Table 4.

Emission maxima and quantum yields of compound 8c and 11c in solvents of different polarity.

Entry	Compound	Solvent	λem, nma	Δλ	Φ
1	8c	THF	504	147	0.56
2		CHCl3	442	76	0.51
3		DMSO	443; 604	80; 241	0.28
4		MeCN	445; 581	85; 221	0.28
5		MeOH	460; 619	96; 255	<0.01
6	11c	THF	449	76	0.74
7		CHCl3	461	88	0.62
8		DMSO	572	196	0.54
9		MeCN	536	166	0.35
10		MeOH	-b	-b	0b

^aCompound 8c was excited at 360 nm and compound 11c at 370 nm. ^bFluorescence was lower than the detection limit.