Infrared and Raman spectra of spiro[2.4]hepta-4,6-diene and [1,2-2H4]spiro[2.4]hepta-4,6-diene

The i.r. spectra of spiro[2.4]hepta-4,6-diene and of [1,2-2H4]spiro[2.4]hepta-4,6-diene have been measured for gas and liquid samples, for carbon disulfide and carbon tetrachloride solutions, and for samples matrix isolated in argon, krypton or nitrogen. The Raman spectra with depolarization ratios were determined for both isotopic molecules. Vibrational assignments for all fundamental modes of both molecules are proposed based upon polarizations of Raman lines, isotopic frequency shifts, and group frequencies in comparison with vibrational assignments of cyclopentadiene, cyclopropane and d6-cyclopropane.