Table 4: Summary of physical and IR spectroscopic data of the 1-(3, 4-dichlorophenyl)-4-(2-aryl-1-diazenyl)-piperazine series (15).

Series #	X	% Crude	M.P. (°C)	Recr. Solv.	Crystal Appearance	IR(cm-1)
15a	p-CN	98	162 - 163	Ethanol	Fibrous Off-white Prisms	OOP C≡N	842 2223
15b	p-CHOCH3	98	155 - 156	Ethanol	Lustrous reddish gold plates	OOP C=O	846 1675
15c	p-Br	55	146 - 147	Ethanol	Light brown needles	OOP	836
15d	p-OCH3	34	131 - 133	Ethanol	Pale pink needles	OOP C-O	837 1034, 1245
15e	p-NO2	53	150 - 151	Ethanol	Small lustrous red Needles	OOP NO2	851 1339, 1595
15f	p-CH3	36	130.3 - 130.9	Ethanol	Small pale pink Needles	OOP	823
15g	3-py	104	Oil	Oil	-	OOP	838
15h	m-CF3	48	Oil	Oil	-	OOP	803