The electrochemical behavior ofa naphthalene diimide derivative carrying two ferrocene moieties at the termhli of its imide nitrogens1(Scheme1)was studied by cychc voltammetry(CV)oglassy carbonnd gold electrodesThe compounds representing its structural prtsthe one carrying only naphthalene diimide part2nd the other carrying onlyrrocene part3were also stu(1iedor reference CV measurements of l dinot reveal clear-cut interactions between the naphthalene diimide and theocene partswhile a spectrophotometry suggested an intramolecular stacking interactionsOn the hairpin(SP-A5)DNA-immobihzed gold electrodethe crent at550mV increased(1ramaticay whereas the current on the double stranded DNA-immobilized gold electrode (after hybhdization of HP-T5to SHPA50n the electrode)decreased This indicates the preerential binding of l molecules with the hairpin DNA on tke electrodeWe fbresee an application of this phenomenon as a new strategy for the detection of unusual structures in DNA such as that in hairpin DNA
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Takenaka et al. (1998) studied this question.
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