Electrocatalytic Reduction of Molecular Oxygen Using Water-Soluble and Immobilized Iron and Cobalt Porphyrins

1982 ◽  
pp. 601-624 ◽  
Author(s):  
PAUL A. FORSHEY ◽  
THEODORE KUWANA ◽  
NAGAO KOBAYASHI ◽  
TETSUO OSA
Keyword(s):  
Molecular Oxygen ◽  
Water Soluble ◽  
Electrocatalytic Reduction ◽  
Cobalt Porphyrins

Electrochemical and Spectroelectrochemical Characterization of Water-soluble, β-Pyrrolebrominated Cobalt Porphyrins

1998 ◽  
Vol 02 (05) ◽  
pp. 429-437 ◽  
Author(s):  
FRANCIS D'SOUZA ◽  
YI-YING HSIEH ◽  
G. R. DEVIPRASAD
Keyword(s):  
Water Soluble ◽  
Redox Couple ◽  
Redox Potentials ◽  
Complete Elimination ◽  
Porphyrin Derivatives ◽  
Cobalt Porphyrins ◽  
Bulk Electrolysis ◽  
Ph Conditions ◽  
Ph Dependent

The electrochemical and spectroelectrochemical characterization of two water-soluble porphyrins, namely the tetrachloro salt of cobalt(II) tetrakis-(N-methyl pyridyl)-β-octabromoporphyrin, [( Br 8 TMPyP ) Co II] Cl 4, and the tetrasodium salt of cobalt(II) tetrakis-(4-sulfonatophenyl)-β-octabromoporphyrin, Na 4[( Br 8 TPPS ) Co II], under different pH conditions is reported. The investigated porphyrins are highly non-planar and electron-deficient owing to the presence of eight bromides at the β-pyrrole positions and the four meso-aryl substituents. The redox potentials corresponding to the first oxidation and first reduction are shifted positively compared with the redox potentials of the respective unbrominated porphyrin derivatives. Spectroelectrochemical studies reveal the formation of a cobalt(III) complex during the first oxidation of both cobalt porphyrins. The first reduction of Br 8 TPPS ) Co II]4− results in a cobalt(I) complex, while involvement of the peripheral N-methyl pyridyl groups in the case of Br 8 TMPyP ) Co II]4+ is suggested. The peak potentials of the first oxidation corresponding to a Co II/ Co III redox couple of both investigated compounds are found to be pH-dependent. Debromination of the β-pyrrole bromo substituents of Br 8 TMPyP ) Co II]4+ at more negative potentials is observed. The UV-vis spectrum obtained after bulk electrolysis of Br 8 TMPyP ) Co II]4+ at −1.0 V vs Ag / AgCl followed by reoxidation at 0.2 V indicates complete elimination of the bromo substituents of the porphyrin periphery.

Electrocatalytic reduction of Molecular Oxygen with a Copper (II) Coordination Polymer

2020 ◽  
Vol 34 (5) ◽  
Author(s):  
Mohammad Ali Kamyabi ◽  
Fatemeh Soleymani‐Bonoti ◽  
Leila Taheri ◽  
Ahmad Morsali ◽  
Hassan Hosseini‐Monfared
Keyword(s):  
Coordination Polymer ◽  
Molecular Oxygen ◽  
Electrocatalytic Reduction

One pot, microwave-assisted copper(I)-catalyzed dithiocarbamation: A facile introduction of dithiocarbamate on imidazopyridines

2021 ◽  
Author(s):  
Kritika Laxmikeshav ◽  
Akash P Sakla ◽  
Stephy Elza John ◽  
Shankaraiah Nagula
Keyword(s):  
Molecular Oxygen ◽  
Water Soluble ◽  
One Pot ◽  
Microwave Assisted

A facile and proficient dithiocarbamation of imidazo[1,2-a]pyridines and other imidazoheterocycles with in situ generated dithiocarbamates is established using a water-soluble, stable copper(I) catalyst and molecular oxygen under microwave conditions. The...

Sign in / Sign up

Export Citation Format

Share Document