The Role of Equatorial and Axial Ligands in Promoting the Activity of Non-Heme Oxidoiron(IV) Catalysts in Alkane Hydroxylation

2007 ◽  
Vol 2007 (19) ◽  
pp. 3023-3033 ◽  
Author(s):  
Leonardo Bernasconi ◽  
Manuel J. Louwerse ◽  
Evert Jan Baerends
Keyword(s):  
Axial Ligands ◽  
Alkane Hydroxylation

On the role of the axial ligands in heme-based catalysis

1995 ◽  
Vol 59 (2-3) ◽  
pp. 490
Author(s):  
I.M.C.M. Rietjens ◽  
J. Spee ◽  
R. Weiss ◽  
A.X. Trautwein ◽  
W. Van Dongen ◽  
...  
Keyword(s):  
Axial Ligands

scholarly journals Role of redox-active axial ligands of metal porphyrins adsorbed at solid–liquid interfaces in a liquid-STM setup

2020 ◽  
Vol 11 ◽  
pp. 1264-1271
Author(s):  
Thomas Habets ◽  
Sylvia Speller ◽  
Johannes A A W Elemans
Keyword(s):  
Tunneling Current ◽  
Liquid Interfaces ◽  
Manganese Porphyrins ◽  
Metal Porphyrins ◽  
Axial Ligands ◽  
Redox Active ◽  
Conductive Surface ◽  
Solid Liquid ◽  
Porphyrin Moiety

In a liquid-STM setup environment, the redox behavior of manganese porphyrins was studied at various solid–liquid interfaces. In the presence of a solution of Mn(III)Cl porphyrins in 1-phenyloctane, which was placed at a conductive surface, large and constant additional currents relative to a set tunneling current were observed, which varied with the magnitude of the applied bias voltage. These currents occurred regardless of the type of surface (HOPG or Au(111)) or tip material (PtIr, Au or W). The additional currents were ascribed to the occurrence of redox reactions in which chloride is oxidized to chlorine and the Mn(III) center of the porphyrin moiety is reduced to Mn(II). The resulting Mn(II) porphyrin products were identified by UV–vis analysis of the liquid phase. For solutions of Mn(III) porphyrins with non-redox active acetate instead of chloride axial ligands, the currents remained absent.

Role of Heme Axial Ligands in the Conformational Stability of the Native and Molten Globule States of Horse Cytochromec

1996 ◽  
Vol 256 (1) ◽  
pp. 172-186 ◽  
Author(s):  
Daizo Hamada ◽  
Yutaka Kuroda ◽  
Mikio Kataoka ◽  
Saburo Aimoto ◽  
Tetsuro Yoshimura ◽  
...  
Keyword(s):  
Molten Globule ◽  
Conformational Stability ◽  
Axial Ligands

The role of axial ligands for the structure and function of chlorophylls

2006 ◽  
Vol 12 (1) ◽  
pp. 49-61 ◽  
Author(s):  
Jimmy Heimdal ◽  
Kasper P. Jensen ◽  
Ajitha Devarajan ◽  
Ulf Ryde
Keyword(s):  
Structure And Function ◽  
Axial Ligands ◽  
And Function

A Computational Approach to Understand the Role of Metals and Axial Ligands in Artificial Heme Enzymes Catalyzed C-H Insertion

2021 ◽  
Author(s):  
Reena Balhara ◽  
Ritwika Chatterjee ◽  
Garima Jindal
Keyword(s):  
Computational Approach ◽  
Cytochrome P450s ◽  
Heme Enzymes ◽  
Axial Ligands ◽  
Naturally Occurring

Engineered heme enzymes such as myoglobin and cytochrome P450s metalloproteins are gaining widespread importance due to their efficiency in catalyzing non-natural reactions. In a recent strategy, the naturally occurring Fe...

scholarly journals The Interaction of Covalently Bound Heme with the CytochromecMaturation Protein CcmE

