结晶学
晶体结构
分子
电子衍射
平面(几何)
衍射
材料科学
苯
格子(音乐)
Crystal(编程语言)
堆栈(抽象数据类型)
六方晶系
电子晶体学
化学
物理
几何学
光学
数学
有机化学
计算机科学
程序设计语言
声学
作者
Tetsuya Ogawa,Kiyoshi Kuwamoto,Seiji Isoda,Takashi Kobayashi,Norbert Karl
出处
期刊:Acta crystallographica
[International Union of Crystallography]
日期:1999-02-01
卷期号:55 (1): 123-130
被引量:104
标识
DOI:10.1107/s0108768198009872
摘要
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 ).
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