Palladium Schiff-base complex loaded SBA-15 as a novel nanocatalyst for the synthesis of 2,3-disubstituted quinoxalines and pyridopyrazine derivatives

Bardajee, Ghasem Rezanejade; Malakooti, Reihaneh; Abtin, Ibrahim; Atashin, Hassan

doi:10.1016/j.micromeso.2012.10.020

Cited by 43 publications

(22 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1b. Both images confirm the ordered channel structure of nanoporous SBA-15 and Schiff-base/SBA-15 nanoadsorbent which are in good agreement with XRD data (Cheraghali et al 2013;Bardajee et al 2013). The pore size of SBA-15 is about 3.3 nm, but the pore size of Schiff-base/SBA-15 nanoadsorbent is about 1.5 nm.…”

Section: Resultssupporting

confidence: 86%

“…The broad band at around 1,614 cm -1 is the characteristic of the C=N stretching bands. In addition, the strong peak for stretching of Si-O-Si and the bending vibration of Si-O-Si can be detected at 1,100 and 800 cm -1 , respectively (Bardajee et al 2013). The N 2 adsorption-desorption isotherms of the pure SBA-15 and Schiff-base/SBA-15 nanoadsorbent are shown in Fig.…”

Section: Resultsmentioning

confidence: 93%

“…However, the peak intensity, especially for the (100), decreases significantly. This is probably due to the shrinking of the lattice as a result of condensation (Bardajee et al 2013). TEM images of the pure SBA-15 and Schiff-base/SBA-15 nanoadsorbent are shown in and Schiff-base/SBA-15 nanoadsorbent, e N 2 adsorption-desorption isotherms with pore size distributions at inset of the pure SBA-15 and Schiff-base/SBA-15 nanoadsorbent Fig.…”

Section: Resultsmentioning

confidence: 98%

“…These peaks indicate an ordered hexagonal nanoporous materials with high symmetry (Cheraghali et al 2013;Bardajee et al 2013). The Schiff-base/SBA-15 nanoadsorbent has an intensive (100) reflection, indicating the presence of ordered hexagonal structure similar to pure SBA-15.…”

Section: Resultsmentioning

confidence: 99%

“…In the second method, the ordered mesoporous skeleton is first obtained, and the desired silane is added to the suspension in a second step to result in the final functional solid (Tang et al 2011;Hernández-Morales et al 2012;Li et al 2014). Recently, Bardajee et al (2013) reported the use of SBA-15 containing a Schiff-base ligand as a catalyst for the synthesis of 2, 3-disubstituted quinoxalines and pyridopyrazine derivatives.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Synthesis and characterization of a novel Schiff-base/SBA-15 nanoadsorbent for removal of methylene blue from aqueous solutions

Bardajee

Hooshyar

Shahidi

2014

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

A novel Schiff-base/SBA-15 nanoadsorbent was successfully synthesized by the reaction of salicylaldehyde and (3-aminopropyl) trimethoxysilane in methanol and subsequent grafting with SBA-15. The morphology and structures of the as-synthesized Schiff-base/SBA-15 nanoadsorbent were characterized by powder X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, thermo-gravimetric analysis, and N 2 adsorption/desorption isotherms. The obtained Schiff-base/SBA-15 nanoadsorbent was used for the removal of methylene blue (MB) from aqueous solutions. The effects of various parameters such as temperature, concentration, pH, and contact time were examined, and optimal experimental conditions were determined. The equilibrium isotherms were conducted using Freundlich and Langmuir models. The pseudo-first-order, pseudosecond-order, and intraparticle diffusion models were used to fit adsorption data in the kinetic studies. The thermodynamic parameters such as the standard enthalpy, standard entropy, and standard free energy were evaluated. The obtained results indicated that the Schiff-base/SBA-15 nanoadsorbent is an efficient adsorbent for removing MB.

show abstract

Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Synthesis and characterization of a novel Schiff-base/SBA-15 nanoadsorbent for removal of methylene blue from aqueous solutions

Bardajee

Hooshyar

Shahidi

2014

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

Copper(II)–diaminosarcophagine‐functionalized SBA‐15: a heterogeneous nanocatalyst for the synthesis of benzimidazole, benzoxazole and benzothiazole derivatives under solvent‐free conditions

Bardajee

Mohammadi

Kakavand

2015

Applied Organom Chemis

View full text Add to dashboard Cite

Solvent‐free organic reactions were studied over periodic mesoporous silica (SBA‐15) containing a Cu(II) organometallic complex. This heterogeneous catalyst was achieved by coordination of Cu(II) ions with the diaminosarcophagine ligand and then its grafting onto the surface of SBA‐15. This catalyst displayed ordered mesoporous channels, which implies an extremely high dispersion of the Cu(II) complex and the convenient diffusion of reactant molecules into the pore channels. Therefore, this catalyst can offer high activity and also facile separation or recycling when compared with its homogeneous counterparts. Copyright © 2015 John Wiley & Sons, Ltd.

show abstract

Palladium nanoparticles immobilized on Schiff base‐functionalized mesoporous silica as a highly efficient and magnetically recoverable nanocatalyst for Heck coupling reaction

Khodaei

Dehghan

2018

Applied Organom Chemis

View full text Add to dashboard Cite

A new magnetically recoverable nanocatalyst was prepared by functionalization of mesoporous silica (SBA-15) with a Schiff base ligand, and then immobilization of palladium nanoparticles on it using a simple procedure. This heterogeneous catalyst was fully characterized using appropriate analyses and its catalytic efficiency was investigated in Heck reaction using iodo-, bromo-and chlorobenzene derivatives and styrene, with the aim of synthesizing stilbene derivatives, a class of compounds with a variety of pharmacological properties. Some of the characteristics of this nanocatalyst include good dispersion of palladium nanoparticles on the SBA-15 support, easy separation, catalyses the production of stilbene derivatives in a short time with excellent yields even for bromo-and chlorobenzene, and preservation of its catalytic activity after eight reaction cycles.

show abstract

Palladium Schiff-base complex loaded SBA-15 as a novel nanocatalyst for the synthesis of 2,3-disubstituted quinoxalines and pyridopyrazine derivatives

Cited by 43 publications

References 56 publications

Synthesis and characterization of a novel Schiff-base/SBA-15 nanoadsorbent for removal of methylene blue from aqueous solutions

Synthesis and characterization of a novel Schiff-base/SBA-15 nanoadsorbent for removal of methylene blue from aqueous solutions

Copper(II)–diaminosarcophagine‐functionalized SBA‐15: a heterogeneous nanocatalyst for the synthesis of benzimidazole, benzoxazole and benzothiazole derivatives under solvent‐free conditions

Palladium nanoparticles immobilized on Schiff base‐functionalized mesoporous silica as a highly efficient and magnetically recoverable nanocatalyst for Heck coupling reaction

Contact Info

Product

Resources

About