Hetarylazopyrazolone Dyes Based on Benzothiazole and Benzimidazole Ring Systems: Synthesis, Spectroscopic Investigation, and Computational Study

Table 7

The maximum absorption wavelengths (nm) of dyes at different temperature and concentration in chloroform and DMF.

Dye number	Chloroform			DMF
	Concentrated	Concentrated	Diluted	Concentrated	Concentrated	Diluted
	(25°C)	(40°C)	(25°C)	(25°C)	(40°C)	(25°C)
3a	419	417	418	470	468	467
3b	421	420	422	469	469	469
3c	450	450	450	469	469	469
3d	450	449	450	469	469	469
3e	452	452	452	452	452	453
3f	464	464	463	457	457	459