Abstract
The electronic states of chemically doped DNA polynucleotides [poly(dG)-poly(dC)] have been studied by photoelectron spectroscopy, x-ray absorption spectroscopy, and Raman spectroscopy, in order to understand the charge conduction mechanism of this material. Upon iodine doping (i.e., hole doping), we clearly observed radical cation formation on DNA bases, and the appearance of additional occupied and unoccupied electronic states within the band gap of poly(dG)-poly(dC). Referring to the analogous studies for $\ensuremath{\pi}$-conjugated conductive polymers, we point out that the charges induced by iodine doping and their derived electronic states are important origins of the hole-conductive electrical properties of poly(dG)-poly(dC).
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