THE MICROWAVE SPECTRUM OF PROPIONALDEHYDE,

Abstract

The microwave spectrum of propionaldehyde, was investigated in the frequency region 8-38 Gc. The existence of two stable rotamers has been demonstrated. The cis rotamer, in chich the four heavy atoms are coplanar, is more stable by 900 = 100 cal/mole. An approximate treatment of the coupling of the -CH3 and C-C torsional motions in the cis rotamer is presented. Using this treatment the barrier to internal rotation in the cis rotamer is found to be 2280 = cal/ mole. The dihedral angle in the higher energy, gauche, rotamer is about 131 degrees. Evidence is given for coupling of the C-C torsional momentum and overall rotational angular momentum in the gauche rotamer. Other aspects of the spectrum are also discussed. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1943
Accession Number
AD0434347

Entities

People

  • E. Bright. Wilson Jr.
  • Samuel S. Butcher

Organizations

  • Harvard University

Tags

DTIC Thesaurus Topics

  • Angular Momentum
  • Couplings
  • Dihedral Angle
  • Frequency
  • Microwaves
  • Momentum
  • Physical Properties
  • Rotation
  • Spectra

Readers

  • Control Systems Engineering.
  • Materials Science and Engineering.
  • Organic Chemistry