The Study of a Crystal Structure by X-Ray Diffraction and Some Molecular Structures by Electron Diffraction

Citation

Wong, Chi-hsiang (1957) The Study of a Crystal Structure by X-Ray Diffraction and Some Molecular Structures by Electron Diffraction. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/SE1Q-EG73. https://resolver.caltech.edu/CaltechETD:etd-08172004-163006

Abstract

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. The crystal structure of phenylcyclobutenedione has been investigated by the x-ray diffraction method. Three-dimensional techniques were used to deduce and to refine the trial structure. The space group is [...] with four molecules per unit cell. Electron diffraction photographs have been made of cuprous chloride vapor. A six-membered alternating ring model of the trimer molecule with [...] and very large amplitude of symmetric bending vibration seems plausible and is shown to be in agreement with the diffraction pattern. The electron diffraction study of two light-heavy compounds [...] has verified the complex nature of the atomic scattering factors for electron diffraction. The bond lengths and bond angles of these two compounds are also determined. The proposed structural formula of the polycyclohydrocarbon [...] (the 'cage') is consistent with the electron diffraction pattern. The average bond length was found to be longer than the normal C-C single bond length in both 'cage' and norbornane. A simple treatment based on a Hooke's law potential for bond stretchings and cross-ring repulsions gives pleasing agreement with the experimental result for the average bond lengths.

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