Abstract
Infrared and Raman spectra of gaseous cyclopropanecarboxylic acid (C 3H 5COOH and C 3H 5COOD) were measured from 250 to 4000 cm −1. The bands were assigned respectively to the monomer and to an associate. The depolarization ratio measurement, the vib—rot envelope study and the detailed analysis of the v(CO) and v(CH) regions enabled the symmetry and the conformation of the molecular entities in equilibrium to be determined. The monomer belongs to the C s symmetry group and the conformation of its predominant fraction is trans/trans. The associate is a centrosymmetrical dimer ( C i symmetry) having (trans/cis) 2 conformation. Some features of the geometry of the pseudocycle are discussed.
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