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Costa P, Lohmiller T, Trosien I, et al. Light and Temperature Control of the Spin State of Bis(p-methoxyphenyl)carbene: A Magnetically Bistable Carbene. J Am Chem Soc. 2016;138(5):1622-9doi: 10.1021/jacs.5b11696.
Costa, P., Lohmiller, T., Trosien, I., Savitsky, A., Lubitz, W., Fernandez-Oliva, M., Sanchez-Garcia, E., & Sander, W. (2016). Light and Temperature Control of the Spin State of Bis(p-methoxyphenyl)carbene: A Magnetically Bistable Carbene. Journal of the American Chemical Society, 138(5), 1622-9. https://doi.org/10.1021/jacs.5b11696
Costa, Paolo, et al. "Light and Temperature Control of the Spin State of Bis(p-methoxyphenyl)carbene: A Magnetically Bistable Carbene." Journal of the American Chemical Society vol. 138,5 (2016): 1622-9. doi: https://doi.org/10.1021/jacs.5b11696
Costa P, Lohmiller T, Trosien I, Savitsky A, Lubitz W, Fernandez-Oliva M, Sanchez-Garcia E, Sander W. Light and Temperature Control of the Spin State of Bis(p-methoxyphenyl)carbene: A Magnetically Bistable Carbene. J Am Chem Soc. 2016 Feb 10;138(5):1622-9. doi: 10.1021/jacs.5b11696. Epub 2016 Jan 27. PMID: 26771052.
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J Am Chem Soc. 2016 Feb 10;138(5):1622-9. doi: 10.1021/jacs.5b11696. Epub 2016 Jan 27.

Light and Temperature Control of the Spin State of Bis(p-methoxyphenyl)carbene: A Magnetically Bistable Carbene.

Journal of the American Chemical Society

Paolo Costa, Thomas Lohmiller, Iris Trosien, Anton Savitsky, Wolfgang Lubitz, Miguel Fernandez-Oliva, Elsa Sanchez-Garcia, Wolfram Sander

Affiliations

  1. Lehrstuhl für Organische Chemie II, Ruhr-Universität Bochum , 44780 Bochum, Germany.
  2. Max-Planck-Institut für Chemische Energiekonversion , 45470 Mülheim an der Ruhr, Germany.
  3. Max-Planck-Institut für Kohlenforschung , 45470 Mülheim an der Ruhr, Germany.

PMID: 26771052 DOI: 10.1021/jacs.5b11696

Abstract

Bis(p-methoxyphenyl)carbene is the first carbene that at cryogenic temperatures can be isolated in both its lowest energy singlet and triplet states. At 3 K, both states coexist indefinitely under these conditions. The carbene is investigated in argon matrices by IR, UV-vis, and X-band EPR spectroscopy and in MTHF glasses by W-band EPR and Q-band ENDOR spectroscopy. UV (365 nm) irradiation of the system results in formation of predominantly the triplet carbene, whereas visible (450 nm) light shifts the photostationary equilibrium toward the singlet state. Upon annealing at higher temperatures (>10 K), the triplet is converted to the singlet; however, cooling back to 3 K does not restore the triplet. Therefore, depending on matrix temperature and irradiation conditions, matrices containing predominantly the triplet or singlet carbene can be generated. Controlling the magnetic and chemical properties of carbenes by using light of different wavelengths might be of general interest for applications such as information storage and radical-initiated polymerization processes.

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