Complexes with Redox-active -Conjugated Polymers

2 Complexes with Redox-active ic-Conjugated Polymers 

The TT-conjugated polymers or oligomers are able to serve as redox-active 7C-conju-gated ligands with coordination capability towards transition metals as described above. Few papers have been published on the complexation behavior of the redox-active Tt-conjugated polymers. Multi-coordination to -conjugated polymers possessing relevant redox function is likely to provide multi-redox systems. 

2 Macromolecular Conjugated Complexes 171 [ 7C-Conjugated polymer - Metal ]o  

A catalytic scheme for the palladium-catalyzed oxidation in the presence of the redox-active ligand 

The difference in the ratio is accounted for as follows. Two coordination sites are available with Pd(OAc)2 or PdCl2(MeCN)2, but the complex 3 bearing the tri-dentate ligand has only one free coordination site. A cross-linked polyaniline network complex 4 is considered to be formed in the former case. On the contrary, the latter complexation affords the single-strand conjugated complex 5. Thus, a hybrid system composed of transition metals and 7C-conjugated polymers is controlled structurally (Fig. 3.11). 

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The conjugated polymer complexes composed of polyanilines or polypyrroles are performed to afford the redox systems depending on their structnres and redox properties. As mentioned in the Sect. 3.2, the complexation with copper salts can affect the redox properties of polyanilines to form the reversible redox cycle [17]. The conjugated polymer complex can serve as an oxidation catalyst [18,20,23,24], wherein the coordination of the QD moiety might play an important role in a reversible redox processes of the complexes. Polyanilines or polypyrroles are effectively employed as a redox-active ligand in the Wacker reaction as mentioned in Sect. 3.2. 

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