Table 2. Emission data of porphyrin-azoheteroarene hybrids 4–8 and their corresponding precursors 1–3 recorded in toluene (the concentration used was 1 × 10⁻⁵ M).

Compound	λ em [nm]	Φ f	τ f [ns]	k rad (106 s−1)	k nr (106 s−1)	Stokes shift Qx(0,0) − Q*x(0,0) [cm−1]	E opt [eV]
1	660, 725	0.093	9.35	9.94	97.00	209	1.890
2	671, 729	0.012	1.61	7.45	613.6	294	1.870
3	685	0.093	7.42	12.8	125.3	484	1.845
4	659, 724	0.23	9.63	23.8	79.95	210	1.896
5	668, 728	0.028	1.60	17.5	607.5	251	1.873
6	688	0.084	5.76	14.5	159.02	480	1.839
7	658, 723	0.18	9.91	18.16	82.74	210	1.896
8	669, 729	0.022	1.51	14.56	674.68	251	1.873