Jump to main content
Jump to site search


Synthesis and characterization of the immobilized Ni–Zn–Fe layered double hydroxide (LDH) on silica-coated magnetite as a mesoporous and magnetically reusable catalyst for the preparation of benzylidenemalononitriles and bisdimedones (tetraketones) under green conditions

Author affiliations

Abstract

Herein, novel magnetic Fe3O4@SiO2@Ni–Zn–Fe layered double hydroxide (LDH) intercalated with water molecules and carbonate anions as interlayer contents was prepared as a new heterogeneous and separable nanocatalyst. The mesoporous catalyst was characterized using Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), Brunauer–Emmett–Teller (BET) technique, vibration sample magnetometry (VSM), thermogravimetric analysis (TGA), differential thermal gravity (DTG), and transmission electron microscopy (TEM). The Knoevenagel and tandem Knoevenagel–Michael reactions were carried out between aromatic aldehydes, malononitrile, and dimedone using the magnetically reusable nanocatalyst in water as a green and eco-friendly solvent to afford benzylidenemalononitrile and bisdimedone derivatives (tetraketones), respectively. The reusability and recoverability of the core–shell hydrotalcite was examined six times without any significant loss of its catalytic activity. This magnetic LDH catalyst provides high yields, mild reaction conditions, satisfactory reaction times, and high purity of the obtained products without utilizing any hazardous organic solvents during the titled transformations.

Graphical abstract: Synthesis and characterization of the immobilized Ni–Zn–Fe layered double hydroxide (LDH) on silica-coated magnetite as a mesoporous and magnetically reusable catalyst for the preparation of benzylidenemalononitriles and bisdimedones (tetraketones) under green conditions

Back to tab navigation

Supplementary files

Publication details

The article was received on 15 Feb 2018, accepted on 06 Apr 2018 and first published on 06 Apr 2018


Article type: Paper
DOI: 10.1039/C8NJ00788H
Citation: New J. Chem., 2018, Advance Article
  •   Request permissions

    Synthesis and characterization of the immobilized Ni–Zn–Fe layered double hydroxide (LDH) on silica-coated magnetite as a mesoporous and magnetically reusable catalyst for the preparation of benzylidenemalononitriles and bisdimedones (tetraketones) under green conditions

    M. Gilanizadeh and B. Zeynizadeh, New J. Chem., 2018, Advance Article , DOI: 10.1039/C8NJ00788H

Search articles by author

Spotlight

Advertisements