A mononuclear nickel(II) complex and a dinuclear manganese(III) complex derived from N,N'-bis(5-methoxysalicylidene)-1,2-ethanediamine: Synthesis, crystal structures and catalytic epoxidation property

Wei, Fenyan

doi:10.1134/s1070328416010073

Cited by 3 publications

(3 citation statements)

References 24 publications

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“…A dinuclear Mn III ‐complex [Mn 2 L 2 (NCS) 2 ] with bis‐Schiff base ligand N , N ′‐bis(5‐methoxysalicylidene)‐1,2‐ethanediamine (H 2 L) conducted effective epoxidation of styrene using PhIO and NaOCl as the oxygen atom donors (Scheme 17). [37] The catalyst provided styrene epoxides with higher conversions and epoxide selectivity when PhIO was used as an oxidant as shown in the scheme.…”

Section: Mniii‐catalysed Epoxidationmentioning

confidence: 99%

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Recent Trends and Prospects in Homogeneous Manganese‐Catalysed Epoxidation

et al. 2021

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Epoxidation of alkenes is a significant reaction in organic chemistry due to its opportunities in producing compounds of biochemical interest. Catalytic epoxidation with first‐row transition elements has gained attention in the latest years wherein manganese based catalysts stand superior by satisfying numerous principles of green chemistry. In this review, we have summarized the recent developments in olefin epoxidation using homogeneous manganese catalysts. Manganese complexes with porphyrin, Schiff base, salen, and other non‐heme ligands made efficient catalytic systems during the last five years. Notably, we witnessed greener approaches in recent reports wherein photo‐catalysis is a promising strategy. We anticipate that the review will benefit the researchers to get a better understanding of the reaction and to choose the best catalysts for their reactions.

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Section: Mniii‐catalysed Epoxidationmentioning

confidence: 99%

“…In the epoxidations performed without bicarbonate, product conversions were lower and this demonstrated the effect of HCO . [37] The catalyst provided styrene epoxides with higher conversions and epoxide selectivity when PhIO was used as an oxidant as shown in the scheme.…”

Section: Salen-type Ligandmentioning

confidence: 99%

Recent Trends and Prospects in Homogeneous Manganese‐Catalysed Epoxidation

et al. 2021

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“…Metal complexes synthesized from Schiff bases have also showed high activity in asymmetric catalysis (13), and those complexes derived from aromatic carbonyl compounds have found to be very active in metalloprotein modeling as well as asymmetric catalysis (14)(15)(16). Epoxidation reaction catalysis as a special field has received great attention in last few years and many reports have raised on several methods of synthesis of catalytic complexes from 163 many Schiff bases along with their catalytic activity evaluation (17)(18)(19)(20). One of the most important petrochemical industrial reactions is conversion of alkenes to alkene epoxides (21), a process that considers as a primary source for many fine chemicals, hence in organic synthesis researchers from over the globe have engaged in such catalytic epoxidation of alkenes and investigation is directed to olefin epoxidation catalysis (22,23), many transition metal complexes of titanium (24), manganese (25), molybdenum (26), and rhenium (27) have been synthesized and their activities were tested in the alkene epoxidation.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, DFT calculations, and catalytic epoxidation of two oxovanadium(IV) Schiff base complexes

Wady

Khan

Alotaibi

et al. 2022

Journal of the Turkish Chemical Society Section A: Chemistry

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The present paper reports the synthesis, characterization, and DFT calculations of two oxovanadium (IV) Schiff base complexes symbolized as VOL1 and VOL2, which prepared by the reaction of bivalent tridentate Schiff base ligands (E)-2-((5-chloro-2-hydroxybenzylidene)amino)acetic acid and (E)-2-((2-hydoxy-5-nitrobenzylidene)amino)acetic acid and VO(acac)2 as vanadium source. The Schiff base ligands and its oxovanadium (IV) complexes were characterized by the elemental analysis (C, H, N), FTIR, 1 H NMR and 13 C NMR, DFT calculations were performed to derive some of their molecular properties. Schiff base ligands coordinated to vanadium center via nitrogen from the azomethine group and one oxygen from the hydroxyl attached to the benzene ring and one oxygen from hydroxyl of carboxyl group. The catalytic activity of the two complexes were tested against cyclooctene and found that both complexes were highly effective and selective in optimized conditions when used as cyclooctene epoxidation catalysts with the conversion percentage of 91.85% (with VOL1) and 87.40% (with VOL2) at 78 °C within a period of ten hours. To understand the structural properties of the two complexes, the two complexes were well optimized at B3LYP/6-31G(d,p) level of theory, structural parameters such as electron affinity, global electrophilicity, global hardness, electronegativity, ionization potential, and electron chemical potential based on HOMO and LUMO energy values were calculated.

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Nickel(II) and copper(II) complexes of new unsymmetrically-substituted tetradentate Schiff base ligands: Spectral, structural, electrochemical and computational studies

Cisterna

Artigas

Fuentealba

et al. 2017

Inorganica Chimica Acta

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International audienceThe synthesis, spectroscopic and structural characterization, electrochemical properties and theoretical studies of a series of eight robust neutral Nickel(II) and Copper(II) complexes (4-11) supported by unsymmetrically-substituted N2O2-tetradentate Schiff base ligands are reported. The M(salophen)-type compounds are substituted by either a pair of donor (anisyl, ferrocenyl, methoxy) or acceptor (fluoro, nitro) groups, forming D-pi-D and A-pi-A systems, respectively. The compounds were prepared in good yields by condensation of the free amino group of the desired ONN-tridentate half-unit with the appropriate substituted salicylaldehyde in the presence of hydrated Nickel(II) or Copper(II) acetate salts. They were characterized by elemental analysis, FT-IR, UV-vis, and for diamagnetic species by multinuclear NMR spectroscopy, mass spectrometry and cyclic voltammetry. The crystal structures of one Ni(II) (4) and four Cu(II) complexes (5, 7, 9 and 11) revealed a four-coordinate square-planar environment for the nickel and copper metal ions, with two nitrogen and two oxygen atoms as donors. In 4, 5, 7 and 9, the crystallization solvent interacts through hydrogen bonding with the phenolato oxygen atoms of the Schiff base pocket, while 11 packs as centrosymmetric dimers with an apical CuAO short contact interaction (2.63 angstrom). the cyclovoltammograms of the nickel complexes present an irreversible monoelectronic Ni(II)/Ni(I) reduction wave while those of their copper counterparts exhibit a reversible or quasi-reversible one-electron Cu(II)/Cu(I) redox process. The electronic structures of the eight complexes were analyzed by DFT and TD-DFT calculations

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A mononuclear nickel(II) complex and a dinuclear manganese(III) complex derived from N,N'-bis(5-methoxysalicylidene)-1,2-ethanediamine: Synthesis, crystal structures and catalytic epoxidation property

Cited by 3 publications

References 24 publications

Recent Trends and Prospects in Homogeneous Manganese‐Catalysed Epoxidation

Recent Trends and Prospects in Homogeneous Manganese‐Catalysed Epoxidation

Synthesis, characterization, DFT calculations, and catalytic epoxidation of two oxovanadium(IV) Schiff base complexes

Nickel(II) and copper(II) complexes of new unsymmetrically-substituted tetradentate Schiff base ligands: Spectral, structural, electrochemical and computational studies

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