Abstract

The action mode between Dy(III)(NR)<sub>3</sub> and herring sperm DNA is studied by ultraviolet-visible (UV-vis) and fluorescence spectra as well as electrochemistry. Double-reciprocal method studies show that the binding stoichiometry between Dy(III)(NR)<sub>3</sub> and DNA is 1:1, the binding constants at different temperatures are 1.15×10<sup>5</sup> L/mol at 25 °C and 2.09×10<sup>5</sup> L/mol at 35 °C, and the corresponding thermodynamic parameters are Δ<sub>r</sub>H <sup>Θ</sup><sub>m</sub> = 2.48×10<sup>4</sup> J/mol, Δ<sub>r</sub>G <sup>Θ</sup><sub>m</sub> =-2.34×10<sup>4</sup> J/mol, Δ<sub>r</sub>Sm=161.7 J/(mol·K); Δ<sub>r</sub>S <sup>Θ</sup><sub>m</sub> is the driving force in this reaction. Combined with Scatchard method and melting method, the results suggest that the interaction mode between Dy(III)(NR)<sub>3</sub> and herring sperm DNA is intercalation fashion and groove fashion.

© 2010 Chinese Optics Letters

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