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Prediction of cathodic E1 and E2 values for viologen-containing 1/2 1/2 conjugated unimers and dimers from calculated pKb values of the aromatic substituents
journal contributionposted on 2023-06-09, 12:01 authored by Long Chen, Franti Hartl, Howard Colquhoun, Barnaby GreenlandBarnaby Greenland
A library of 18 conjugated, rod-like compounds with either one or two viologen residues were synthe- sized 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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