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The crystal structures of some organic compounds

Citation

Takei, William Junkichi (1957) The crystal structures of some organic compounds. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-08302004-154057

Abstract

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The crystal structure of acetamide hemihydrochloride has been determined by x-ray diffraction techniques. Three dimensional data were utilized for obtaining the final parameters by least squares and Fourier synthesis refinement techniques with an average positional standard deviation of 0.009 A. The results for acetamide molecule show bond distances closer to those previously accepted than to those from the investigation of acetamide itself. There is a distance of 2.40 A between two oxygen atoms related by a center of symmetry. This has been interpreted as a hydrogen bond and as such would be the shortest such distance reported.

Potassium dicyanoguanidine crystallizes in an orthorhombic space group, either Pbcm (centrosymmetric) or [...] (non-centrosymmetric). A structure has been determined conforming to Pbcm using least squares and generalized Fourier projections. The average positional standard deviation is 0.006 A for carbon and nitrogen. One of the C-N distances of the guanidine group is significantly shorter than the others. The two terminal NCN groups are not exactly linear, contrary what might be expected. Each potassium ion is surrounded by eight nitrogens in a distorted Archimedes antiprism.

A study of the structure of the dimer phenylisocyanate was initiated but discontinued for reasons which are discussed.

Item Type:Thesis (Dissertation (Ph.D.))
Degree Grantor:California Institute of Technology
Division:Chemistry and Chemical Engineering
Major Option:Chemistry
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Hughes, Emlyn Willard
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1957
Record Number:CaltechETD:etd-08302004-154057
Persistent URL:http://resolver.caltech.edu/CaltechETD:etd-08302004-154057
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3278
Collection:CaltechTHESIS
Deposited By: Imported from ETD-db
Deposited On:31 Aug 2004
Last Modified:26 Dec 2012 02:58

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