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1D and 2D 1H NMR spectroscopy (500 MHz) was used to study heteroassociation of the bifunctional intercalator ethidium homodimer (EBH) with a phenanthridine dye propidium iodide (PI) in an aqueous salt (0.1 mol/l NaCl). A physical model of equilibrium between various associated forms of ethidium homodimer and propidium in solution is suggested, the most probable forms being 1:1 and 1:2 complexes of...
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