Nano-[Fe 3 O 4 @SiO 2 / N -propyl-1-(thiophen-2-yl)ethanimine][ZnCl 2 ] as a nano magnetite Schiff base complex and heterogeneous catalyst for the synthesis of pyrimido[4,5- b ]quinolones.

Nano-[Fe 3 O 4 @SiO 2 / N -propyl-1-(thiophen-2-yl)ethanimine][ZnCl 2 ] as a nano magnetite Schiff base complex was designed and fully characterized by various analyses such as Fourier transform infrared spectroscopy (FT-IR), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), thermal gravimetric analysis (TGA), differential thermal gravimetric analysis (DTA), vibrating sample magnetometry (VSM), scanning electron microscopy (SEM), and transmission electron micrographs (TEM). The presented nano magnetite Schiff base complex was used as a heterogeneous catalyst for the synthesis of pyrimido[4,5- b ]quinolones by the reaction of aryl aldehyde, dimedone and 6-amino-1,3-dimethyluracil in EtOH : H 2 O (7 : 3) as a solvent at 60 °C.