Table 1.

Photophysical properties of the final compounds measured in DCM, if not stated otherwise.

Compound	λmax,abs [nm][a]	λmax,em [nm][b]	Stokes Shift [cm−1]	QY [%][c]	λonset,abs [nm]	Eg(opt) [eV][d]	Eg(calc) [eV][e]
2 a	424/424[f]/424[g]	454/451[f]/443[g]/483[h]	1558/1412[f]/1012[g]	79/76[f]/57[g]	446	2.78	3.48
2 b	432	464	1596	70	458	2.71	‐
2 c	425	454	1503	90	446	2.78	‐
2 d	428	460	1625	72	451	2.75	‐
2 e	432	463	1550	42	461	2.69	‐
2 f	403/402[f]/405[g]	–[i]/–[f],[i]/482[g]/–[h],[i]	3944[g]	8[g]	526	2.36	2.70
2 g	436	471	1704	37	462	2.68	‐
2 h	418	443	1350	52	438	2.83	3.50
2 i	425	453	1454	68	449	2.76	‐
2 j	426	454	1448	85	450	2.76	‐
2 k	423	451	1468	70	446	2.78	‐
2 l	424	446	1163	58	447	2.77	‐
2 m	427	478	2499	69	458	2.71	‐
2 n	425	458	1695	60	449	2.76	‐
2 o	440	469	1405	72	463	2.68	3.38
2 p	443	474	1476	77	468	2.65	‐
2 q	434	459	1255	75	456	2.72	‐
2 r	417	433	886	74	433	2.86	3.60
4	447	473	1230	34	469	2.64	‐
6	436	543	4520	38	506	2.45	2.96
8	423	471	2409	66	455	2.72	3.17
12	407	487	4036	40	460	2.70	3.41

[a] Maximum of the longest absorption wavelength. [b] Maximum of the shortest emission wavelength. [c] Fluorescence quantum yield. [d] Optical gap estimated from λ_onset,abs: E_g(opt)=1239.8/λ_onset,abs. [e] HOMO‐LUMO gap values computed by DFT, see Supporting Information. [f] In 1,4‐dioxane. [g] In cyclohexane. [h] As powder. [i] No fluorescence observed.