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Electron impact mass spectra of polycyclic aromatic compounds with several types of pyridino- and benzobenzanthrone skeletons

✍ Scribed by Zeper Abliz; Junji Aoki; Toyotoshi Ueda; Teruo Kan; Minoru Takekawa; Satoshi Iwashima

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
659 KB
Volume
28
Category
Article
ISSN
1076-5174

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✦ Synopsis

Electron impact mass spectra were measured for five isomers of pyridinobenzanthrones and three isomers of benzobenzanthrones. The fragmentation pattern and intensity of M", [M -HI', [ M -CO]'+, [M -CO -H(or 2H)I" and [ M -CO -HCN]" (i = 1, 2) ions indicated remarkable differences and very interesting features according to the isomers with or without nitrogen and condensation positions of a pyridino or benzo ring to the benzanthrone skeleton. Further, the competition of decompositions through [ M -HI', [M -CO]" or [M -HCN] + * ions was confirmed by the observation of metastable ions and the appearance energies of fragment ions. Interesting observations from these results were expulsion of an H atom in close proximity to the area around an O=C group, a weak bonding interaction between sp2 C-H and an O=C group, inducing specific hydrogen rearrangement, and characteristic charge localization on heteroatoms.

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