On the temperature-dependent isomerization of all-trans1,6-diphenyl-1,3,5-hexatriene in solution: a reappraisal
Entity
UAM. Departamento de Química Física AplicadaPublisher
WileyDate
2022-02-21Citation
10.1002/poc.4336
Journal of Physical Organic Chemistry 35.6 (2022): e4336
ISSN
0894-3230 (print); 1099-1395 (online)DOI
10.1002/poc.4336Editor's Version
https://doi.org/10.1002/poc.4336Subjects
Cis-peak; Isomerization to s-cis-DPH; Wavenumber shift; QuímicaRights
© 2022 The AuthorsEsta obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional.
Abstract
In this work, we present absorption, emission, and excitation of emission spectra
of all-trans-DPH obtained in solution between 77 and 363 K. The analysis of these
spectra allows to evaluate that this molecular probe, widely used in biophysics,
does not isomerizes in solution to s-cis-DPH at the temperatures explored. These
results are in contradiction to those reported by previous studies that emphasize
that (a) all-trans-DPH isomerizes to s-cis-DPH when dissolved and the temperature ranges from 283 to 373 K and (b) the molar fraction of s-cis-conformer
equals, or even exceeds, the molar fraction of the all-trans-conformer at the
highest temperature studied. In this work, we show how we can infer the changes
taking place in the molecular structure of DPH looking at the wavenumber (ν)
shift of the peaks on the absorption and emission spectra as a function of temperature. The analysis of these band shifts allows us to corroborate the change,
determined by Ogawa et al. by X-ray diffraction, that occurs in the structure of
DPH in the crystalline phase through a bicycle pedal process with temperature
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Google Scholar:Catalán Sierra, Francisco Javier