Raman Spectra of Acetylenes VI. 1-Butyne, 1-Pentyne, 1-Hexyne, 3-Hexyne, 4-Octyne and 1-Chloro-1-heptyne

Abstract

Raman displacements, estimated intensities and depolarization factors have been obtained for CH₃CH₂C≡CH, CH₃(CH₂)₂C≡CH, CH₃(CH₂)₃C≡CH, CH₃CH₂C≡CCH₂CH₃, CH₃(CH₂)₂C≡C(CH₂)₂CH₃, and CH₃(CH₂)₄C≡CCl. The data obtained in the 2200 cm⁻¹ region were [2068(1)P], 2118(10)0.5, 2158(3)0.5; [2064(0)], 2118(10)0.5; 2071(0), 2094(0), 2118(10)0.4; 2200(1)P, 2231(9)0.4, 2247(8)0.4, 2301(6)0.4; 2234(10)0.5, 2292(6)0.5; 2148(1)P, 2194(1)P, and 2243(10)0.4, respectively. Unusual features are the appearance of the second strong line at 2158 cm⁻¹ in the spectrum of 1‐butyne and the absence of the line near 2245 cm⁻¹ in the spectrum of 4‐octyne. Introduction of the Cl atom in the last compound radically modifies the spectrum in this region.