2004 ◽  
Vol 279 (50) ◽  
pp. 51981-51988 ◽  
Author(s):  
Takeshi Uchida ◽  
Julie M. Stevens ◽  
Oliver Daltrop ◽  
Edgar M. Harvat ◽  
Lin Hong ◽  
...  
Keyword(s):  
Plant Mitochondria ◽  
Heme Iron ◽  
Histidine Residue ◽  
Axial Ligands ◽  
Heme Ligands ◽  
Essential Function ◽  
Resonance Raman Spectra ◽  
Vinyl Group ◽  
Covalently Bound

The heme chaperone CcmE is a novel protein that binds heme covalently via a histidine residue as part of its essential function in the process of cytochromecbiogenesis in many bacteria as well as plant mitochondria. In the continued absence of a structure of the holoform of CcmE, identification of the heme ligands is an important step in understanding the molecular function of this protein and the role of covalent heme binding to CcmE during the maturation ofc-type cytochromes. In this work, we present spectroscopic data that provide insight into the ligation of the heme iron in the soluble domain of CcmE fromEscherichia coli. Resonance Raman spectra demonstrated that one of the heme axial ligands is a histidine residue and that the other is likely to be Tyr134. In addition, the properties of the heme resonances of the holo-protein as compared with those of a form of CcmE with non-covalently bound heme provide evidence for the modification of one of the heme vinyl side chains by the protein, most likely the 2-vinyl group.

scholarly journals Octahedral Co(III) salen complexes: the role of peripheral ligand electronics on axial ligand release upon reduction

2018 ◽  
Vol 96 (2) ◽  
pp. 110-118 ◽  
Author(s):  
Chen Zhang ◽  
Mathew Sutherland ◽  
Khrystyna Herasymchuk ◽  
Ryan M. Clarke ◽  
John R. Thompson ◽  
...  
Keyword(s):  
Ligand Exchange ◽  
Reduction Potential ◽  
Reduction Process ◽  
Axial Ligand ◽  
Lewis Acidity ◽  
Dominant Factor ◽  
Axial Ligands ◽  
Salen Complexes ◽  
Reducing Conditions

A series of octahedral CoIII salen complexes (where salen represents a N2O2 bis-Schiff-base bis-phenolate framework) were prepared with axial imidazole ligating groups. When using 1-methylimidazole (1-MeIm) axial ligands, the CoIII/CoII reduction potential could be altered by 220 mV via variation of the electron-donating ability of the para-ring substituents (R = H (1), OMe (2), tBu (3), Br (4), NO2 (5), and CF3 (6)). In addition, the irreversibility of the reduction process suggested substantial geometrical changes and axial ligand exchange upon reduction to the more labile CoII oxidation state. Installing an imidazole-coumarin conjugate as the axial ligands resulted in fluorescence quenching when bound to the CoIII centre (R = H (7), OMe (8), and CF3 (9)). The redox properties and fluorescence increase upon ligand release for 7–9 were studied under reducing conditions and in the presence of excess competing ligand (1-MeIm). It was determined that the Lewis acidity of the CoIII centre was the dominant factor in controlling axial ligand exchange for this series of complexes.

Synthesis and characterization of [Ru(NCNHCO)(bpy)L]+ complexes and their reactivity towards water oxidation

2018 ◽  
Vol 42 (4) ◽  
pp. 2476-2482 ◽  
Author(s):  
Fanglin Cai ◽  
Wei Su ◽  
Hussein A. Younus ◽  
Kui Zhou ◽  
Cheng Chen ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Synthesis And Characterization ◽  
Axial Ligands

The role of charged axial ligands in tuning the reactivity and stability of Ru WOCs is well-known, less is explored when axial ligands are neutral molecules.

scholarly journals Role of the iron axial ligands of heme carrier HasA in heme uptake and release.

2013 ◽  
Vol 288 (4) ◽  
pp. 2190-2190 ◽  
Author(s):  
Célia Caillet-Saguy ◽  
Mario Piccioli ◽  
Paola Turano ◽  
Gudrun Lukat-Rodgers ◽  
Nicolas Wolff ◽  
...  
Keyword(s):  
Heme Uptake ◽  
Axial Ligands ◽  
Uptake And Release
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