Optical properties of selected compounds 4 and 5 in CH₂Cl₂.

4/5	λ abs (nm) (ε (104 M−1 cm−1))	λ em a (nm)	Φ F b (%)	Δνc (cm−1)
4abd	415 (1.73)	565	90	6397
4af	334 (3.05), 422 (1.90)e	572	48	6214
4ag	294 (1.87), 348 (1.04), 370 (1.19)e	512	83	7496
4aq	380 (1.73)	471	20	5085
4as	388 (2.03)	481, 505	23	4983
4at	380 (2.55)	479, 499	39	5439
4au	438 (3.08), 465 (3.78), 490 (2.89)e	548	25	2160
4av	344 (2.0), 385 (1.77)e	540	32	7455
5aa	297 (1.97), 364 (0.81), 382 (0.56)e	425	56	2649
5ab	278 (3.19), 304 (2.78), 438 (1.81)e	533	87	4069
5ac	306 (0.19), 370 (0.11), 395 (0.10)e	446	95	2894

^aExcited at λ_abs.

^bAbsolute fluorescence quantum yields.

^cStokes shifts.

^dThe optical data of 4ab in CH₂Cl₂ was reported by Yamaguchi et al. in ref. 3a.

^eAbsorption maxima at the longest wavelength.