Dynamic Structure of Nanospace as Studied by Xenon-129 NMR porosimetry

本研究采用~（129）Xe核磁共振（NMR）技术研究了微乳液、金属配合物和有机分子筛形成纳米空间的动力学特征，以发现和阐明它们的新的物理化学性质<13><129>。其次，我们将该方法应用于金属有机骨架[M_2（O_2CPh）_4（pyz）]_n=Cu，Rh）和氙的高压吸附等温线的测量。此外，我们还对<129>五甘醇单十二醚/重水/癸烷三元体系中的微乳液进行了~ 1H NMR研究。结果表明，<129>正癸烷的化学位移与微乳液的动态平均半径有很好的相关性。这一点有力地说明，<129>化学位移成为测定微乳液粒径的新手段，从而阐明并实现了本课题的研究初衷。此外，我们发现了这种方法的新发展的可能性，如微乳液的大小和探针的分子间相互作用在纳米空间的测定。展望了~ 1H <129>XeNMR孔隙率测定技术的新发展。

In this research, dynamic character of nano-space formed by microemulsion, metallic complex and organic zeolite was investigated by Xenon-129 nuclear magnetic resonance (NMR) spectroscopy, in order to discover and clarification of their novel physicochemical properties.At first, we conducted ^<13>C and ^<129>Xe NMR measurements on typical inorganic zeolites to examine guest-guest and/or guest-host interactions as well as the local structure of adsorbates on the adsorption process.Next, we developed this methodology into metal-organic framework [M_2(O_2CPh)_4(pyz)]_n=Cu, Rh) together with xenon high-pressure adsorption isotherm measurements. It was found that adsorption of xenon in this specimen takes place by forming dimer structure of xenon.In addition, we also applied ^<129>Xe NMR to microemulsion in ternary system of pentaethyleneglycol monododecylether/heavy water/decane. We found that ^<129>Xe chemical shift in decane showed good correlation with the dynamic mean radius of microemulsion. This aspect strongly suggests that ^<129>Xe chemical shift becomes new measure to determine the microemulsion size.Thus, we have clarified and achieved our original aim in this research project. Furthermore, we found the possibility of the newly development of this methodology such as determination of microemulsion size and probe of intermolecular interaction in the nanospace. Future new development of ^<129>XeNMR porosimetry is expected.