Photophysical properties of the synthesized azodye derivatives 3a–o.

Azodyes	Absorptiona, λmax/abs (nm)	ε max (M−1 cm−1)	Emissionb, λmax/em (nm)	Stokes shiftsc (nm)
3a	475	20 569	551	76
3b	472	30 036	549	77
			709	237
3f	476	30 432	552	76
3i	475	22 908	549	74
3j	476	25 639	553	77
3m	444	12 852	513	69
3o	494	240 212	576	82

^aDetermined in acetone at room temperature when the concentration of each compound is 1.0 × 10⁻⁵ M.

^bExcited at the longest wavelength of the absorption maxima.

^cStokes shifts are provided as wavelength differences, Δλ_max = λ_max(em) − λ_max(ex).