Fig. 4. Time-resolved fluorescence spectra recorded every 0.3 ns (upper to lower; 0.45–0.55, 0.75–0.85, 1.05–1.15, 1.35–1.45, 1.65–1.75, and 1.95–2.05 ns) and fluorescence decay profiles of the double-strands (12)2 at [12] = 5.5 × 10–6 M (A and B) and (13)2 at [13] = 6.9 × 10–6 M (C and D) in toluene. The fluorescence decay profiles (black lines) are shown with fitted curves based on the biexponential decay constants (red lines, τ shown in Table 2) in the range of 623–773 nm.
