Multistage redox systems

Due to their structural and electrochemical properties, it would appear almost obvious to combine ferrocene-containing fragments and derivatives of tetra-thiafulvalene to construct new donors for conducting CT complexes. This approach would lead to new multistage redox systems that are likely to display different solid state properties to those of their congeners. However, only very few derivatives of this type have been so far reported. What appears to be the first compound belonging to this class was prepared by Ueno et al. in 1980 [64]. Bis(ferrocenyl)tetrathiafulvalene was obtained as a transjcis isomeric mixture (6 and 7, respectively) and was shown to form 1 1 CT complexes with TCNQ and DDQ. These materials possess... 

Dendralenes, acyclic cross-conjugated polyenes having a nonplanar structure, containing DT rings (DT[ ]dendralenes) have received considerable attention as novel multistage redox systems. The [3]- and [4]-dendralenes containing... 

However, compound 100 exhibits excellent acceptor properties and satisfies the essential molecular design sftategies for new molecular metals [189], i.e. a multistage redox system and the possibility of interstack interactions due to the presence of sulphur atoms leading to the enhancement of dimensionality. 

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