Knowledge Bank

Infrared ($4000-400cm-1$) and Raman spectra of cyclopropyl chloride ($C3H5Cl$) have been recorded in gaseous, liquid and solid phases. In addition, a high-resolution ($0.5cm-1$) Fourier transform infrared spectrum of cyclopropyl chloride in the vapor phase has also been observed, and it reveals individual P and R branch rotational fine structure on B and C type gas phase vibration-rotation band contours. Based on all the available spectroscopic data such as the infrared gas phase band contours, the Raman depolarization ratios and the solid phase spectra, it has been possible to propose a complete vibrational assignment for this molecule, which is in excellent agreement with the vibrational assignment recently proposed for cyclopropyl $bromide1$. Furthermore, discrepancies in previous assignments for cyclopropyl $chloride2,3$ have been resolved.