[第4回日本中性子科学会学会賞奨励賞]受賞特集中性子とX線の相補的利用による水素結合型物質の研究

概要

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Detailed structures of isolated hydrogen-bonded materials, 5-methyl-9-hydroxy-phenalenone (MeHPLN) and 5-bromo-9-hydroxyphenalenone (BrHPLN), were studied by means ofneutron and X-ray diffraction methods. The combination of the two methods made itpossible to observe positive and negative charge distributions. Comparison of the twodistributions revealed discrepancies between them, especially in the hydrogen-bond region. The discrepancy yields a local electronic dipole moment in the hydrogen-bond region ofwhich ordering and disordering were found to be essential in dielectric phase transitionsin the materials. A calculation based on the tunneling model with the measured dipolemoment demonstrated that the phase transitions in MeHPLN and BrHPLN can be explained by this model.
日本中性子科学会の論文