Thermal ROP of Other Strained Metallocenophanes

The thermal ROP methodology established for silicon-bridged [l]ferrocenophanes has been extended to many other strained metallocenophanes, which has allowed access to high molecular weight polyferrocenes with different spacer groups. As discussed later (see Section 3.3.7), this permits modification of the properties of the polymer, such as the extent of the metal-metal interactions. 

Polyferrocenylphenylphosphines 3.29, analogous to those previously synthesized by polycondensation routes (Section 3.2.2), have also been prepared by thermal ROP of phosphorus-bridged [l]ferrocenophanes 3.28 (Eq. 3.13) [72]. The solubility of the materials was observed to increase when the cyclopentadienyl rings were substituted with n-butyl or trimethylsUyl groups. Sulfurization was carried out in order to facilitate their characterization by GPC, as the polyferrocenylphosphine 

Strained [2]metallocenophanes can also function as ROP precursors. For example, hydrocarbon-bridged [2]ferrocenophanes 3.36 (M = Fe, Ei = E2=CH2) were found to undergo ROP at 300°C, providing access to polyferrocenylethylenes 3.37 (M = Fe, 

Thermal copolymerization of different [l]ferrocenophanes has also been reported to give polyferrocenylsUane random copolymers [80]. In addition, random copolymers 3.39 derived from [l]ferrocenophanes and silicon-bridged bis(benzene)chromium complexes have been synthesized (Eq. 3.16) [81]. 

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Thermal ROP of silicon-bridged [1 Jferrocenophanes Thermal ROP of other strained metallocenophanes Living anionic ROP of strained metallocenophanes Transition metal-catalyzed ROP of strained metallocenophanes Other ROP methods for strained metallocenophanes Properties of polyferrocenylsilanes... 

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