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POLARIZATION USING TRITYLRADICAL

POLARIZATION USING TRITYLRADICAL. WHAT IS TRITYLRADICAL ?. Trityl radical, which is short for Tri phenyl methyl radical. replace hydrogen in the methane by phenyl. methane. Benzene (phenyl). A STRUCTURAL FORMULA. CHARACTERISTICS.

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POLARIZATION USING TRITYLRADICAL

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  1. POLARIZATION USING TRITYLRADICAL

  2. WHAT IS TRITYLRADICAL ? • Trityl radical, which is short for Tri phenyl methyl radical replace hydrogen in the methane by phenyl methane Benzene (phenyl)

  3. A STRUCTURAL FORMULA

  4. CHARACTERISTICS • Radical is center of three benzene, there is little interaction with the other unpaired electrons Unevenness of magnetic moment is small (TEMPO’s radical protrudes from molecular, interaction with the other electrons is big) • Melting point :93.4℃ • Boiling point : 360℃ Tri phenyl methyl radical TEMPO Tritylradical

  5. CHARACTERISTICS g=μβH/hν

  6. ENERGY WIDTH If ⊿g is small? g=μβH/hν ∝⊿g ENERGY LEVEL FOR DNP ！ energy width shrinking ？ microwave Reaction is not caused you can perform absorption and emission in DNP

  7. CHARACTERISTICS g=μβH/hν Trityl radical OX063 0.3 ⊿g/g of Trityl radical is small in comparison with Nitroxylradical In energy width shrinking, you can perform absorption and emission in DNP

  8. PAST RECORD • Polarization of deuteron on D-butanol The maximum polarization of the D-butanol which one used a most commonly nitroxylradical for is around 40%(at 2.5T) Trityl doped D-butanoｌ MAX polarization reach to % 80 T≈150mk,B=2.5T Reference:Nuclear Instruments and Methods in Physics Reserch A 526 (2004)43-52

  9. FROM NOW • Trityl radical get mixed in with CD2 polarization of CD2 doped TEMPO reach to % • CD2 melts in Xylene(dimethylbenzene) at 100 ℃ Does Tritylradical dissolve in Xylene? • Optimize the spin density When doped TEMPO in CD2, the most suitable value was 2.0~3.0×1019spin/cm3 (When doped TEMPO in D-butanol, the most suitable value was 2.0×1019spin/cm3 .On the other hand ,doped OX063 , value was 1.5×1019spin/cm3 ) Try to the world record of the deuteron polarization

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