Table 1. Summary of the photophysical data for DB1 and DB2.

	DB1	DB2
λ abs (nm, PBS)	507	470
λ em (nm, PBS)	534	537
λ abs (nm, DMSO)	531	464
ε (M−1 cm−1, DMSO)a	123 000	39 000
Φ f (PBS)	0.26 ± 0.01	0.024 ± 0.002
Φ Δ (PBS)	0.38 ± 0.04	0.20 ± 0.02

^aExtinction coefficients were determined at the respective maximum λ_abs in DMSO.