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Electronic spectrum of 2,6-naphthyridine: A case for two n, π* states

✍ Scribed by Gad Fischer; I.G. Ross; M. Puza

Publisher
Elsevier Science
Year
1982
Tongue
English
Weight
542 KB
Volume
38
Category
Article
ISSN
1386-1425

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✦ Synopsis

The vibrational spectrum of 2,6-naphthyridine (point group C2h) has been measured; the fundamentals are assigned. The electronic spectrum is recorded to 210 nm in solution, and the first two absorption regions studied in further detail. The first transition (onset 400 nm) is very weak (f-1.5 x 10-5), and is assigned as a forbidden Bg*--A~ 1r**--n, transition as predicted by theory. Its spectrum in naphthalene host shows uniform polarization, parallel to the shorter in-plane molecular axis. The second absorption region at 330 nm contains the first 7r**--~r system (B,*-As). In the vapor it shows a sparsely "tangled" spectrum indicative of a resonance between the ~r, zr* and some other state of only slightly lower energy. The complexities due to this resonance are not seen in durene host crystal. We conclude that a second n,~r* state (A~) lies just below the first ~r,~r* state in the vapor, and that these two states reverse their order in durene.

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