The Crystal Structure of Feist's Acid

Citation

Petersen, Donald Ralph (1955) The Crystal Structure of Feist's Acid. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/SXC6-W012. https://resolver.caltech.edu/CaltechETD:etd-01202004-095607

Abstract

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. The crystal structure of Feist's acid, 1-methylenecyclopropane-trans-2,3-dicarboxylic acid, has been examined. The substance crystallizes in the triclinic system with space group [...]. Two enantiomorphous molecules of formula [...] are in the unit cell; the direct-cell constants are [...] and [...]. There is good cleavage at the face (010), and this is also the twinning plane. The intensity data from equi-inclination Weissenberg photographs about each crystal axis were utilized in selecting and then refining a trial structure. Punched-card computing techniques were used to carry out least-squares refinements of atomic positions; two Fourier summations aided in final refinement. All refining work was based on full three-dimensional data. Hydrogen bonds bind individual molecules into chains which extend in the [...] direction through the crystal. The methylene groups extended in the [...] direction form cogs on the chains, and two chains related by centers of symmetry are intermeshed closely.

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