Title:	Electrochemistry of N4 Macrocyclic Metal Complexes
Authors:	Bedioui, Fethi H. Zagal, Jose
Keywords:	Electrochemistry
Issue Date:	2016
Publisher:	Springer International Publishing Switzerland
Description:	Molecules having an MN4, or also so-called M-N4, moiety are common in nature and are involved in the catalysis of electron transfer reactions, photosynthesis, and O2 transport, to name a few instances. For this reason, there has been great interest in both artificial and naturally occurring MN4 complexes in various fields, including electrochemistry. For example, metalloporphyrins are used as biomimetic models to study several biological redox processes, molecular oxygen transport, and catalytic activation to mimic monooxygenase enzymes of the cytochrome P450 in particular. They are also well known as efficient catalysts for the oxidative degradation of many types of pollutants (such as organohalides and phenols) and residual wastes. The discovery in 1965 by Jasinski that cobalt phthalocyanine presented catalytic activity for the reduction of molecular oxygen in aqueous Media triggered the attention of several research groups in the 1970s. They focused their attention on MN4 complexes as potential catalysts for the reduction of O2 with the aim of finding a replacement for expensive Pt in the cathode of fuel cells. However, even though some of these complexes are stable under many conditions, they lack the long-term stability required for fuel cell performance. For this reason, attention has been focused on pyrolyzed MN4 complexes, which are more stable than intact materials. Materials prepared from different ingredients, like nitrogen-containing compounds, ammonia, different carbons, and metal salts, upon pyrolysis at temperatures of 1000 °C or more produce active and stable materials, many of which seem to have M-N4 centers, with both pyrrolic and pyridinic nitrogens. The MN4 centers are created during the pyrolysis, but the mechanism for their formation is little understood.
URI:	http://10.6.20.12:80/handle/123456789/74015
ISBN:	978-3-319-31170-8
Appears in Collections:	Chemistry

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