microspheres as heterogeneous catalyst for synthesis of benzimidazole