✦ LIBER ✦

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

✍ Scribed by Akira Fujimoto; Kozo Inuzuka

Publisher: Elsevier Science
Year: 1988
Tongue: English
Weight: 757 KB
Volume: 44
Category: Article
ISSN: 1386-1425
DOI: 10.1016/0584-8539(88)80225-3

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✦ Synopsis

The u.v. absorption and fluorescence spectra of 2,6_pyridinediamine and its carboxylate salts were measured in various solvents [isooctane (2,2,4_trimethylpentane), methylcyclohexane and isopentane mixed solvent, ethanol and isooctane mixed solvent, and pH adjusted solvent] at room temperature and 77 K. These spectral data were interpreted by the molecular orbital method. From these results it was found that the formation of 6-amino-2( 1 H)-pyridinimine through the 2,6_pyridinediamine hydrogen bonded complex with ethanol occurs only in the n.x* 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 K,Z* excited singlet state.

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