Synthesis and Characterization of a Series of 1-Aryl-4-[Aryldiazenyl]-piperazines. Part II1. 1-Aryl-4-(2-Aryl-1-Diazenyl)-piperazines with Fluoro-, chloro-, Methyl-, Cyano- and Acetyl Substituents in The 1-Aryl Group

Table 14: Summary of mass spectroscopic data of the 1-(2-pyridyl)-4-(2-aryl-1-diazenyl)-piperazine series (18).

Series #	X	Formula	Calc. Mass (amu)	Found Mass (amu)
18a	p-NO₂	C₁₇H₁₉N₅O₂	312.1334	312.1339
18b	p-CN	C₁₆H₁₆N₆	292.1436	292.1431
18c	3-py	C₁₄H₁₆N₆	268.1436	268.1438
18d	p-CO₂CH₃	C₁₇H₁₉N₅O₂	325.1538	325.1538
18e	p-COCH₃	C₁₇H₁₉N₅O	309.1589	309.1600
18f	p-CH₃	C₁₆H₁₉N₅	281.1640	281.1629
18g	o-Br	C₁₅H₁₆N₅Br	345.0589	345.0588
18h	H	C₁₅H₁₇N₅	267.1484	267.1495