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