Metal incorporated M-DNA: structure, magnetism, optical absorption

Kenji Mizoguchi

doi:10.1117/12.895941

16 September 2011 Metal incorporated M-DNA: structure, magnetism, optical absorption

Kenji Mizoguchi

Proceedings Volume 8103, Nanobiosystems: Processing, Characterization, and Applications IV; 810307 (2011) https://doi.org/10.1117/12.895941
Event: SPIE NanoScience + Engineering, 2011, San Diego, California, United States

Abstract

DNA is an interesting material from the viewpoint of the materials science. This paper discusses the electronic states of the metal incorporated M-DNA complexes with several species of metal ions. M-DNA prepared by the ordinary methanol precipitation technique has been investigated with ESR, STM and optical absorption, and concluded that the metal ion hydrated with several water molecules locates in between the bases of a base pair and that the divalent metal ions are incorporated into DNA in place of two Na cations as the counter ion for PO^-₄in the DNA backbones. Only in Fe-DNA, it was confirmed that the Fe2+ in the FeCl₂ aqueous solution reacts with DNA to form Fe-DNA complex with Fe³⁺, where the charge would transfer to DNA. Within 30 min, the hydrolysis of Fe²⁺ to form Fe³⁺O(OH) did not occur in the FeCl₂ aqueous solution at room temperature. The optical absorption spectra of Fe-DNA is similar to that for FeCl₃ with the ionic character, but definitely differs from that of Fe³⁺O(OH) with the covalent bonding nature, suggesting the ionic character of Fe³⁺ in Fe-DNA. Finally, the possible two kinds of electronic states for Zn-DNA with different bonding nature will be discussed in relation to the recent report on Zn-DNA.

Citation Download Citation

Kenji Mizoguchi "Metal incorporated M-DNA: structure, magnetism, optical absorption", Proc. SPIE 8103, Nanobiosystems: Processing, Characterization, and Applications IV, 810307 (16 September 2011); https://doi.org/10.1117/12.895941

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