The infrared spectra of solid, liquid and gaseous pyridine-N-oxide are reported, together with the Raman spectrum of the liquid. A complete vibrational assignment is proposed, based on gas-phase band contours, depolarization ratios of Raman lines, and comparison with the spectra of pyridine and monosubstituted benzenes. The vibration spectrum of pyridine-N-oxide shows a striking similarity with those of the isoelectronic and nearly isobaric molecules fluorobenzene and phenol. There is no true NO stretching frequency: three A1 vibrations, at 1252, 837 and 544 cm—1, all involve considerable NO stretching. Similarly two B2 vibrations, at 512 and 226 cm—1, both involve some NO out-of-plane bending. The NO in-plane bending mode falls at 468 cm-1. The NO bond of pyridine-N-oxide has essentially the same character as the CO bond of phenol.
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Con il contributo del Ministero per i Beni e le Attività Culturali