Abstract
Trans–cis photoisomerization is generally described by a model in which the reaction proceeds via a common intermediate having a perpendicular conformation around the rotating bond, irrespective of from which isomer the reaction starts. Nevertheless, such an intermediate has yet to be identified unambiguously, and it is often called the ‘phantom’ state. Here we present the structural identification of the common, perpendicular intermediate of stilbene photoisomerization using ultrafast Raman spectroscopy. Our results reveal ultrafast birth and decay of an identical, short-lived transient that exhibits a vibrational signature characteristic of the perpendicular state upon photoexcitation of the trans and cis forms. In combination with ab initio molecular dynamics simulations, it is shown that the photoexcited trans and cis forms are funnelled off to the ground state through the same, perpendicular intermediate.
This is a preview of subscription content, access via your institution
Access options
Access Nature and 54 other Nature Portfolio journals
Get Nature+, our best-value online-access subscription
$29.99 / 30 days
cancel any time
Subscribe to this journal
Receive 12 print issues and online access
$259.00 per year
only $21.58 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
Data availability
The data supporting the findings of this study are available in the article or Supplementary Information. Source data are provided with this paper. Additional raw data are available from the corresponding author on reasonable request.
References
Hellingwerf, K. J., Hendriks, J. & Gensch, T. Photoactive yellow protein, a new type of photoreceptor protein: will this ‘yellow lab’ bring us where we want to go? J. Phys. Chem. A 107, 1082–1094 (2003).
Rockwell, N. C., Su, Y.-S. & Lagarias, J. C. Phytochrome structure and signaling mechanisms. Annu. Rev. Plant Biol. 57, 837–858 (2006).
Smith, S. O. Structure and activation of the visual pigment rhodopsin. Annu. Rev. Biophys. 39, 309–328 (2010).
Ernst, O. P. et al. Microbial and animal rhodopsins: structures, functions, and molecular mechanisms. Chem. Rev. 114, 126–163 (2014).
Feringa, B. L. & Browne, W. R. Molecular Switches Vol. 42 (Wiley Online Library, 2001).
Balzani, V., Credi, A. & Venturi, M. Photochemical conversion of solar energy. ChemSusChem 1, 26–58 (2008).
Saltiel, J. Perdeuteriostilbene. The role of phantom states in the cis–trans photoisomerization of stilbenes. J. Am. Chem. Soc. 89, 1036–1037 (1967).
Teschke, O., Ippen, E. P. & Holtom, G. R. Picosecond dynamics of the singlet excited state of trans- and cis-stilbene. Chem. Phys. Lett. 52, 233–235 (1977).
Greene, B. I., Hochstrasser, R. M. & Weisman, R. B. Spectroscopic study of the picosecond photoisomerization of stilbene. Chem. Phys. Lett. 62, 427–430 (1979).
Myers, A. B. & Mathies, R. A. Excited-state torsional dynamics of cis-stilbene from resonance Raman intensities. J. Chem. Phys. 81, 1552–1558 (1984).
Abrash, S., Repinec, S. & Hochstrasser, R. M. The viscosity dependence and reaction coordinate for isomerization of cis‐stilbene. J. Chem. Phys. 93, 1041–1053 (1990).
Waldeck, D. H. Photoisomerization dynamics of stilbenes. Chem. Rev. 91, 415–436 (1991).
Saltiel, J., Waller, A. S. & Sears, D. F. The temperature and medium dependencies of cis-stilbene fluorescence. The energetics of twisting in the lowest excited singlet state. J. Am. Chem. Soc. 115, 2453–2465 (1993).
Todd, D. C. & Fleming, G. R. Cis‐stilbene isomerization: temperature dependence and the role of mechanical friction. J. Chem. Phys. 98, 269–279 (1993).
Takeuchi, S. & Tahara, T. Vibrational coherence of S1 trans-stilbene in solution observed by 40-fs-resolved absorption spectroscopy: comparison of the low-frequency vibration appearing in the frequency-domain and time-domain spectroscopies. Chem. Phys. Lett. 326, 430–438 (2000).
Iwata, K., Ozawa, R. & Hamaguchi, H. Analysis of the solvent- and temperature-dependent Raman spectral changes of S1 trans-stilbene and the mechanism of the trans to cis isomerization: dynamic polarization model of vibrational dephasing and the CC double-bond rotation. J. Phys. Chem. A 106, 3614–3620 (2002).
Quenneville, J. & Martínez, T. J. Ab initio study of cis–trans photoisomerization in stilbene and ethylene. J. Phys. Chem. A 107, 829–837 (2003).
