Immobilization of Chlorosulfonyl-Calix[4]arene onto the surface of silica gel through the directly estrification

Taghvaei-Ganjali, Saeed; Zadmard, Reza; Saber-Tehrani, Mandana

doi:10.1016/j.apsusc.2011.09.019

Cited by 24 publications

(10 citation statements)

References 60 publications

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“…The peak around 2θ = 20-25° was assigned to the hexagonal structure of silica gel. 30 On the other hand, XRD patterns of the Fe/SiO 2 catalysts prepared using yerba mate tea extract (Figure 1b) lack well defined peaks related to crystalline iron compounds. The non-supported YM Fe presented large peaks around 25 and 43°, which was also observed in the supported catalysts and could be due to iron materials of very poor crystallinity or to organic matter.…”

Section: Resultsmentioning

confidence: 99%

Yerba Mate Tea Extract: a Green Approach for the Synthesis of Silica Supported Iron Nanoparticles for Dye Degradation

Trotte¹,

Aben-Athar²,

Carvalho³

2016

Journal of the Brazilian Chemical Society

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This work describes a green approach to the synthesis of iron nanoparticles supported in silica using tea extract of the South American plant yerba mate (Ilex paraguariensis). Catalysts with different iron contents were obtained according to the reaction conditions employed. Characterization by X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) revealed the amorphous nature of the nanoparticles, tentatively ascribed to iron(II)/iron(III) oxide composites, as Fourier transform infrared (FTIR) and thermogravimetric analyses confirmed their functionalization by the tea polyphenolic compounds. For the sake of comparison, crystalline zero-valent iron nanoparticles were prepared by the classical method using NaBH 4 . Both materials were tested in the degradation of methyl orange and led to complete decolourization; the green nanoparticles were very active as heterogeneous Fenton-like catalysts in presence of hydrogen peroxide, while the nanoparticles prepared with NaBH 4 were efficient in the reductive degradation of the dye.

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Section: Resultsmentioning

confidence: 99%

Yerba Mate Tea Extract: a Green Approach for the Synthesis of Silica Supported Iron Nanoparticles for Dye Degradation

Trotte¹,

Aben-Athar²,

Carvalho³

2016

Journal of the Brazilian Chemical Society

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“…Such functionalized calixarenes form complexes with metal cations, substituted ammonium ions, and even neutral molecules like acetone, toluene, etc. [4][5][6][7]. Addition of calixarene to some polymers like polyurethane can result in many significant structural changes which consequently reflect the mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…The synthesis of calixarene derivatives and using them as a precursor to react with polyurethane in order to form calixarene-polyurethane composite and their application in ionic complexes and biomolecules have been widely investigated [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…It has been established that the phenolic hydroxy groups appended on the lower rim form strong intermolecular hydrogen bonds, serving as the main driving force for the stabilization of the 'cone' conformation [1][2][3][4]. They are a class of host compounds that combine a polar and an apolar molecular region, both capable of interacting with a variety of guest molecules [4][5][6][7]. The synthesis and purification of functionalized calixarenes have been optimized very successfully, which makes them a very promising class of synthetic host molecules, particularly when selective chemical transformations convert the parent compound into highly organized host molecules, e.g., calixcrowns, calix-spherands etc.…”

Section: Introductionmentioning

confidence: 99%

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Application of sulfonamide derivative of calixarene for improvement of mechanical properties and thermal stability of polyurethane composite

Taghvaei-Ganjali

Rasouli-Saniabadi

Mirmoeini

2015

J Incl Phenom Macrocycl Chem

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A calixarene derivative, 5,11,17,23-tetrakis (hydroxyl ethyl sulfonamide) calix [4]arene, was synthesized through a linear reaction from parent calix [4]arene. This sulfonamide calixarene derivative was used as a precursor to produce calixarene-polyurethane composite. Structural properties of calixarene-based synthesized precursors were studied using spectroscopic techniques such as 1 H-NMR, 13 C-NMR, and IR. Also, mechanical properties of produced polyurethane composite such as fracture elongation, modulus, and tensile strength were studied which indicated that these properties were deeply dependent upon calixarene ratio in composite. An increase in calixarene ratio resulted in a decrease the fracture elongation. In contrast, an increase in calixarene ratio caused a considerable decrease of modulus and tensile strength. The modulus and tensile strength were increased by 16.98 and 20 % as the calixarene/polyol ratio reached 3 %. Finally, TGA and DSC studies showed that calixarene ratio considerably enhanced the thermal stability of polyurethane.

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“…From structural viewpoint, a calixarene is a flexible type of macrocyclic system having soft π‐donor cavities consisting of phenyl groups along with hard oxygen cavities located on the hydroxyl lower rim. It is noticeably gaining importance in the field of host‐guest chemistry as a result of complex formation with ions and even nonionic species …”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Functionalized Calix[4]arene Derivatives and Preparation of Rigid Polyurethane Foams by the Incorporation of Calixarene

Mirmoeini

Nikje

Rasouli-Saniabadi

et al. 2017

Macromolecular Symposia

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Summary Calix[4]arenes namely, 5,11,17,23 tetra tert butyl calix[4]arene and 5,11,17,23 tetra chlorosulfonyl calix[4]arene were synthesized to produce octakis (hydroxyl ethyl) sulfonamide calix[4]arene which was used in polyurethane‐calixarene rigid foam composite formulation. The effect of calixarene ratio on mechanical properties of synthesized composites was studied at three calixarene ratios including 1.5, 2, and 3 % (w/w). The obtained data indicate that the tensile strength and modulus are increased as the calixarene ratio increases while the fracture strain is decreased. Quantitatively, addition of 3% (w/w) of calixarene to the polyurethane resulted in 30.99% and 30.01% improvements in modulus and tensile strength, respectively. Contrarily, a decrease of about 13.1% was observed in fracture strain when compared to the properties of the pristine polyurethane rigid foam. The effect of Calixarene on thermal stability of Calixarene‐ polyurethane composite indicating that Calixarene component strictly enhances the thermal stability of composite.

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Immobilization of Chlorosulfonyl-Calix[4]arene onto the surface of silica gel through the directly estrification

Cited by 24 publications

References 60 publications

Yerba Mate Tea Extract: a Green Approach for the Synthesis of Silica Supported Iron Nanoparticles for Dye Degradation

Yerba Mate Tea Extract: a Green Approach for the Synthesis of Silica Supported Iron Nanoparticles for Dye Degradation

Application of sulfonamide derivative of calixarene for improvement of mechanical properties and thermal stability of polyurethane composite

Synthesis and Characterization of Functionalized Calix[4]arene Derivatives and Preparation of Rigid Polyurethane Foams by the Incorporation of Calixarene

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