Accession Number : AD0715985

Title :   Vibrational Spectra of Selected Monohalogenated Monocarboxylic Acids.

Descriptive Note : Summary rept. May 69-Apr 70,

Corporate Author : MIAMI UNIV OXFORD OHIO DEPT OF CHEMISTRY

Personal Author(s) : Katon,J. E. ; Carll,Thomas P. ; Danison,Walter

Report Date : OCT 1970

Pagination or Media Count : 76

Abstract : The infrared spectra of sixteen monohalogenated monocarboxylic acids have been recorded in the range 4000-250/cm. In addition the infrared and Raman spectra of iodoacetic acid and sodium iodoacetate have been recorded in the 4000-50/cm region. The spectra have been interpreted in terms of group frequencies that would potentially serve to identify and characterize halogenated acids. The approach has been primarily that of determining the effect of halogen substitution on the normal group frequencies of saturated unsubstituted acids. Temperature effects have been investigated in a preliminary manner on several of the acids. In many cases changes in the spectra are noted when the temperature is lowered. In view of the many polymorphic phases in which acids can exist, these temperature effects cannot be completely explained without considerable additional effort. The vibrational spectra of iodoacetic acid and sodium iodoacetate were investigated in detail and assigned as a model for the spectra of the other acids. There is no evidence for the existence of more than one rotational isomer at room temperature or below and the data are most consistent with a structure in which the iodine atom is trans, or nearly trans, to the carbon-oxygen single bond of the acid. (Author)

Descriptors :   (*HALOGENATED HYDROCARBONS, INFRARED SPECTRA), (*CARBOXYLIC ACIDS, *INFRARED SPECTRA), IODINE COMPOUNDS, CHLORINE COMPOUNDS, BROMINE COMPOUNDS, ACETIC ACID, ACETATES, MOLECULAR STRUCTURE, MOLECULAR ASSOCIATION

Subject Categories : Organic Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE