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