Prediction of cathodic E1/21 and E1/22 values for viologen-containing conjugated unimers and dimers from calculated pKb values of the aromatic substituents |
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| Authors: | Long Chen František Hartl Howard M. Colquhoun Barnaby W. Greenland |
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| Affiliation: | 1. Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, UK;2. Reading School of Pharmacy, University of Reading, Whiteknights, Reading RG6 6AH, UK |
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| Abstract: | A library of 18 conjugated, rod-like compounds with either one or two viologen residues were synthesized and characterized electrochemically. Containing up to 8 aromatic/heterocyclic rings in conjugation, the members of the library differ in the substitution pattern of electron-withdrawing or -donating groups on the aromatic substituents of the viologen units. The first and second half-wave potentials of each member were found to be linearly correlated with the calculated pKb values of the aromatic end-groups. This relationship will enable the half-wave potentials of related, novel, substituted viologen species to be predicted using a simple, empirical formula. |
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| Keywords: | Viologen Synthesis Electrochemistry Conjugated systems Supramolecular Reduction potential |
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