Iron complex chemical change

Azari and Feeney (7) suggested that human serum transferrin and chicken ovotransferrin underwent structural changes on chelation of metal ions which stabilized the molecule to denaturation and proteolysis. This later was extended (8) to include stabilization to chemical cleavage or modification. A similar interpretation also was made by Glazer and McKenzie (55) who further suggested that the iron complex might provide two crosslinks between widely separated sections of the peptide chains. 

Structural and spectroscopic consequences of a chemical change in an iron complex... 

What happens inside the blast furnace to recover the iron from its ore The actual chemical changes that occur are complex. A simplified explanation begins with the reaction of oxygen in hot air with coke, a form of carbon. Some of the coke burns to form carbon dioxide. 

Supramolecular polymers which iron-complexes along the anionic main chain were complexed with cationic block copolymers (Fig. 23) [272,273]. However, the applied redox reaction hardly changed the micellar morphologies, although the payload could be released and entrapped upon a chemical redox stimulus. Similarly, nanoparticles were developed for the redox-triggered release of drugs (here by redox-induced scission of polymer-attached trimethyl-locked benzoquinone) [274],... 

Perhaps chemists will be able to mimic nature without duplicating the iron-sulfur-molybdenum structure. For example, a zirconium complex with tetramethyl cyclopentadiene can bind dinitrogen in a manner that breaks the NON bond, as shown below. Treatment with hydrogen gas results in formation of small amounts of ammonia. Although the yields are too low to make this a viable commercial process, researchers hope to make the process more efficient through chemical modifications and changes in conditions. 

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