UV-visible absorption maxima of EN in different solvents^a.

Solvent	λ max (nm)	ε (104 L mol−1 cm−1)		Abs. range (nmonset)	BG* range (eV)	E H–L (eV), (calculated)
EtOH	350	4.33	3.54	305–412	4.07–3.01	3.67
MeOH	350	5.33	3.54	300–412	4.07–3.01
CH3CN	—	—	—	—	—	—
THF	342	3.81	3.63	290–405	4.28–3.06	3.58
CHCl3	353	8.35	3.51	306–419	4.05–2.95
CH3CHOHCH3	350	4.33	3.54	305–412	4.07–3.01
CCl4	364	7.97	3.41	314–450	3.95–2.76
DMSO	353	4.33	3.51	308–437	4.02–2.84	3.61
DMF	319, 403	1.52, 0.50	3.89, 3.07	300–385, 403	4.07–3.22, 3.07	3.61
C6H5CH3	356	3.79	3.48	290–425	4.28–2.91	3.49

^aBG* signifies band gap.