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

Costa, P., Lohmiller, T., Trosien, I., Savitsky, A., Lubitz, W., Fernandez-Oliva, M., et al. (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), 1622-1629. doi:10.1021/jacs.5b11696.

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ja5b11696_si_001.pdf (Supplementary material), 6MB
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Costa, Paolo1, Author
Lohmiller, Thomas1, Author
Trosien, Iris1, Author
Savitsky, Anton2, Author
Lubitz, Wolfgang2, Author
Fernandez-Oliva, Miguel3, Author              
Sanchez-Garcia, Elsa3, Author              
Sander, Wolfram1, Author
Affiliations:
1Lehrstuhl für Organische Chemie II, Ruhr-Universität Bochum, 44780 Bochum, Germany, 44780 Bochum, Germany, ou_persistent22              
2Max-Planck-Institut für Chemische Energiekonversion, 45470 Mülheim an der Ruhr, Germany, ou_persistent22              
3Research Group Sánchez-García, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1950289              

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 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 towards 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 the 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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Language(s): eng - English
 Dates: 2015-11-082016-01-142016-02-10
 Publication Status: Published in print
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/jacs.5b11696
 Degree: -

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Title: Journal of the American Chemical Society
  Other : J. Am. Chem. Soc.
  Abbreviation : JACS
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 138 (5) Sequence Number: - Start / End Page: 1622 - 1629 Identifier: ISSN: 0002-7863
CoNE: https://pure.mpg.de/cone/journals/resource/954925376870