Ultraviolet absorption spectra of pyridine-d(0) and -d(5) and their ring-bending potential energy function in the S(1)(n,pi*) 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,*) electronic excited state. More than a dozen absorption bands associated with the 18 (formerly labeled 16b) bending mode were observed. An energy map for the low-frequency modes was constructed and the data for the 18 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.

published proceedings


author list (cited authors)

  • Boopalachandran, P., & Laane, J.

citation count

  • 17

complete list of authors

  • Boopalachandran, Praveenkumar||Laane, Jaan

publication date

  • September 2008