Abstract
Ferrocene-labeled DNA systems where the Fc group is directly attached to deoxyuridine are investigated electrochemically in an effort to elucidate the electron transfer properties of these systems. The rigid linkage between the Fc group and the nucleobase provides control over the position of the Fc group within the ds-DNA and helps to elucidate the effect of the position of the redox label on the electrochemical behaviour of the ds-DNA films. Cyclic voltammetry, electrochemical surface plasmon resonance and scanning electrochemical microscopy measurements show that charge transfer (CT) in such systems is to a large extent controlled by the dynamic properties of surface-bound ds-DNA rather than by the CT through base-pair stacks.
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