Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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2]2+ to Native DNA"> Comparison of the Binding Modes of [Ru(2,2'-bipyridine)3]2+ and [Ru(2,2':6',2"-terpyridine)2]2+ to Native DNA

  • Jang, Yoon-Jung (Department of Chemistry, College Science, Yeungnam University) ;
  • Lee, Hyun-Mee (Department of Chemistry, College Science, Yeungnam University) ;
  • Jang, Kyeung-Joo (Department of Chemistry, College Science, Yeungnam University) ;
  • Lee, Jae-Cheol (Department of Chemistry, College Science, Yeungnam University) ;
  • Kim, Seog-K. (Department of Chemistry, College Science, Yeungnam University) ;
  • Cho, Tae-Sub (Department of Chemistry, College Science, Yeungnam University)
  • Received : 2010.01.19
  • Accepted : 2010.03.16
  • Published : 2010.05.20
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Abstract

The $[Ru(tpy)_2]Cl_2$ (tpy:2,2':6',2"-terpyridine) complex was synthesized and its structure was confirmed by $^1H$-NMR and elemental analysis. Its binding mode toward DNA was compared with the well-known $[Ru(bpy)_3]Cl_2$ (bpy:2,2-bipyridyl), using isotropic absorption, linear dichroism(LD) spectroscopy, and an energy minimization study. Compared to $[Ru(bpy)_3]^{2+}$, the $[Ru(tpy)_2]^{2+}$ complex exhibited very little change in its absorption pattern, especially in the MLCT band, upon binding to DNA. Furthermore, upon DNA binding, both Ru(II) complexes induced a decrease in the LD magnitude in the DNA absorption region. The $[Ru(tpy)_2]^{2+}$ complex produced a strong positive LD signal in the ligand absorption region, which is in contrast with the $[Ru(bpy)_3]^{2+}$ complex. Observed spectral properties led to the conclusion that the interaction between the ligands and DNA bases is negligible for the $[Ru(tpy)_2]^{2+}$ complex, although it formed an adduct with DNA. This conclusion implies that both complexes bind to the surface of DNA, most likely to negatively charged phosphate groups via a simple electrostatic interaction, thereby orienting to exhibit the LD signal. The energy minimization calculation also supported this conclusion.

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References

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