Open Access  Subscription Access

The electron ionization (EI) and ammonia chemical ionization [CI (NH₃)] mass spectral studies on 2-phenyl acetophenone semicarbazone are reported. The El spectrum shows a clearly identifiable molecular ion peak of weak intensity at m/z 253 and the base peak is observed at m/z 77. The CI (NH₃) spectrum is characterized by strong MH+ signal at m/z 254.corresponding to the base peak. The primary fragmentations of significance include the loss of NH₃, H₂NCO, H₂NCONH, H₂NCONHN and C₆H₅CH₂. Fragmentation processes are discussed and rationalized.


KEY WORDS: 2-phenyl acetophenone, semicarbazone, electron ionization, chemical ionization, fragmentation.


Global Jnl Pure & Applied Sciences Vol.10(1) 2004: 81-85