INFRARED-SPECTRA OF CF3CCH COMPLEXES WITH VARIOUS PROTON ACCEPTORS IN LIQUID ARGON

Fundamental and overtone absorption bands of CF3CCH and its complexes with ethers ("non-linear" complexes) and with amines ("linear" complexes) have been studied in dilute solutions in liquefied argon at 90 K. IR absorption spectra were studied in the region 7000-400 cm-1 with resolution 0.5 cm-1 at 3000 cm-1 and optical path 1.4-163 cm. The frequencies and probabilities of vibrational transitions have been obtained for CF3-CCH (50 bands), for non-linear complexes (25 bands) and for linear complexes (15 bands). Splitting of the E symmetry bands of the non-linear complex has been observed. The complex profile of CH-absorption bands are in agreement with the theoretical approach which considers a complex as a molecule with several low-frequency modes,