Electronic properties and ultraviolet absorption and fluorescence spectra of 2,6-pyridinediamine

Article abstract of DOI:10.1016/0584-8539(88)80225-3

The u.v. absorption and fluorescence spectra of 2,6-pyridinediamine and its carboxylate salts were measured in various solvents at room teemperature and 77K.These spectral data were interpreted by molecular orbital method.From these results it was found that the formation of 6-amino-2(H)-pyridinimine through the 2,6-pyridinediamine hydrogen bonded compex with ethanol occurs only in the ?,?* excited singlet state in the ethanol and isooctane mixed solvent.On the other hand, the fluorescence spectrum of 2,6-pyridinediamine in the pH > 13 controlled solution was assigned to the monoanion species, that is, the 6-amino-2-pyridylamide ion which was formed in the first ?,?* excited singlet state.