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          Institute: MPI für bioanorganische Chemie     Collection: MPI für bioanorganische Chemie     Display Documents



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ID: 715710.0, MPI für bioanorganische Chemie / MPI für bioanorganische Chemie
Light and Temperature Control of the Spin State of Bis(p-methoxyphenyl)carbene: A Magnetically Bistable Carbene
Authors:Costa, Paolo; Lohmiller, Thomas; Trosien, Iris; Savitsky, Anton; Lubitz, Wolfgang; Fernandez-Oliva, Miguel; Sanchez-Garcia, Elsa; Sander, Wolfgang
Language:English
Date of Publication (YYYY-MM-DD):2016
Title of Journal:Journal of the American Chemical Society
Journal Abbrev.:J. Am. Chem. Soc.
Volume:138
Issue / Number:5
Start Page:1622
End Page:1629
Review Status:Internal review
Audience:Experts Only
Abstract / Description: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 bin) 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.
Comment of the Author/Creator:Date: 2016, FEB 10 2016
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für bioanorganische Chemie
External Affiliations:[Costa,P.; Lohmiller,T.; Trosien,I.; Sander,W. ] Ruhr Univ Bochum, Lehrstuhl Organ Chem 2, D-44780 Bochum, Germany
[Fernandez-Oliva,M.; Sanchez-Garcia,E.] Max Planck Inst Kohlenforsch, D-45470 Mulheim, Germany
Identifiers:ISI:000370215400024 [ID No:1]
ISSN:0002-7863 [ID No:2]
DOI:10.1021/jacs.5b11696 [ID No:3]
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