Catalysis of alkene epoxidation by manganese(II) and (III) complexes of both Schiff base and reduced Schiff base ligands utilizing environmentally benign H2O2

Polyhedron ◽  
2018 ◽  
Vol 144 ◽  
pp. 198-209 ◽  
Author(s):  
Rita Egekenze ◽  
Yilma Gultneh ◽  
Ray Butcher
Keyword(s):  
Schiff Base ◽  
Environmentally Benign ◽  
Schiff Base Ligands ◽  
Reduced Schiff Base ◽  
Reduced Schiff Base Ligands

scholarly journals Ni(II) Dimers of NNO Donor Tridentate Reduced Schiff Base Ligands as Alkali Metal Ion Capturing Agents: Syntheses, Crystal Structures and Magnetic Properties

2018 ◽  
Vol 4 (4) ◽  
pp. 51 ◽  
Author(s):  
Monotosh Mondal ◽  
Maharudra Chakraborty ◽  
Michael G. B. Drew ◽  
Ashutosh Ghosh
Keyword(s):  
Schiff Base ◽  
Metal Ion ◽  
Magnetic Measurements ◽  
Dft Method ◽  
Distorted Octahedral Geometry ◽  
Schiff Base Ligands ◽  
Reduced Schiff Base ◽  
Ferromagnetic Interactions ◽  
Experimental Values ◽  
Reduced Schiff Base Ligands

Three trinuclear Ni(II)-Na(I) complexes,[Ni2(L1)2NaCl3(H2O)]·H2O (1), [Ni2(L2)2NaCl3(H2O)] (2), and [Ni2(L3)2NaCl3(OC4H10)] (3) have been synthesized using three different NNO donor tridentate reduced Schiff base ligands, HL1= 2-[(3-methylamino-propylamino)-methyl]-phenol, HL2= 2-[(3-methylamino-propylamino)-methyl]-4-chloro-phenol, and HL3= 2-[(3-methylamino-propylamino)-methyl]-6-methoxy-phenol that had been structurally characterized. Among these complexes, 1 and 2 are isostructural in which dinuclearNi(II) units act as metalloligands to bind Na(I) ions via phenoxido and chlorido bridges. The Na(I) atom is five-coordinated, and the Ni(II) atom possesses hexacordinated distorted octahedral geometry. In contrast, in complex 3, two -OMe groups from the dinuclear Ni(II) unit also coordinate to Na(I) to make its geometry heptacordinated pentagonal bipyramidal. The magnetic measurements of complexes 1–3 indicate ferromagnetic interactions between dimeric Ni(II) units with J = 3.97 cm−1, 4.66 cm−1, and 5.50 cm−1for 1–3, respectively, as is expected from their low phenoxido bridging angles (89.32°, 89.39°, and 87.32° for 1–3, respectively). The J values have been calculated by broken symmetry DFT method and found to be in good agreement with the experimental values.

Synthesis and antiradical activity of novel copper(II) complexes of long chain reduced Schiff base ligands

2018 ◽  
Vol 149 (5) ◽  
pp. 901-911 ◽  
Author(s):  
Lucia Lintnerová ◽  
Jindra Valentová ◽  
Peter Herich ◽  
Jozef Kožíšek ◽  
Ferdinand Devínsky
Keyword(s):  
Schiff Base ◽  
Antiradical Activity ◽  
Schiff Base Ligands ◽  
Reduced Schiff Base ◽  
Reduced Schiff Base Ligands ◽  
Long Chain

scholarly journals Heterometallic Complexes Containing the NiII-LnIII-NiII Moiety—Structures and Magnetic Properties

Crystals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1117
Author(s):  
Catherine P. Raptopoulou
Keyword(s):  
Magnetic Properties ◽  
Schiff Base ◽  
Structural Characteristics ◽  
Structural Similarity ◽  
Heterometallic Complexes ◽  
Schiff Base Ligands ◽  
Lanthanide Ion ◽  
Trinuclear Complexes ◽  
Reduced Schiff Base ◽  
Reduced Schiff Base Ligands

This review summarizes the structural characteristics and magnetic properties of trinuclear complexes containing the NiII-LnIII-NiII moiety and also oligonuclear complexes and coordination polymers containing the same trinuclear moiety. The ligands used are mainly polydentate Schiff base ligands and reduced Schiff base ligands and, in some cases, oximato, β-diketonato, pyridyl ketone ligands and others. The compounds reported are restricted to those containing one, two and three oxygen atoms as bridges between the metal ions; examples of carboxylato and oximato bridging are also included due to structural similarity. The magnetic properties of the complexes range from ferro- to antiferromagnetic depending on the nature of the lanthanide ion.

Sign in / Sign up

Export Citation Format

Share Document