Preparation of Immobilized Chromium Schiff Base Complexes and their Catalytic Performance for Olefins Epoxidation

2014 ◽  
Vol 692 ◽  
pp. 240-244
Author(s):  
Gong De Wu ◽  
Xiao Li Wang ◽  
Zhi Li Zhai
Keyword(s):  
Hydrogen Peroxide ◽  
Schiff Base ◽  
Elemental Analysis ◽  
Catalytic Performance ◽  
Schiff Base Complexes ◽  
Metal Centers ◽  
Chemical Measurements ◽  
Physico Chemical ◽  
Immobilized Complexes ◽  
Mcm 41

A series of transition metal alanine-salicylaldehyde Schiff base chromium (III) complexes immobilized on MCM-41 were prepared and characterized by various physico-chemical measurements such as FIIR, XRD, HRTEM, N2 sorption and elemental analysis. The immobilized complexes were effective and stable catalysts for the epoxidation of styrene and cyclohexene with 30% hydrogen peroxide. Moreover, the metal centers were found to play important roles in the catalytic performance of immobilized complex catalysts.

Mediated Improvement in Catalytic Performance of MCM-41 Immobilized Chromium Schiff Base Complex for Solvent-Free Oxidation of Cyclohexanol

2012 ◽  
Vol 550-553 ◽  
pp. 200-204
Author(s):  
Xiao Li Wang ◽  
Gong De Wu ◽  
Fang Wang
Keyword(s):  
Schiff Base ◽  
Schiff Base Complex ◽  
Catalytic Performance ◽  
Schiff Base Complexes ◽  
Dispersion Effect ◽  
Effect Of The Support ◽  
Immobilized Complexes ◽  
Free Oxidation ◽  
Linker Flexibility ◽  
Mcm 41

A series of chromium (III) Schiff base complexes immobilized on MCM-41 were prepared and used for the selective oxidation of cyclohexanol with 30% hydrogen peroxide. The results revealed that the immobilized complexes were active catalysts and exhibited much higher catalytic performance than their homogeneous analogue. This could be ascribed to the dispersion effect of the support. Simultaneously, the linker flexibility and the surface property of support were also found to play important roles in the catalytic performance of immobilized complexes.

scholarly journals Amalgamation of Novel Schiff Base Ligand and Its Transition Metal Complexes and Their Biological Activity

2019 ◽  
pp. 1-13
Author(s):  
B. Akila ◽  
A. Xavier
Keyword(s):  
Antibacterial Activity ◽  
Schiff Base ◽  
Metal Complexes ◽  
Elemental Analysis ◽  
Schiff Base Ligand ◽  
Electronic Spectroscopy ◽  
Antioxidant Properties ◽  
Salmonella Typhi ◽  
Metal Chelates ◽  
Schiff Base Complexes

Schiff base synthesized from 2-hydroxy-1-naphthaldehyde and 2-2’ (ethylene dioxy) bis ethylenediamine (L1) and its Metal complexes, [M (II) (L)6](where M= Mn(II), Ru(III), Cu(II)and V(V) L= Schiff base moiety), have been prepared and characterized by elemental analysis, spectroscopic measurements (infrared, electronic spectroscopy, 1H-NMR, EPR and Mass spectroscopy ). Elemental analysis of the metal complexes was suggested that the stoichiometry ratio is 1:1 (metal-ligand). The electronic spectra suggest an octahedral geometry for MC1and MC2 Schiff base complexes and distorted octahedral for MC3 and MC4 complexes. The Schiff base and its metal chelates have been screened for their invitro test antibacterial activity against three bacteria, gram-positive (Staphylococcus aureus) and gram-negative (Klebsiella pheneuammonia and Salmonella typhi). Two strains of fungus (Aspergillus niger and Candida albicans). The metal chelates were shown to possess more anti fungal activity compare then antibacterial activity and antioxidant properties. The complexes are highly active than the free Schiff-base ligand.    

Manganese Schiff Base Immobilized on Graphene Oxide Complex and Its Catalysis for Epoxidation of Styrene

2021 ◽  
Vol 43 (1) ◽  
pp. 57-57
Author(s):  
Shuisheng Wu Shuisheng Wu ◽  
Donghui Lan Donghui Lan ◽  
Nianyuan Tan Nianyuan Tan ◽  
Ran Wang Ran Wang ◽  
Chak Tong Au Chak Tong Au ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Schiff Base ◽  
Graphene Oxide ◽  
Catalytic Performance ◽  
Covalent Modification ◽  
Styrene Epoxidation ◽  
Solid Supports ◽  
Structures And Properties ◽  
Ft Ir ◽  
Coordination Reaction

Immobilization of metal complexes on solid supports is an efficient approach to circumvent the drawbacks of homogeneous catalysis. In this paper, using graphene oxide as carrier, manganese Schiff base supported on graphene oxide (Salen Mn-GO) was prepared through aminosilane covalent modification as well as salicylaldehyde condensation and coordination reaction. The structures and properties of the composite were examined by FT-IR, XRD, XPS, TEM, TG techniques, and the catalytic performance of Salen Mn-GO in styrene epoxidation was explored. The effects of catalyst and styrene amount as well as that of reaction time on the performance of the catalyst were investigated. The results showed that Salen Mn-GO has excellent catalytic activity and reusability for epoxidation of styrene in the presence of hydrogen peroxide. Finally, the mechanism of styrene epoxidation catalyzed by Salen Mn-GO has been preliminarily discussed.

Synthesis and Characterisation of Macrocyclic Copper(II) Complexes Containing N3O4 Donor Sets

2008 ◽  
Vol 2008 (10) ◽  
pp. 587-588 ◽  
Author(s):  
Hassan Keypour ◽  
Ahmad Ali Dehghani-Firouzabadi ◽  
Maryam Shayesteh ◽  
Sadegh Salehzadeh
Keyword(s):  
Schiff Base ◽  
Mass Spectroscopy ◽  
Elemental Analysis ◽  
Schiff Base Complexes ◽  
Macrocyclic Schiff Base ◽  
Formation Of Complexes ◽  
Template Reaction

Two new macrocyclic Schiff-base complexes of Cu(II) have been prepared by the template reaction of 2,6-bis (2-formylphenoxymethyl)pyridine with 1,2-bis(2′-aminophenoxy)benzene [L1] or with 1,2-bis(2′-aminophenoxy)-4-tert-butylbenzene [L2] in the presence of Cu(II) perchlorate. The amines used have low flexibility and therefore the formation of complexes was very difficult. The synthesised 23-membered, heptadentate N3O4 complexes were characterised by elemental analysis, IR, and FAB-mass spectroscopy.

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