Abstract
Interaction of lanthanide(III) texaphyrins (LnTEX) with calf thymus DNA was studied by UV–Vis, CD, resonance light scattering spectroscopy and by laser flash photolysis. The thermal stability of the LnTEX/DNA complexes decreases with the increasing lanthanide ion radius: LuTEX > DyTEX > GdTEX > EuTEX > CeTEX ⩾ LaTEX. Texaphyrins LaTEX, LuTEX and GdTEX produce O 2( 1 Δ g) in methanol solutions. In a phosphate buffer, the concentration of O 2( 1 Δ g) produced by these texaphyrins bound to DNA is affected by the formation of aggregates on the DNA backbone.
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