Table 3. Optical Properties of Compounds (3a–v).

	λmax,ab (nm)		λmax,em (nm)		Stokes shifte (cm–1)		quantum yield
entry	sola	TFb	sola,c	TFb,d	sola	TFb	(ΦF)f
3a	494	508	553	590	2160	2736	0.54
3b	498	511	559	585	2191	2475	0.43
3c	500	514	572	604	2517	2899	0.48
3d	490	504	544	619	2026	3686	0.35
3e	489	496	540	565	1931	2462	0.37
3f	488	501	539	565	1939	2261	0.39
3h	486	498	538	566	1989	2412	0.32
3i	495	497	554	566	2151	2453	0.45
3j	497	550	563	599	2359	1487	0.41
3k	501	527	563	579	2198	1704	0.47
3l	499	503	563	581	2278	2669	0.52
3m	503	510	567	588	2244	2601	0.65
3n	491	503	544	573	1984	2429	0.37
3o	518	529	580	616	2064	2670	0.12
3p	507	521	559	607	1835	2719	0.86
3q	503	509	551	582	1732	2464	0.23
3r	516	525	568	599	1774	2353	0.37
3s	501	512	594	630	3125	3658	0.17
3t	431	435	545	580	4853	5747	0.52
3u	526	532	609	640	2591	3172	0.28
3v	511	540	632	637	3747	2820	0.22

^aSol—in DCM solvent at 5 μM.

^bTF—thin-film.

^cExcitation wavelength: 450–500 nm.

^dExcitation wavelength: 450–540 nm.

^eStokes shift = λ_max,ab – λ_max,em (cm^–1).

^fDetermined by fluorescein (Φ_F = 0.79), as a standard in 0.1 M ethanol solution.