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首页> 外文期刊>Chemistry: A European journal >Definitive Support by Transmission Electron Microscopy, Electron Diffraction, and Electron Density Maps for the Formation of a BCC Lattice from Poly{N-[3,4,5-tris(n-dodecan-1-yloxy)benzoyl]ethyleneimine}
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Definitive Support by Transmission Electron Microscopy, Electron Diffraction, and Electron Density Maps for the Formation of a BCC Lattice from Poly{N-[3,4,5-tris(n-dodecan-1-yloxy)benzoyl]ethyleneimine}

机译：通过透射电子显微镜，电子衍射和电子密度图确定的支持，用于从聚{N- [3,4,5-三（n-十二烷基-1-基氧基）苯甲酰基]亚乙基亚胺}形成BCC晶格

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摘要

Transmission electron microscopy (TEM), electron diffraction (ED), and electron density maps (EDM) experiments were carried out on a Poly{N-[3,4,5-tris(n-dodecan-1-yloxy)benzoyl]ethyleneimine} {poly[(3,4,5)12G1-Oxz]} with a degree of polymerization (DP) of 20. All experiments confirmed the thermotropic body-centered cubic (BCC) Im3m lattice suggested previously by X-ray diffraction (XRD) experiments. The unit cell parameter determined by ED at 23 deg C is a=42.4 A, in good agreement with XRD results which show a=42.6 A after quenching from 70 deg C. EDM of the XRD results confirm that the supramolecular minidendrimer obtained from poly[(3,4,5)12G1-Oxz] adopts a spherical "inverse micellar-like" structure, with the polyethyleneimine backbone and the aromatic groups microsegregated and concentrated in the corners and in the center of the cubic unit cell. A space-filling continuum is realized by the n-alkyl groups that radiate out of the aromatic core of the spherical dendrimer. This manuscript is only the second example of complete structural analysis of a lattice generated from supramolecular objects and complements the previous example reported from our laboratory on the Pm3n lattice.
机译：透射电子显微镜（TEM），电子衍射（ED）和电子密度图（EDM）实验是在聚{N- [3,4,5-三（正十二烷-1-基氧基）苯甲酰基]乙烯亚胺上进行的}（聚合度（DP）为20的{poly [（3,4,5）12G1-Oxz]}}。所有实验均证实了X射线衍射（XRD）先前提出的热致体心立方（BCC）Im3m晶格）实验。 ED在23摄氏度下确定的晶胞参数为a = 42.4 A，与XRD结果吻合良好，XRD结果表明，从70摄氏度淬灭后，a = 42.6A。XRD结果的EDM证实，由poly [ （3,4,5）12G1-Oxz]采用球形“反胶束状”结构，聚乙烯亚胺主链和芳族基团微分离并集中在立方晶胞的角落和中心。通过从球形树枝状大分子的芳族核辐射出来的正烷基实现空间填充连续体。该手稿只是对由超分子物体生成的晶格进行完整结构分析的第二个示例，是对我们实验室报告的Pm3n晶格的先前示例的补充。

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