Synthesis of Fe 3 O 4 @SiO 2 @OSi(CH 2 ) 3 NHRN(CH 2 PPh 2 ) 2 PdCl 2 type nanocomposite complexes: Highly efficient and magnetically-recoverable catalysts in vitamin K 3 synthesis

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Nano Fe 3 O 4 particles were obtained in microvawe oven using closed system. Oxovanadium(IV) complexes of Fe 3 O 4 @SiO 2 @(aminomethylphosphine) type ligands were synthesized and characterized using SEM, EDX, TEM, UV-Visible, XRD, FT-IR and TG/DTA techniques. Catalytic properties of the synthesized pincer type oxovanadium(IV)-aminomethylphosphine complexes supported on magnetic nano structure were investigated in the synthesis of 2-methyl-1, 4-naphthoquinone (Vitamin K 3 , menadione, 2MNQ) from 2-methyl naphthalene (2MN) in hydrogen peroxide, acetic acid and sulfuric acid. Magnetic-nano particle supported oxovanadium(IV)-aminomethylphosphine type complexes were very efficient catalysts with the 51.36-55.20 % selectivities in conversions of 89.78-95.01 %. Besides, the hetergeneous complexes were very active in five cycling tests on avarage evaluated in the reusability.

Section: Introductionmentioning

confidence: 82%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…chromium containing waste is thrown away in the production of 1 kg vitamin K 3 . The treatment of the waste having chromium in the classical menadione production is quite difficult …”

Section: Introductionmentioning

confidence: 99%

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Synthesis of crab type Aminomethyldiphosphine‐Oxovanadium(IV) complexes supported on magnetic Nano particles: Selective and recoverable catalysts in vitamin K₃ synthesis

Uruş

Çaylar

Koçer

2018

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Synthesis and characterization of graphene oxide‐based hybrid ligand and its metal complexes: Highly efficient sensor and catalytic properties

Karabörk¹,

Zubair²,

Uruş³

et al. 2018

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A new graphene oxide‐based hybrid material (HL) and its Co(II), Cu(II) and Ni(II) metal complexes were prepared. Firstly, graphene oxide and (3‐aminopropyl)trimethoxysilane were reacted to give graphene oxide–3‐(aminopropyl)trimethoxysilane (GO‐APTMS) hybrid material. After that, hybrid material HL was synthesized from the reaction of GO‐APTMS and 2,6‐diformyl‐4‐methylphenol. Finally, Co(II), Cu(II) and Ni(II) complexes of HL were obtained. All the materials were characterized using various techniques. The chemosensor properties of HL were investigated against Na+, K+, Cd2+, Co2+, Cu2+, Hg2+, Ni2+, Zn2+, Al3+, Cr3+, Fe3+ and Mn3+ ions and it was found that HL has selective chemosensing to Fe3+ ion. All the graphene oxide‐supported complexes were used as heterogeneous catalysts in the oxidation of 2‐methylnaphthalene (2MN) to 2‐methyl‐1,4‐naphthoquinone (vitamin K3, menadione) in the presence of hydrogen peroxide, acetic acid and sulfuric acid. The Cu(II) complex showed good catalytic properties compared to the literature. The selectivity of 2MN to vitamin K3 was 60.23% with 99.75% conversion using the Cu(II) complex.

Anchoring of Cu (II)‐Schiff base complex on magnetic mesoporous silica nanoparticles: catalytic efficacy in one‐pot synthesis of 5‐substituted‐1H‐tetrazoles, antibacterial activity evaluation and immobilization of α‐amylase

Ahmadi

Sedaghat

Motamedi

et al. 2020

Magnetic mesoporous silica nanocomposite, Fe3O4@MCM‐41, was prepared and functionalized with N‐(2‐aminoethyl)‐3‐aminopropyltrimethoxysilane (AEAPS). Then Schiff base grafted nanoparticles were synthesized by the condensation of 5,5'‐methylene bis (salicylaldehyde) and then benzhydrazide with Fe3O4@MCM‐41‐AEAPS. Finally, by adding Cu (CH3COOH)2.H2O, the magnetic nanoparticles (MNPs) functionalized with Cu (II) Schiff base complex were synthesized. The new organic–inorganic hybrid nanocomposite was characterized by FT‐IR, PXRD, AAS, BET, TGA, VSM, FE‐SEM, HRTEM and EDX techniques. Then, the performance of this copper based magnetic nanocatalyst was investigated for the synthesis of 5‐substituted 1H‐tetrazole derivatives using one pot three‐component reactions of various aldehydes, hydroxyl amine hydrochloride and sodium azide. The catalyst can be easily isolated from the reaction mixture by applying an external magnet and reused for at least 5 times without significant loss in catalytic activity. Also, the antibacterial activity of the streptomycin loaded magnetic nanoparticles against Gram‐positive (S. aureus) and Gram‐negative (E. coli) bacteria in the presence and absence of a magnetic field were studied. Results revealed that when these materials exposed to the magnetic field, bacteriostatic activity of nanocomposites was increased. Furthermore, the enzyme immobilization ability of the synthesized compounds was investigated and the results showed that these nanoparticles efficiently immobilized amylase enzyme.