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首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >3,4 : 9,10-perylenetetracarboxylic dianhydride (PTCDA) by electron crystallography
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3,4 : 9,10-perylenetetracarboxylic dianhydride (PTCDA) by electron crystallography

机译:3,4:9,10-per四羧酸二酐(PTCDA)的电子晶体学

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The crystal structures of the alpha and beta modifications of PTCDA were analyzed as projected structures along the a axes by electron crystallography using an imaging plate. The results for the alpha modification agree well with the sheet-and-stack structure obtained by X-ray diffraction by M. L. Kaplan et al. (private communication, full set of crystal structure data). Projected onto the (102) plane, which is parallel to the molecular sheets, the long molecular axis makes an angle of 42 degrees with the b axis and the hexagonal benzene rings appear slightly elongated, indicating a slight inclination of the molecular plane from the (102) lattice plane. For the beta modification, it was concluded that the molecules are aligned in a herringbone packing scheme on the (102) plane similar to that of the alpha modification, but with a slightly different angle of the long molecular axis with the b axis (38 degrees). [References: 11]
机译:通过使用成像板的电子晶体学分析,将PTC​​DA的α和β修饰的晶体结构分析为沿a轴的投影结构。 α修饰的结果与由M.L.Kaplan等人通过X射线衍射获得的片-叠结构非常吻合。 (私人通信,全套晶体结构数据)。投影到平行于分子片的(102)平面上,长分子轴与b轴成42度角,六边形苯环显得略微拉长,表明分子平面相对于( 102)晶格平面。对于β修饰,得出的结论是,这些分子在(102)平面上以人字形排列方式排列,类似于α修饰,但长分子轴与b轴的夹角略有不同(38度) )。 [参考:11]

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