Spectroscopic data of a series of 5-N-arylaminothiazoles^a.

Thiazole	λ abs (nm)	log ε	λ ex (nm)	λ em b (nm)	ν ss [cm−1] (nm)	φ F c
4a	349	4.14	359	467	[7240] (118)	0.04
4b	398	3.90	397	525	[60781] (127)	0.13
4c	391	4.05	395	514	[61201] (123)	0.16
4d	381	4.03	377	486	[56701] (113)	0.2
4e	374	3.92	376	476	[5729] (102)	0.31
4f	396	3.72	392	505	[5450] (109)	0.42
6a	371	4.44	—	—	—	—
6b	372	4.50	—	—	—	—

^aIn chloroform [conc. = 10⁻⁵ M].

^bExcited in λ_max.

^cAbsolute quantum yield of fluorescence.