Tri- and tetradentate copper complexes: a comparative study on homogeneous and heterogeneous catalysis over oxidation reactions

2015 ◽  
Vol 5 (1) ◽  
pp. 325-338 ◽  
Author(s):  
Salam J. J. Titinchi ◽  
Gavin Von Willingh ◽  
Hanna S. Abbo ◽  
Rajendra Prasad
Keyword(s):  
Heterogeneous Catalysis ◽  
Comparative Study ◽  
Copper Complexes ◽  
Oxidation Reactions ◽  
Cu Complexes

A comparative catalytic study between heterogeneous (zeolite-encapsulated Cu complexes) and homogeneous analogues over oxidation reactions was undertaken in detail.

Conglomerated system of Ag nanoparticles decorated Al2O3 supported cobalt and copper complexes with enhanced catalytic activity for oxidation reactions

2019 ◽  
Vol 462 ◽  
pp. 104-113 ◽  
Author(s):  
Tonmoy Chakraborty ◽  
Aratrika Chakraborty ◽  
Suvendu Maity ◽  
Debasis Das ◽  
Tanmay Chattopadhyay
Keyword(s):  
Catalytic Activity ◽  
Ag Nanoparticles ◽  
Copper Complexes ◽  
Oxidation Reactions

scholarly journals Copper Complexes of Benzoylacetone Bis-Thiosemicarbazones: Metal and Ligand Based Redox Reactivity

2021 ◽  
Vol 74 (1) ◽  
pp. 34 ◽  
Author(s):  
Jessica K. Bilyj ◽  
Jeffrey R. Harmer ◽  
Paul V. Bernhardt
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Cyclic Voltammetry ◽  
Copper Complexes ◽  
Atmospheric Oxygen ◽  
The Other ◽  
Oxidation Reactions ◽  
Paramagnetic Resonance ◽  
Time Resolved ◽  
Vis Spectroscopy ◽  
Electron Paramagnetic

Bis-thiosemicarbazones derived from the β-diketone benzoylacetone (H3banR, R=Me, Et, Ph) are potentially tetradentate N2S2 ligands whose coordination chemistry with copper is reported. In the absence of oxygen and in the presence of base they form anionic CuII complexes of the fully deprotonated ligands [CuII(banR)]–. Upon exposure to atmospheric oxygen they undergo a complex series of reactions leading to two types of products; one a ligand oxidised ketone complex [CuII(banRO)] and the other an unprecedented dimeric di-CuIII complex [(CuIII(banR))2] depending on the R substituent. Time-resolved UV-vis spectroscopy, cyclic voltammetry, spectroelectrochemistry, and electron paramagnetic resonance (EPR) spectroscopy have been used to identify intermediates on the way to stable products formed under both anaerobic and aerobic conditions. It is found that both ligand-centred and Cu-centred oxidation reactions are occurring in parallel leading to this unusually complicated mixture of products.

scholarly journals Heterogeneous catalysis with encapsulated haem and other synthetic porphyrins: Harnessing the power of porphyrins for oxidation reactions

2018 ◽  
Vol 16 (1) ◽  
pp. 763-789 ◽  
Author(s):  
Nicola A. Dare ◽  
Timothy J. Egan
Keyword(s):  
Catalytic Activity ◽  
Heterogeneous Catalysis ◽  
Heterogeneous Catalysts ◽  
Organic Substrates ◽  
Oxidation Reactions ◽  
Highly Efficient ◽  
Protein Environment

AbstractEncapsulated metalloporphyrins have been widely studied for their use as efficient heterogeneous catalysts, inspired by the known catalytic activity of porphyrins in haemoproteins. The oxidation of organic substrates by haemoproteins is one of the well-known roles of these proteins, in which the haem (ferriprotoporphyrin IX = FePPIX) cofactor is the centre of reactivity. While these porphyrins are highly efficient catalysts in the protein environment, once removed, they quickly lose their reactivity. It is for this reason that they have garnered much interest in the field of heterogeneous catalysis of oxidation reactions. This review details current research in the field, focusing on the application of encapsulated haem, and other synthetic metalloporphyrins, applied to oxidation reactions.

scholarly journals Synthesis, crystal structure and EPR spectroscopic analysis of novel copper complexes formed from N-pyridyl-4-nitro-1,8-naphthalimide ligands

2014 ◽  
Vol 43 (17) ◽  
pp. 6468-6479 ◽  
Author(s):  
Jonathan A. Kitchen ◽  
Paulo N. Martinho ◽  
Grace G. Morgan ◽  
Thorfinnur Gunnlaugsson
Keyword(s):  
Crystal Structure ◽  
Copper Complexes ◽  
Spectroscopic Analysis ◽  
X Ray ◽  
X Ray Crystallography ◽  
Cu Complexes

The synthesis of two new monodentate pyridyl based 4-nitro-1,8-naphthalimide ligands and their corresponding Cu-complexes (using various salts) is described. Of these, complexes 1–3 and 5, all gave rise to structures that were characterised by X-ray crystallography and EPR.

From Prochiral N-Heterocyclic Carbenes (NHC) to Optically Pure Copper Complexes: New Opportunities in Asymmetric Catalysis

2019 ◽  
Author(s):  
Lingyu Kong ◽  
Jennifer Morvan ◽  
Delphine Pichon ◽  
Marion Jean ◽  
Muriel Albalat ◽  
...  
Keyword(s):  
Asymmetric Catalysis ◽  
Copper Complexes ◽  
Pure Copper ◽  
Heterocyclic Carbenes ◽  
Allylic Alkylation ◽  
Chiral Hplc ◽  
Pure Cu ◽  
First Time ◽  
Optically Pure ◽  
Cu Complexes

Well-defined optically pure copper-complexes are obtained from prochiral N- Heterocyclic Carbene (NHC) ligands. As predicted by DFT calculations, our strategy capitalizes on the formation of a metal-carbene bond which induces axial chirality. Configurationally stable (Sa)- and (Ra)-atropisomers of various Cu-complexes are isolated by preparative chiral HPLC in nearly quantitative yields and excellent optical purities (>99.5%). Their catalytic performances are illustrated in asymmetric allylic alkylation with high regioselectivity and enantioinductions. Importantly, the carbene transfer from an optically pure Cu-complex to gold or palladium center reveals, for the first time, a full stereoretentivity, supporting the hypothesis of an associative mechanism for the transmetalation.

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