Dynamic Nuclear Polarization by Electron Spins in the Photoexcited Triplet State: II. High Polarization of the Residual Protons in Deuterated Naphthalene

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  • Takeda Kazuyuki
    Department of Chemistry, Graduate School of Science, Kyoto University
  • Takegoshi K.
    Department of Chemistry, Graduate School of Science, Kyoto University
  • Terao Takehiko
    Department of Chemistry, Graduate School of Science, Kyoto University

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  • Dynamic Nuclear Polarization by Electron Spins in the Photo-excited Triplet State(2)High Polarization of the Residual Protons in Deuterated Naphthalene

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Experiments of dynamic nuclear polarization by electron spins in the photoexcited triplet state were made using single crystal and polycrystalline samples of 99.21%-deuterated naphthalene doped with 0.015 mol% pentacene. In the single crystal sample, the polarization of the residual protons was built up to 0.7 at 105 K, reaching the ultimate polarization equal to the photo-induced electron spin polarization. A doublet due to the two protons which happen to be adjacent to each other in a deuterated naphthalene molecule was observed in the single crystal under deuteron double-quantum decoupling; it exhibits polarization-induced asymmetry when observed by a small-tip angle pulse. In the polycrystalline sample the resultant 1H polarization was 0.033. The 1H NMR lineshape under deuteron decoupling in the single crystal and the inhomogeneous 1H distribution in a deuterated naphthalene molecule are discussed.

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