Table 1.

Photochemical data of compounds 2 a/b, 3 a/b, and 4 a/b.^[a]

	λabs [nm]	λem [nm]	ɛ [m−1 cm−1]	Φ
1	526	540	78 000	0.65
2 a	519	531	80 000	0.079
2 b	514	524	87 000	0.36
3 a	518	534	83 000	0.039
3 b	513	527	91 000	0.29
4 a	518	532	79 000	0.042
4 b	512	526	79 000	0.33
5 b	513	528	90 000	0.34
6 b	513	527	64 000	0.28

[a] Determined in THF at room temperature.