Redox-active dendrimers

REDOX-ACTIVE DENDRIMERS, RELATED BUILDING BLOCKS, AND OLIGOMERS... 

Some of the materials highlighted in this review offer novel redox-active cavities, which are candidates for studies on chemistry within cavities, especially processes which involve molecular recognition by donor-acceptor ii-Jt interactions, or by electron transfer mechanisms, e.g. coordination of a lone pair to a metal center, or formation of radical cation/radical anion pairs by charge transfer. The attachment of redox-active dendrimers to electrode surfaces (by chemical bonding, physical deposition, or screen printing) to form modified electrodes should provide interesting novel electron relay systems. 

FROM THE SOLUTION THE SOLID STATE ELECTROCHEMISTRY OF REDOX-ACTIVE DENDRIMER FILMS... 

There is a great and interesting variety of investigations of redox-active dendrimers on... 

These examples illustrate a broad range of interesting behaviors for surface-confined, redox-active dendrimers. However, let us return to our original questions How does the generation of a dendrimer influence the rate and redox potential for heterogeneous electron transfers Now we can ask this question with regard to surface-confined dendrimers. 

Figure 5.3 Schematic representation of the light-harvesting redox-active dendrimers and...

Redox-Active Dendrimers, Related Building Blocks, and Oligomers [M. R. Bryce, W. Davonport, Chapt. 2]. 

Scheme 5.2 A simple synthetic route to hexabutenylbenzene 8, being a useful starting material for the preparation of redox active dendrimers...

Many recent reviews report on dendrimers in general [1,3, 5-14], or focus on more specific topics like dendrimers containing metals [15-23], or elements of groups 13, 14 and 15 [23-27], or on redox-active dendrimers [16, 19, 28, 29], For reasons of space, it is impossible here to review all the published literature concerning dendrimers involved in electron transfer processes only selected examples will be presented to illustrate the diversity of chemical structures and research issues that can be encountered in this field. Synthetic procedures will not be dealt with the interested reader should refer to the original literature. 

Fullerene has also been incorporated in redox-active dendrimers. In 62 the Ceo unit has been modified by connecting a single polyaryl-ether dendritic branch [132]. Electrochemical reduction in CH2CI2 of 62 features three reversible waves, which occur at a potential more negative than that of the free Cso molecule. This shift was ascribed to an insulating effect on the connected dendritic structure. 

Castro R, Cuadrado I, Alonso B, Casado CM, Moran M, Kaifer AE (1997) Multisite inclusion complexation of redox active dendrimer guests. J Am Chem Soc 119 5760-5761... 

Cardona CM, Kaifer AE (1998) Asymmetric redox-active dendrimers containing a ferrocene subunit. Preparation, characterization, and electrochemistry. J Am Chem Soc 120 4023 1024... 

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