597 spectrophotometer

The materials used here
including FeSO₄·7H₂O, FeCl₃,
aqueous ammonia (25%), acetone, ethanol, tetraethyl orthosilicate,
GPTMS, various aromatic aldehydes, toluene (anhydrous), various phenoles,
ethylenediamine, malononitrile, salicylaldehyde, and Cu(NO₃)₂·3H₂O were prepared from the Merck or
Fluka (Switzerland) Company. ¹H NMR (250 MHz) and ¹³C NMR (62.5 MHz) spectra using dimethyl sulfoxide (DMSO-d₆) were acquired on a Bruker DRX-250 AVANCE
spectrometer. FT-IR analysis was fulfiled by a Perkin–Elmer
597 spectrophotometer. SEM analysis was recorded by a TE-SCAN, Brno
Czech Republic. TEM analysis was recorded on a Zeiss EM10C operating
at 80 kV TEM. The VSM analysis was utilized to specify the magnetic
trait of the Schiff base complex of copper coated on epoxy-modified
Fe₃O₄@SiO₂ MNPs (VSM, Taban, Tehran,
Iran). Also, XRD analysis (X’Pert-PRO advanced difractometer
operated at 40 kV and 40 mA at r.t.) helped to investigate the crystalline
structure of the catalyst. The EDAX spectrum was utilized for the
elemental analysis of the Schiff base complex of copper coated on
epoxy-modified Fe₃O₄@SiO₂ MNPs.^{52 (link)−55 (link)}

All of the used materials were purchased from Fluka (Switzerland), Sigma-Aldrich, and Merck (Germany): iron(iii) chloride, 25% ammonia, FeSO₄·7H₂O, (3-aminopropyl)triethoxysilane, ethanol, tetraethyl orthosilicate, cyanuric chloride, tetrahydrofuran, 2-picolylamine, NiCl₂·6H₂O, malononitrile, various aromatic aldehydes, and thiophenol. ¹H and ¹³C NMR spectra were obtained applying CDCl₃ or DMSO-d₆ solvent on a Bruker DRX-250 AVANCE spectrometer (at 250 and 62.5 MHz). FT-IR spectra were acquired by employing a PerkinElmer 597 spectrophotometer. The EDAX spectra were applied for the elemental analysis of Ni^II-picolylamine/TCT/APTES@SiO₂@Fe₃O₄. PXRD analysis was performed on an X'Pert-PRO advanced diffractometer operated at 40 kV and 40 mA at r.t to investigate the crystalline structure of the synthesized catalyst. The surface atomic concentration and chemical composition of Ni^II-picolylamine/TCT/APTES@SiO₂@Fe₃O₄ were investigated using XPS at an energy of 1253.6 eV (Esfahan University, Esfahan, Iran). SEM analysis was recorded on a TE-SCAN system (Brno, Czech Republic). TEM images were recorded using a Zeiss EM10C microscope operating at 80 kV. VSM analysis was applied to verify the magnetic properties of Ni^II-picolylamine/TCT/APTES@SiO₂@Fe₃O₄ (VSM, Taban, Tehran, Iran).

All materials
containing
iron (III) chloride, FeSO₄·7H₂O, aqueous
ammonia (25%), ethanol, GPTMS, toluene (anhydrous), hydrazine hydrate,
chlorosulfuric acid, benzaldehyde derivatives, dimedone, malononitrile,
diethyl acetylenedicarboxylate, and aniline were provided from Fluka,
Sigma-Aldrich, and Merck companies. FT-IR analyses were performed
on a Perkin-Elmer 597 spectrophotometer. ¹H and ¹³C NMR spectra were acquired on a Bruker DRX-250 AVANCE spectrometer
at 250 and 62.90 MHz, respectively. The crystallinity of the SO₃H/NH₂NH₂/GPTMS/Fe₃O₄ catalyst was surveyed using PXRD analysis (an X’Pert-Pro
advanced diffractometer operated at 40 kV and 40 mA at 25 °C).
EDAX was applied for elemental analysis of SO₃H/NH₂NH₂/GPTMS/Fe₃O₄ and achieved
by applying an EDAX detector. SEM analysis was performed with a TE-SCAN
(Brno, Czech Republic). Transmission electron microscopy (TEM) images
were recorded on a Zeiss EM10C microscope, operated at 80 kV.
VSM analysis was used to determine the magnetic properties of SO₃H/NH₂NH₂/GPTMS/Fe₃O₄ (VSM, Taban, Tehran, Iran).