Figure 2.

(A) Emission spectra collected for cluster bound to C₃AC₃AC₃GC₃A, with the vertical line depicting the emission maximum. (B) Emission spectra for the clusters conjugated with G–S_A before (black) and after (red) exchange of S_B^s-TG₃ with S_B. The vertical line has the same spectral position as the emission maximum in (A), and this spectral similarity between the G and G–S_A/S_B bound clusters indicates their comparable environments. A two- to three-fold enhancement in the emission was determined from multiple measurements with different sample preparations. (C) Relative enhancement of the near infrared emission when increasing amounts of S_B are added to the cluster conjugate of G–S_A/S_B^s-TG₃. The plateau in the fluorescence intensity indicates saturation of the recognition site through hybridization with the complementary sequence.