Coupled cluster and density functional theory studies of the vibrational contribution to the optical rotation of (S)-propylene oxide

Jacob Kongsted, Thomas Bondo Pedersen, Lasse Jensen, Aage E. Hansen, Kurt V. Mikkelsen

Research output: Contribution to journalArticle

63 Scopus citations

Abstract

In a previous study (Chemical Physics Letters 2005, 401, 385) we computed the optical rotatory dispersion of (S)-propylene oxide in gas phase and solution using the hierarchy of coupled cluster models CCS, CC2, CCSD, and CC3. Even for the highly correlated CC3 model combined with a flexible basis set, the theoretical gas-phase specific rotation at 355 nm was found to be negative in contrast to the experimental result. We argued that vibrational contributions could be crucial for obtaining a complete understanding of the experimental result. Here, we show that this indeed is the case by using coupled cluster models and density functional theory methods to calculate the vibrational contributions to the gas-phase specific rotation at 355, 589.3, and 633 nm. While density functional theory (B3LYP and SAOP functionals) overestimates the specific rotation at 355 nm by approximately 1 order of magnitude and yields an incorrect sign at 589.3 and 633 nm, the coupled cluster results are in excellent agreement with the experimentally measured optical rotations. We find that all vibrational modes contribute significantly to the optical rotation and that temperature effects must be taken into account.

Original languageEnglish (US)
Pages (from-to)976-982
Number of pages7
JournalJournal of the American Chemical Society
Volume128
Issue number3
DOIs
StatePublished - Jan 25 2006

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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