Rotation and isomerization of diphenylbutadiene and 4-(methanol)stilbene in supercritical (CO2 - A re-examination

R. Biswas, K. Dahl, M. Maroncelli

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8 Scopus citations

Abstract

The rates of excited-state rotation and isomerization of trans,trans-1,4-diphenylbutadiene (DPB) and 4-(methanol)stilbene (HMS) in supercritical CO2 (T = 36 °C, ρ = 0.4-2ρc) were measured using time-resolved emission methods. These measurements were prompted by a discrepancy between rotation times recently simulated for these systems (Patel, N.; Biswas, R.; Maroncelli, M. J. Phys. Chem. B 2002, 106, 3306-3318) and earlier experimental results. The present data show the rotation times of the two solutes to be approximately equal and linear functions of (bulk) solvent density, consistent with the simulations. The rate of isomerization of HMS decreases approximately linearly with solvent density, whereas the isomerization of DPB is remarkably insensitive to density.

Original languageEnglish (US)
Pages (from-to)11593-11595
Number of pages3
JournalJournal of Physical Chemistry B
Volume106
Issue number44
DOIs
StatePublished - Nov 7 2002

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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