Ultraviolet absorption spectra of pyridine-d0 and -d5 and their ring-bending potential energy function in the S1(n,π∗) state Academic Article uri icon


  • The ultraviolet absorption spectra of both pyridine and its pyridine-d5 isotopomer have been recorded and assigned with a focus on the low-frequency vibrational modes in the S1(n,π*) electronic excited state. More than a dozen absorption bands associated with the ν18 (formerly labeled ν16b) bending mode were observed. An energy map for the low-frequency modes was constructed and the data for the ν18 mode allowed a highly anharmonic one-dimensional potential energy function to be determined for the S1 excited state. In this state pyridine is quasi-planar and very floppy with a barrier to planarity of 3 cm-1. © 2008 Elsevier B.V. All rights reserved.

author list (cited authors)

  • Boopalachandran, P., & Laane, J

complete list of authors

  • Boopalachandran, Praveenkumar||Laane, Jaan

publication date

  • January 1, 2008 11:11 AM