“…These assignments align well with the infrared absorption spectra of pyridine in a neon matrix and pyridine derivatives in the gas phase. [45][46][47] The absorption bands of group B are attributed to various vibrational modes of the Z 2 -(1,4) p adduct B(C 5 H 5 N). Six bands were detected at 1131.1, 1010.4, 891.2, 858.2, 796.4, and 789.6 cm À1 .…”