Table 1.

Photophysical properties of chalcone 3a–f (2 µM) in different solvents.

Solvents	Dye	Photophysical Properties
		λabs a (nm)	λem b (nm)	∆λ c (nm)	Φf d (n = 3)	ε e (M−1 cm−1)
DMSO	3a	417	532	115	0.69 ± 0.04	4.6 × 104
	3b	431	560	129	0.34 ± 0.04	3.1 × 104
	3c	413	520	107	0.61 ± 0.04	1.0 × 104
	3d	422	516	94	0.10 ± 0.02	4.6 × 104
	3e	420	539	119	0.50 ± 0.02	3.2 × 104
	3f	412	512	100	0.21 ± 0.03	3.5 × 104
MeOH	3a	417	549	132	0.013 ± 0.006	3.0 × 104
	3b	428	567	139	0.012 ± 0.007	2.9 × 104
	3c	414	546	132	0.017 ± 0.011	1.0 × 104
	3d	423	555	132	0.024 ± 0.015	3.7 × 104
	3e	417	547	130	0.012 ± 0.007	3.2 × 104
	3f	414	549	135	0.027 ± 0.011	3.1 × 104
PBS (3%w/w tween 80)	3a	416	529	113	0.15 ± 0.02	3.3 × 104
	3b	427	520	93	0.11 ± 0.02	3.7 × 104
	3c	411	526	115	0.11 ± 0.02	1.3 × 104
	3d	422	542	120	0.17 ± 0.03	4.4 × 104
	3e	420	521	101	0.18 ± 0.03	2.8 × 104
	3f	412	524	112	0.18 ± 0.02	3.4 × 104

^a λ_abs = absorption maximum wavelength, ^b λ_em = emission maximum wavelength (excited at the maximum absorption wavelength), ^c ∆λ = stokes shifts (λ_em − λ_abs), ^d Φ_f = fluorescence quantum yields calculated by using fluorescein in 0.1 M NaOH as a standard (Φ_f = 0.95). ^e ε = molar absorptivity.