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- Title
Preparation, characterization and catalytic activity of dendrimer-encapsulated phosphotungstic acid nanoparticles immobilized on nanosilica for the synthesis of 2 H-indazolo[2,1- b]phthalazine-triones under solvent-free or sonochemical conditions.
- Authors
Esmaeilpour, Mohsen; Javidi, Jaber; Dehghani, Farzaneh
- Abstract
In this paper, we adopt a facile method to prepare a type of porous silica nanoparticles ( n-SiO) from tetraethyl orthosilicate as the source of silica. Then, dendritic polymer supported on nanosilica with surface amino groups was fabricated. Finally, HPWO nanoparticles (PWA) were synthesized by the treatment of HPWO powder with n-Octane as solvent by a solvothermal method and then immobilized onto the dendrimer polymer functionalized nanosilica. The synthesized nanostructures were characterized by fourier transform infrared (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), dynamic light scattering (DLS), N adsorption-desorption isotherm analysis, UV-Vis and elemental analysis. The morphology of the catalyst was characterized using transmission electron microscopes (TEM). The acidity of the catalyst was determined by FTIR pyridine adsorption spectroscopy. Then, this catalytic system was used as an efficient catalyst for the synthesis of 2 H-indazolo[2,1- b]phthalazine-triones via multi-component and one-pot reactions of various aldehydes, phthalic anhydride, hydrazinium hydroxide, and dimedone under thermal solvent-free conditions or ultrasound irradiation at room temperature. Also, the catalyst can be easily recovered and reused for six consecutive reaction cycles without significant loss of activity.
- Subjects
POROUS silica; NANOPARTICLES; X-ray diffraction; ATMOSPHERIC temperature; PYRIDINE
- Publication
Journal of the Iranian Chemical Society, 2016, Vol 13, Issue 4, p695
- ISSN
1735-207X
- Publication type
Article
- DOI
10.1007/s13738-015-0782-x