Kwok, W. M. et al. Time-resolved resonance Raman study of S1 cis-stilbene and its deuterated isotopomers. J. Raman Spectrosc. 34, 886–891 (2003).
Takeuchi, S. et al. Spectroscopic tracking of structural evolution in ultrafast stilbene photoisomerization. Science 322, 1073–1077 (2008).
Kovalenko, S. A., Dobryakov, A. L., Ioffe, I. & Ernsting, N. P. Evidence for the phantom state in photoinduced cis–trans isomerization of stilbene. Chem. Phys. Lett. 493, 255–258 (2010).
Weigel, A. & Ernsting, N. P. Excited stilbene: intramolecular vibrational redistribution and solvation studied by femtosecond stimulated Raman spectroscopy. J. Phys. Chem. B 114, 7879–7893 (2010).
Minezawa, N. & Gordon, M. S. Photoisomerization of stilbene: a spin-flip density functional theory approach. J. Phys. Chem. A 115, 7901–7911 (2011).
Nakamura, T., Takeuchi, S., Taketsugu, T. & Tahara, T. Femtosecond fluorescence study of the reaction pathways and nature of the reactive S1 state of cis-stilbene. Phys. Chem. Chem. Phys. 14, 6225–6232 (2012).
Tomasello, G., Garavelli, M. & Orlandi, G. Tracking the stilbene photoisomerization in the S1 state using RASSCF. Phys. Chem. Chem. Phys. 15, 19763–19773 (2013).
Harabuchi, Y., Keipert, K., Zahariev, F., Taketsugu, T. & Gordon, M. S. Dynamics simulations with spin-flip time-dependent density functional theory: photoisomerization and photocyclization mechanisms of cis-stilbene in ππ* states. J. Phys. Chem. A 118, 11987–11998 (2014).
Weir, H., Williams, M., Parrish, R. M., Hohenstein, E. G. & Martínez, T. J. Nonadiabatic dynamics of photoexcited cis-stilbene using ab initio multiple spawning. J. Phys. Chem. B 124, 5476–5487 (2020).
Williams, M. et al. Unmasking the cis-stilbene phantom state via vacuum ultraviolet time-resolved photoelectron spectroscopy and ab initio multiple spawning. J. Phys. Chem. Lett. 12, 6363–6369 (2021).
Berndt, F. et al. Long-lived perpendicular conformation in the photoisomerization path of 1,1′-dimethylstilbene and 1,1′-diethylstilbene. Chem. Phys. Lett. 544, 39–42 (2012).
Kukura, P., McCamant, D. W. & Mathies, R. A. Femtosecond stimulated Raman spectroscopy. Annu. Rev. Phys. Chem. 58, 461–488 (2007).
Dietze, D. R. & Mathies, R. A. Femtosecond stimulated Raman spectroscopy. ChemPhysChem 17, 1224–1251 (2016).
Kuramochi, H., Takeuchi, S. & Tahara, T. Ultrafast structural evolution of photoactive yellow protein chromophore revealed by ultraviolet resonance femtosecond stimulated Raman spectroscopy. J. Phys. Chem. Lett. 3, 2025–2029 (2012).
Kuramochi, H., Fujisawa, T., Takeuchi, S. & Tahara, T. Broadband stimulated Raman spectroscopy in the deep ultraviolet region. Chem. Phys. Lett. 683, 543–546 (2017).
Tahara, S., Kuramochi, H., Takeuchi, S. & Tahara, T. Protein dynamics preceding photoisomerization of the retinal chromophore in bacteriorhodopsin revealed by deep-UV femtosecond stimulated Raman spectroscopy. J. Phys. Chem. Lett. 10, 5422–5427 (2019).
Kuramochi, H., Takeuchi, S., Kamikubo, H., Kataoka, M. & Tahara, T. Skeletal structure of the chromophore of photoactive yellow protein in the excited state investigated by ultraviolet femtosecond stimulated Raman spectroscopy. J. Phys. Chem. B 125, 6154–6161 (2021).
Muszkat, K. A. & Fischer, E. Structure, spectra, photochemistry, and thermal reactions of the 4a,4b-dihydrophenanthrenes. J. Chem. Soc. B, 662–678 (1967).
Repinec, S. T., Sension, R. J., Szarka, A. Z. & Hochstrasser, R. M. Femtosecond laser studies of the cis-stilbene photoisomerization reactions: the cis-stilbene to dihydrophenanthrene reaction. J. Phys. Chem. 95, 10380–10385 (1991).
