Figure 6: Structure and oscillation intensity of the 1-phenylpyrene pair.

(a) Structure of the PP pair contained in the model shown in Fig. 3c. The intersecting angle between the two pyrene planes is 67°. (b) Oscillator strength versus electronic transition energies for the PP pair. The experimental UV-visible absorption spectrum of Py-1-SWNT, as depicted in Fig. 2, is shown for comparison.