New evolution of charge carrier injection into DNA with metal ion incorporation

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We have investigated physical properties of M-DNA, where divalent metal ions M are incorporated into DNA. We found a possibility of charge carrier injection into DNA only in Fe-DNA and freeze-dried Zn-DNA. Fe3+shows both of the high spin and low spin states in Fe-DNA. In the freeze-dried Zn-DNA, where all the water molecules in hydrated Zn2+in Zn-DNA have been removed, Zn2+forms covalent bonds with surrounding nitrogen atoms in the base pair, which gives rise to a creation of the highly correlated p electron spin system. We proposed a model to interpret these interesting behaviors.