MASS-SPECTRAL FRAGMENTATION STUDIES OF N,N-LINKED BIPYRIDONES UNDER ELECTRON-IMPACT

The mass spectra of seven new NN-linked bipyridones and four of their mono- and dications have been examined at 70 eV. As a general trend th e base ions of the N,N-linked bipyridones (1a-d) and (2a-e) are the pa rent ions whereas the mono- (3a, b) and the dications (4a, b) showed t heir bare ions by loss of chlorine or HCl, HBF4 respectively from the molecular ions. On the other hand the N,N-linked bipyridones were char acterised by the expulsion of two carbon monoxide molecules. The corre sponding monocations were distinguished by hydrogen radical eliminatio n prior to the elimination of carbon monoxide. The analogous dication underwent fragmentation via elimination of a couple of hydrogen radica l before elimination of two carbon monoxide molecules.