The second volume in a projected series that will look at macromolecules containing metal and metal-like elements — a group that's grown explosively since the 1990s and represents marriages among many disciplines, including chemistry, biochemistry, materials science, engineering, biomedical science, and physics. Vol. 2 highlights the development of organoiron polymers since the early 1950s, describes many of the different classes of these macromolecules and current trends in the field, and reviews important findings from research groups around the world. The volume focuses on two classes of organoiron polymers: ferrocene-based macromolecules and polymers containing cationic arene cyclopentadienyliron complexes incorporated into their structures.