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Substituted dipyridophenazine complexes of Cr(iii): Synthesis, enantiomeric resolution and binding interactions with calf thymus DNA

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Published
  • Suni Vasudevan
  • Jayden A. Smith
  • Michal Wojdyla
  • Thomas McCabe
  • Nicholas C. Fletcher
  • Susan J. Quinn
  • John M. Kelly
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<mark>Journal publication date</mark>28/04/2010
<mark>Journal</mark>Dalton Transactions
Issue number16
Volume39
Number of pages9
Pages (from-to)3990-3998
Publication StatusPublished
<mark>Original language</mark>English

Abstract

[Cr(phen)2(X2dppz)]3+ {X = H, Me, or F} have been synthesised, characterised, and chromatographically resolved into their constituent Δ and Λ enantiomers. The DNA-binding interactions of each of the racemic complexes were investigated, with the results of linear dichroism, thermal denaturation, and emission quenching studies indicative of intercalative binding to CT-DNA with a significant electrostatic contribution. UV/Vis absorption titrations suggest strong DNA binding by each of the racemic complexes, with the methylated analogue [Cr(phen)2(Me 2dppz)]3+ exhibiting the largest equilibrium binding constant. Emission quenching and UV-Vis titrations of the enantiomers of [Cr(phen)2(dppz)]3+ imply similar binding affinities for the Δ and Λ isomers, although significant differences between the circular dichroism spectra of the enantiomers in the presence of DNA connote differences in binding orientation and/or conformation between the two.