STRUCTURAL-ANALYSIS OF CONDENSED POLYCYCL IC AROMATIC-COMPOUNDS BY TANDEM MASS-SPECTROMETRY

The fragmentation mechanism of four isomers of pyridino anti benzobenz anthrones was investigated by (EI) tandem mass spectrometry (MS/MS). T he relationship between fragmentation pathways and structural characte ristics was also discussed, Initial fragmentation pathways have been e stimated by the intensities of fragmemt ions [M - H](+), [M - HCN](+), [M - COH](+), [M - CO](2+), [M - (CO + 2H)](i+) and [M - (CO + HCN)]( i+) produced from M(i+) (i = 1,2), They indicated remarkable, differen ces and very interesting features depending upon the isomer's componen t with or without nitrogen, and also the condensation positions oi a p yridino or benzo ring to the benzanthrone skeleton, The collision-indu ced dissociation(CID) spectra bf M(2+) ion showed more effectively spe cific differentiation for their fragmentation behaviors reflecting the structural characteristics of these isomers.