Table 3.

Photophysical properties of 4a,b and 4e–g in dichloromethane solutions.

	Emission				Absorption
	λem (nm)	FWHMa	Φfluob	ν̃ stokesc	λabs (nm )	log ε	λonset (nm)	Egopt (eV)d
4a	386 400	48	0.11	2400	346 365	4.83 4.71	389	3.18
4b	394 406	55	0.10	4100	311 348	5.10 4.85	406	3.05
4e	382 398	50	0.14	2600	343 361	5.08 4.98	385	3.22
4f	380 396	50	0.11	2400	339 362	5.11 4.98	387	3.20
4g	426	66	0.20	4300	321 360	4.96 4.73	415	2.98

^aSpectrum full width at half maximum. ^bFluorescence standard: quinine bisulfate in 1 N H₂SO₄ (Φ_fluo= 0.54) [70]. ^cStokes shift in wavenumber (cm⁻¹) = (1/λ_abs^max − 1/λ_em^max ) 10⁷. ^dEstimated from the onset point of the absorption spectra: E_g^opt = 1240/λ_onset [71].