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首页> 外文期刊>Crystal growth & design >Fabrication of Nanocrystals from Diolefin Derivatives and Their Solid-State Photoreaction Behavior
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Fabrication of Nanocrystals from Diolefin Derivatives and Their Solid-State Photoreaction Behavior

机译：由二烯烃衍生物制备纳米晶体及其固态光反应行为

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Nanocrystals of seven p-phenylenediacrylates, i.e., dimethyl (1a), didecyl (1b), diundecyl (1c), ditetradecyl (1d), dipentadecyl (1e), dioctadecyl (1f), and dicholesteroyl (1g) derivatives, and 2,5-distyrylpyrazine (2) were fabricated by the re-precipitation method and their photochemical reaction behaviors were investigated in comparison to those of bulk crystals. The bulk crystals of 1a-1c and 2 were found to be photoreactive, whereas those of 1d-1g were less photoreactive. In contrast, all of the nanocrystals of 1a-1g and 2 showed high photoreactivity. Nanocrystals of 1a and 2 were demonstrated to have the same packing as the corresponding polymerizable bulk crystals, and they gave the corresponding polymers by photoirradiation. The polymer crystal structures in their nanocrystals were confirmed to be the same as those in bulk crystals by X-ray and electron diffraction analyses. Their single-crystal-to-single-crystal transformation was established by their nanocrystallization. On the other hand, other nanocrystals (1b-1g) were found to have different packings compared with the corresponding bulk crystals. After photoirradiation, their crystallinity was degraded to form amorphous products.
机译：七种对苯二甲酸酯的纳米晶体，即二甲基（1a），二癸基（1b），二十一烷基（1c），二十四烷基（1d），二十五烷基（1e），二十八烷基（1f）和二胆固醇酯（1g）衍生物，以及2,5用重沉淀法制备了二苯乙烯基吡嗪（2），并与大晶体比较研究了它们的光化学反应行为。发现1a-1c和2的块状晶体具有光反应性，而1d-1g的块状晶体则光反应性较低。相比之下，所有1a-1g和2的纳米晶体都显示出高光反应性。已证明1a和2的纳米晶体具有与相应的可聚合块状晶体相同的堆积，并且它们通过光辐照得到了相应的聚合物。通过X射线和电子衍射分析，证实了其纳米晶体中的聚合物晶体结构与块状晶体中的相同。它们的单晶到单晶转变是通过它们的纳米结晶建立的。另一方面，发现其他纳米晶体（1b-1g）与相应的块状晶体相比具有不同的堆积。光辐照后，它们的结晶度降低，形成无定形产物。

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