Fig. 3From: Preparation and application of FNAOSiPPEA/Cu(II) as a novel magnetite almondshell based Lewis acid-Bronsted base nano-catalyst for the synthesis of pyrimidobenzothiazolesFT-IR spectra of (a) Nano-almondshell (b) Fe3O4@nano-almondshell (c) FNAOSiPPEA (d) FNAOSiPPEA/Cu(II)Back to article page