Concerted Proton–Electron Transfer in Electrocatalytic O2 Reduction by Iron Porphyrin Complexes: Axial Ligands Tuning H/D Isotope Effect

2015 ◽  
Vol 54 (5) ◽  
pp. 2383-2392 ◽  
Author(s):  
Sudipta Chatterjee ◽  
Kushal Sengupta ◽  
Subhra Samanta ◽  
Pradip Kumar Das ◽  
Abhishek Dey
Keyword(s):  
Electron Transfer ◽  
Isotope Effect ◽  
Iron Porphyrin ◽  
Axial Ligands ◽  
O2 Reduction ◽  
Iron Porphyrin Complexes

Effect of axial ligands on electronic structure and O2 reduction by iron porphyrin complexes: Towards a quantitative understanding of the "push effect"

2015 ◽  
Vol 19 (01-03) ◽  
pp. 92-108 ◽  
Author(s):  
Subhra Samanta ◽  
Pradip Kumar Das ◽  
Sudipta Chatterjee ◽  
Abhishek Dey
Keyword(s):  
Electronic Structure ◽  
Active Sites ◽  
Reduction Reaction ◽  
Axial Ligand ◽  
Iron Porphyrin ◽  
Axial Ligands ◽  
O2 Reduction ◽  
Thiolate Complexes ◽  
Quantitative Understanding ◽  
Iron Porphyrin Complexes

Axial ligands play a dominating role in determining the electronic structure and reactivity of iron porphyrin active sites and synthetic models. Several properties unique to the cysteine bound heme enzyme, cytochrome P450, is attributed to the "push effect" of the thiolate axial ligand. In this mini-review the ground state electronic structure of iron porphyrins with imidazole, phenolate and thiolate complexes, derived using a combination of spectroscopy and DFT calculations, are discussed. The differences in kinetics and selectivity of oxygen reduction reaction (ORR), catalyzed by these iron porphyrin complexes with different axial ligands, help elucidate the varying push effects of the different axial ligands on oxygen activation by ferrous porphyrin. The spectroscopic and kinetic data help to develop a quantitative understanding of the "push effect" and, in particular, the electrostatic and covalent contributions to it.

Ammonium tetrathiomolybdate as a novel electrode material for convenient tuning of the kinetics of electrochemical O2 reduction by using iron–porphyrin catalysts

2016 ◽  
Vol 4 (18) ◽  
pp. 6819-6823 ◽  
Author(s):  
Sudipta Chatterjee ◽  
Kushal Sengupta ◽  
Sabyasachi Bandyopadhyay ◽  
Abhishek Dey
Keyword(s):  
Electron Transfer ◽  
Electrode Material ◽  
Deposition Time ◽  
Active Species ◽  
Iron Porphyrin ◽  
Gold Electrodes ◽  
Redox Active ◽  
O2 Reduction ◽  
Ammonium Tetrathiomolybdate ◽  
Kinetics Of

Ammonium tetrathiomolybdate modified gold electrodes can easily tune the rate of electron transfer to the redox active species when the deposition time is varied.

Tuning the thermodynamic onset potential of electrocatalytic O2 reduction reaction by synthetic iron–porphyrin complexes

2015 ◽  
Vol 51 (49) ◽  
pp. 10010-10013 ◽  
Author(s):  
Sk Amanullah ◽  
Pradip Kumar Das ◽  
Subhra Samanta ◽  
Abhishek Dey
Keyword(s):  
Reduction Reaction ◽  
Iron Porphyrin ◽  
Onset Potential ◽  
Porphyrin Ligand ◽  
O2 Reduction ◽  
Iron Porphyrin Complexes

A porphyrin ligand with two β-pyrrolic electron withdrawing ester groups is synthesized and its Co complex is crystallographically characterized.

scholarly journals Detection of Superoxide Anion Radical Using Iron Porphyrin Complexes Bound to Electropolymerized Axial Ligands

2009 ◽  
Vol 77 (11) ◽  
pp. 940-944
Author(s):  
Makoto YUASA ◽  
Tomohiro KOBAYASHI ◽  
Tetsuya AOKI ◽  
Hiroyuki FUJII ◽  
Masatsugu IGARASHI ◽  
...  
Keyword(s):  
Superoxide Anion ◽  
Anion Radical ◽  
Superoxide Anion Radical ◽  
Iron Porphyrin ◽  
Axial Ligands ◽  
Iron Porphyrin Complexes

O2 Reduction Reaction by Biologically Relevant Anionic Ligand Bound Iron Porphyrin Complexes

2013 ◽  
Vol 52 (22) ◽  
pp. 12963-12971 ◽  
Author(s):  
Subhra Samanta ◽  
Pradip Kumar Das ◽  
Sudipta Chatterjee ◽  
Kushal Sengupta ◽  
Biswajit Mondal ◽  
...  
Keyword(s):  
Reduction Reaction ◽  
Iron Porphyrin ◽  
Biologically Relevant ◽  
Anionic Ligand ◽  
O2 Reduction ◽  
Iron Porphyrin Complexes

Aliphatic hydroxylation catalyzed by iron porphyrin complexes

1983 ◽  
Vol 105 (20) ◽  
pp. 6243-6248 ◽  
Author(s):  
John T. Groves ◽  
Thomas E. Nemo
Keyword(s):  
Iron Porphyrin ◽  
Iron Porphyrin Complexes
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