Table 2. Selected absorption maxima, fluorescence quantum yields, emission maxima and Stokes shifts.

Compound	λ abs  a (nm)	Φ FL  b (%)	λ em (nm)	Stokes shiftc (nm)
14	344, 477	12.1	496	19
15a	351, 477	1.3	506	29
15b	353, 479	0.9	508	(29)
15c	348, 479	0.7	508	(29)
15d	353, 479	6.4	502	23
15e	353, 479	20.4	508	29
15f	350, 477	11.6	500	23
15g	350, 479	11.1	502	23
20	336, 396	0.2	508	(112)
21	332, 410	0.2	508	(96)
23	340, 423	0.4	508	(85)
26	317, 373	1.2	508	135
28	334, 423	0.1	508	(85)
32	337, 421	0.6	508	(87)

^aAbsorption maxima given are the most intense and the longest wavelength.

^bQuantum yields were calculated by integrating the emission peaks 450–610 nm.

^cFigures in parentheses for compounds with Φ_FL < 1%.