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Long time scale transient absorption and anisotropy of 1 (A) and 2 (B) bound to DNA (mixed-sequence calf thymus DNA). Short time scale traces (up to t = 20 ps, not shown) were included in the global fitting of the time constants shown. The samples contained 75 μM Ru(phen)2dppz subunits and 1.5 mM DNA bases in 5 mM phosphate (pH 7) and 50 mM NaCl aqueous solution. The pump wavelength was 502 ± 2 nm. The probe wavelengths and time constants are indicated.
