Bridged tricyclic polymers

A theoretical study of a variety of tricyclic polymers with different types of bridging groups has been performed for the fused bithiophene system (Figure 9). Geometrical structures of the polymers were obtained from semi-empirical SCF band calculations and the electronic properties from the modified extended Hiickel band calculations <1997PCB10248, 1997JCP(107)10607>. 

Crown ether-functionalized polyphenylenes are a class of electroactive polymers obtained by electropolymerization (anodic coupling) of (di)benzo- or (bi)naphthalene-crown ethers <1998CCR1211, 1998PAC1253>. Tricyclic triphenyl-ene derivatives, such as 78, can be electrogenerated from benzo-15-crown-5 <1989NJC131> and benzo-18-crown-6 <1992JEC399>. Similarly, the anodic oxidation of dibenzo-crown ethers has produced poly(dibenzo-crown ethers), best represented by 79, where triphenylene moieties are presumably two-dimensionally linked via polyether bridges. 

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