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Acid Anhydride

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Hans Wolfgang Spiess – One of the best experts on this subject based on the ideXlab platform.

  • high resolution solid state nmr studies of poly vinyl phosphonic Acid proton conducting polymer molecular structure and proton dynamics
    Journal of Physical Chemistry B, 2007
    Co-Authors: Young Joo Lee, Bahar Bingol, Tatiana Murakhtina, Daniel Sebastiani, Wolfgang H Meyer, Gerhard Wegner, Hans Wolfgang Spiess
    Abstract:

    The structure and the local proton mobility of poly(vinyl phosphonic Acid) were studied by solid-state NMR under fast magic-angle spinning. At elevated temperatures, the signature of the hydrogen-bonded P−OH protons is observed in 1H magic-angle spinning (MAS) NMR as a single resonance at 10.5 ppm. Both 1H double-quantum NMR and variable-temperature experiments demonstrate that P−OH protons are mobile and thus able to contribute to proton conductivity. Below room temperature, two different types of hydrogen-bonded P−OH resonances are observed at 10.5 and 15 ppm, and 1H double-quantum NMR demonstrates that these protons are immobile on the NMR time scale. By means of first-principles calculations of a model polymer, we have assigned the additional hydrogen-bonded species at lower temperatures to phosphonic Acid Anhydride and charged Anhydride. Also, in the 31P MAS NMR spectrum, two distinct resonances appear, arising from “normal” phosphonic Acid and phosphonic Acid Anhydride. 31P double-quantum NMR experi…

Gernot Frenking – One of the best experts on this subject based on the ideXlab platform.

  • donor acceptor stabilized silicon analogue of an Acid Anhydride
    Journal of the American Chemical Society, 2011
    Co-Authors: Rajendra S Ghadwal, Ramachandran Azhakar, Herbert W Roesky, Kevin Propper, Birger Dittrich, Susanne Klein, Gernot Frenking
    Abstract:

    A stable silicon analogue of an Acid Anhydride {PhC(ButN)2}Si{═O·B(C6F5)3}O–Si(H){═O·B(C6F5)3}{(NBut)(HNBut)CPh} (4) with a O═Si–O–Si═O core has been prepared by treating monochlorosilylene PhC(ButN)2SiCl (1) with H2O·B(C6F5)3 in the presence of NHC (NHC = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene). Compound 4 has been characterized by elemental analysis and multinuclear NMR spectroscopic investigations. The molecular structure of 4 has been established by single-crystal X-ray diffraction studies, and DFT calculations support the experimental results.

Young Joo Lee – One of the best experts on this subject based on the ideXlab platform.

  • high resolution solid state nmr studies of poly vinyl phosphonic Acid proton conducting polymer molecular structure and proton dynamics
    Journal of Physical Chemistry B, 2007
    Co-Authors: Young Joo Lee, Bahar Bingol, Tatiana Murakhtina, Daniel Sebastiani, Wolfgang H Meyer, Gerhard Wegner, Hans Wolfgang Spiess
    Abstract:

    The structure and the local proton mobility of poly(vinyl phosphonic Acid) were studied by solid-state NMR under fast magic-angle spinning. At elevated temperatures, the signature of the hydrogen-bonded P−OH protons is observed in 1H magic-angle spinning (MAS) NMR as a single resonance at 10.5 ppm. Both 1H double-quantum NMR and variable-temperature experiments demonstrate that P−OH protons are mobile and thus able to contribute to proton conductivity. Below room temperature, two different types of hydrogen-bonded P−OH resonances are observed at 10.5 and 15 ppm, and 1H double-quantum NMR demonstrates that these protons are immobile on the NMR time scale. By means of first-principles calculations of a model polymer, we have assigned the additional hydrogen-bonded species at lower temperatures to phosphonic Acid Anhydride and charged Anhydride. Also, in the 31P MAS NMR spectrum, two distinct resonances appear, arising from “normal” phosphonic Acid and phosphonic Acid Anhydride. 31P double-quantum NMR experi…