Redox-active Star Molecules Incorporating the 4-Benzoylpyridinium Cation: Implications for the Charge Transfer Efficiency along Branches vs. Across the Perimeter in Dendrimers
We report the redox properties of four star systems incorporating the 4-benzoyl-N-alkylpyridinium cation; the redox potential varies along the branches but remains constant at fixed radii. Bulk electrolysis shows that at a semi-infinite time scale all redox centers are electrochemically accessible. However, voltammetric analysis (cyclic voltammetry and differential pulse voltammetry) shows that only two of the three redox-active centers in the perimeter are electrochemically accessible during potential sweeps as slow as 20 mV s-1 and as fast as 10 V s-1. On the contrary, both redox centers along branches are accessible electrochemically within the same time frame. These results are explained in terms of slow through-space charge transfer and the globular 3-D folding of the molecules and are discussed in terms of their implications on the design of efficient redox functional dendrimers.
N. Leventis et al., "Redox-active Star Molecules Incorporating the 4-Benzoylpyridinium Cation: Implications for the Charge Transfer Efficiency along Branches vs. Across the Perimeter in Dendrimers," Journal of American Chemical Society, vol. 126, no. 13, pp. 4094 - 4095, American Chemical Society (ACS), Mar 2004.
The definitive version is available at https://doi.org/10.1021/ja0390247
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© 2004 American Chemical Society (ACS), All rights reserved.
16 Mar 2004