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(A) Stern-Volmer plot of TMR-bipy-DNA fluorescence quenching by CuSO4 (closed circles) shows a pronounced negative deviation from the Stern-Volmer law for collisional quenching (solid line) that can be explained using the model from eq. (1) for fitting the data (dashed line). (B) Absorption of TMR-bipy-DNA shows only a very weak dependency on the addition of CuSO4.
