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首页> 外文会议>Yugoslav Materials Research Society conference >n-Alkane Nanoparticles in Cryogenic Trichiorofluoromethane/n-Alkane Systems: Their Use in the Study of the σ-Basicity of n-Alkanes
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n-Alkane Nanoparticles in Cryogenic Trichiorofluoromethane/n-Alkane Systems: Their Use in the Study of the σ-Basicity of n-Alkanes

机译：低压richorofluoromethane / N-烷烃体系中的N-烷烃纳米颗粒：它们在研究N-烷烃的σ-碱度研究中

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摘要

Under cryogenic conditions, n-alkane nanoparticles are formed in trichlorofluorornethane/n-alkane systems. γ-Irradiation in combination with EPR-spectroscopy has been utilized to characterize these nanoparticles and to determine their physical state (crystalline vs. amorphous). From such experiments, it appears that the size of these nanoparticles can be controlled through experimental parameters, such as concentration and chain length of the n-alkane solute, and that it may range from essentially monomolecular to aggregates large enough to crystallize. The n-alkane nanoparticles appear very useful for gaining insight into the properties of pentacoordinated alkyl carbonium ions and into the σ-basicity of n-alkanes. γ-Irradiated cryogenic trichlorofluoro-methane/n-alkane systems have proven invaluable in the study of symmetric proton transfer from alkane radical cations to alkane molecules, a reaction process that is characterized by quite intriguing selectivity with respect to both the site of proton donation and proton acceptance. Such investigations are currently leading to a profound insight into the relative propensity of different C-H bonds in alkanes to act as proton acceptor.
机译：在低温条件下，N-烷烃纳米颗粒形成在三氯氟甲烷/ N-烷烃体系中。 γ-辐射与EPR光谱相结合，已被利用来表征这些纳米颗粒并确定其物理状态（结晶与无定形）。从这样的实验中，似乎可以通过实验参数来控制这些纳米颗粒的尺寸，例如N-烷烃溶质的浓度和链长，并且它可以从基本上单分子到足够大的聚集以结晶。 N-烷烃纳米颗粒看起来非常有用，可用于获得对五戊烷基碳离子的性质以及N-烷烃的σ碱度的洞察力。 γ-辐照的低温三氯氟氟 - 甲烷/ N-烷烃体系已经证明在研究烷烃自由基阳离子至烷烃分子的对称质子转移的研究中是无价的，该反应过程的特征在于相对于质子捐赠部位的相对较小的选择性。质子验收。此类调查目前导致深入了解烷烃中不同C-H键的相对倾向，以充当质子受体。

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