Catalysis of redox reactions

As seen in Figure 2.1, the substitution of the aluminum ions of the octahedral layer with iron(II) ions leads to the formation of the negative layer charge of montmorillonite. In addition, as a cation, iron ions can be present in the interlayer space also. In both places, the oxidation state of iron can be Fe(II) and Fe(III). Reactions involving the back-and-forth transition between the two oxidation states play a significant role in the redox processes of rocks and soils as well as in the catalysis of redox reactions (Stucki et al. 2002 Stucki 2008). 

Redox catalysis is the catalysis of redox reactions and constitutes a broad area of chemistry embracing biochemistry (cytochromes, iron-sulfur proteins, copper proteins, flavodoxins and quinones), photochemical processes (energy conversion), electrochemistry (modified electrodes, organic synthesis) and chemical processes (Wacker-type reactions). It has been reviewed altogether relatively recently [2]. We will essentially review here the redox catalysis by electron reservoir complexes and give a few examples of the use of ferrocenium derivatives. 

The role of transition metals in the catalysis of redox reactions of l-ascorbic acid frequently involves a step in which the transition metal ion is itself reduced. 

Experimental antitumor agents such as streptonigrin, bisthiosemicarbazones, and perhaps monothiosemicarbazones must form iron or copper complexes to become biologically active as catalysts of oxidant damage to cells. In sum, metal-based catalysis of redox reactions in cells describes a major topic in cancer therapeutics. Nevertheless, it has remained underdeveloped as a theme for study and application. The sections below provide a coordinated review and perspective on the subject of redox-active, metal-dependent drugs in cancer chemotherapy. 

Enzymatic catalysis of redox reactions involving the ascorbate system... 

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