Saltiel, J. & Gupta, S. Photochemistry of the stilbenes in methanol. Trapping the common phantom singlet state. J. Phys. Chem. A 122, 6089–6099 (2018).
Harabuchi, Y. et al. Ab initio molecular dynamics study of the photoreaction of 1,1′-dimethylstilbene upon S0 → S1 excitation. J. Phys. Chem. A 120, 8804–8812 (2016).
Iwamura, M., Watanabe, H., Ishii, K., Takeuchi, S. & Tahara, T. Coherent nuclear dynamics in ultrafast photoinduced structural change of bis(diimine)copper(I) complex. J. Am. Chem. Soc. 133, 7728–7736 (2011).
Maeda, S., Harabuchi, Y., Ono, Y., Taketsugu, T. & Morokuma, K. Intrinsic reaction coordinate: calculation, bifurcation, and automated search. Int. J. Quantum Chem. 115, 258–269 (2015).
Shao, Y., Head-Gordon, M. & Krylov, A. I. The spin–flip approach within time-dependent density functional theory: theory and applications to diradicals. J. Chem. Phys. 118, 4807–4818 (2003).
Schmidt, M. W. et al. General atomic and molecular electronic-structure system. J. Comput. Chem. 14, 1347–1363 (1993).
Maeda, S. et al. Implementation and performance of the artificial force induced reaction method in the GRRM17 program. J. Comput. Chem. 39, 233–250 (2018).
Harabuchi, Y. et al. SPPR, version 2020.1, a homemade program for AIMD simulation (Hokkaido University, 2020).
Werner, H. J. Third-order multireference perturbation theory—the CASPT3 method. Mol. Phys. 89, 645–661 (1996).
Werner, H. J. et al. Molpro, version 2012.1, a package of ab initio programs. Molpro https://www.molpro.net (2012).
Acknowledgements
This work was partly supported by JST, PRESTO grant number JPMJPR17P4 to H.K. and CREST grant number JPMJCR1902 to T. Taketsugu, and JSPS KAKENHI grant numbers JP16H04102 to S.T., and JP25104005 and JP21K18943 to T. Tahara.
Author information
Authors and Affiliations
Contributions
H.K., S.T. and T. Tahara conceived and designed the research. H.K., Z.W., P.K., L.L. and S.T. performed spectroscopic measurements and analysed the data. M.O. synthesized trans- and cis-dimethyl-stilbene and their isotopomers. T. Tsutsumi, K.S. and T. Taketsugu performed theoretical calculations. H.K. and T. Tahara wrote the paper. All authors discussed the results and commented on the manuscript.
Corresponding author
Ethics declarations
Competing interests
The authors declare no competing interests.
Peer review
Peer review information
Nature Chemistry thanks Christopher Elles and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
Additional information
Publisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Extended data
Extended Data Fig. 1 Electronic structure of the perpendicular state.
Potential energy curves for the S0, S1, and S2 states, colored by each dipole moment, at the SF-TDDFT(BHHLYP)/6-31 G(d) level of theory. The behavior of the potential energy of the S1 state changes near (S1)twist, where the dipole moment suddenly increases, indicating that the perpendicular state is a zwitterionic state.
Extended Data Fig. 2 Ultraviolet resonance femtosecond stimulated Raman spectrum of parent cis-stilbene.
UV-FSRS spectrum of parent cis-stilbene in acetonitrile (1 mM) obtained at 1 ps after photoexcitation at 266 nm. The Raman pump wavelength was tuned to 354 nm, which is rigorously resonant with the UV transient absorption band. The UV-FSRS spectrum of cis-dmSB at 1 ps is also shown for comparison. The white-shaded regions are disturbed by the imperfect subtraction of the solvent Raman bands.
Supplementary information
Supplementary Information
Supplementary Figs. 1–13, Sections 1–9 and discussion.
Source data
Source Data Fig. 1
Time-resolved absorption data.
Source Data Fig. 2
Time-resolved Raman data.
Source Data Fig. 3
Time-resolved Raman data of the isotopomers.
Source Data Fig. 4
AIMD simulation data.
Source Data Extended Data Fig. 1
Analysis of the dipole moment along the reaction pathways.
Source Data Extended Data Fig. 2
Time-resolved Raman data of parent stilbene.
Rights and permissions
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
About this article
Cite this article
Kuramochi, H., Tsutsumi, T., Saita, K. et al. Ultrafast Raman observation of the perpendicular intermediate phantom state of stilbene photoisomerization. Nat. Chem. 16, 22–27 (2024). https://doi.org/10.1038/s41557-023-01397-6
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1038/s41557-023-01397-6