Knowledge Bank

Fundamental vibrational frequencies of the ground state of 1,5-naphthyridine are assigned. A normal coordinate analysis was performed to test the assignments. The electronic spectrum of 1,5-naphthyridine vapor was obtained. $A \Pi^ * \leftarrow n $ transition having an origin at 27 785 $cm-1$ appears to be superimposed on a continuum. A long progression in $522cm-1$ is assigned together with other vibronic bands and sequences in 9.5, 14.5, and $40cm-1$. Present address of Newton M. Perrins: Division of Laboratories and Research, New York State Department of Health, Albany, New York 12201