H2S/Thiols, NO•, and NO–/HNO: Interactions with Iron Porphyrins

ACS Omega ◽  
2022 ◽  
Author(s):  
Silvina Bieza ◽  
Agostina Mazzeo ◽  
Juan Pellegrino ◽  
Fabio Doctorovich
Keyword(s):  
Iron Porphyrins

Reductive Dehalogenation of Environmental Contaminants: A Critical Review

1989 ◽  
Vol 24 (2) ◽  
pp. 299-322 ◽  
Author(s):  
R. M. Baxter
Keyword(s):  
Hydrogen Atom ◽  
Aromatic Compounds ◽  
Reductive Dechlorination ◽  
Halogen Atom ◽  
Environmental Contaminants ◽  
Methanogenic Bacteria ◽  
Photochemical Reactions ◽  
Reductive Dehalogenation ◽  
Iron Porphyrins ◽  
Aliphatic Compounds

Abstract It is generally recognized that reductive processes are more important than oxidative ones in transforming, degrading and mineralizing many environmental contaminants. One process of particular importance is reductive dehalogenation, i.e., the replacement of a halogen atom (most commonly a chlorine atom) by a hydrogen atom. A number of different mechanisms are involved in these reactions. Photochemical reactions probably play a role in some instances. Aliphatic compounds such as chloroethanes, partly aliphatic compounds such as DDT, and alicyclic compounds such as hexachlorocyclohexane are readily dechlorinated in the laboratory by reaction with reduced iron porphyrins such as hematin. Many of these are also dechlorinated by cultures of certain microorganisms, probably by the same mechanism. Such compounds, with a few exceptions, have been found to undergo reductive dechlorination in the environment. Aromatic compounds such as halobenzenes, halophenols and halobenzoic acids appear not to react with reduced iron porphyrins. Some of these however undergo reductive dechlorination both in the environment and in the laboratory. The reaction is generally associated with methanogenic bacteria. There is evidence for the existence of a number of different dechlorinating enzymes specific for different isomers. Recently it has been found that many components of polychlorinated biphenyls (PCBs), long considered to be virtually totally resistant to environmental degradation, may be reductively dechlorinated both in the laboratory and in nature. These findings suggest that many environmental contaminants may prove to be less persistent than was previously feared.

Manganese- and iron-porphyrins embedded in a polydimethylsiloxane membrane: a selective oxidation catalyst

1998 ◽  
Vol 134 (1-3) ◽  
pp. 209-214 ◽  
Author(s):  
P.E.F Neys ◽  
I.F.J Vankelecom ◽  
M L'abbé ◽  
R.F Parton ◽  
E Cenlemans ◽  
...  
Keyword(s):  
Selective Oxidation ◽  
Oxidation Catalyst ◽  
Iron Porphyrins

Reversible iron-nitrogen migration of alkyl, aryl, or vinyl groups in iron porphyrins: a possible passage between .sigma. FeIII(porphyrin)(R) and FeII(N-R)(porphyrin)complexes

1982 ◽  
Vol 104 (22) ◽  
pp. 6159-6161 ◽  
Author(s):  
Daniel Mansuy ◽  
Jean Paul Battioni ◽  
Daniel Dupre ◽  
Eric Sartori ◽  
Genevieve Chottard
Keyword(s):  
Iron Porphyrins ◽  
Alkyl Aryl
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