Matrix isolation study of the vacuum ultraviolet photolysis of allene and methylacetylene. Vibrational and electronic spectra of the species C3, C3H, C3H2, and C3H3

摘要: Upon hydrogen-discharge photolysis of normal or deuterium-substituted allene methylacetylene in an argon a nitrogen matrix at 14°K, infrared absorptions all the C3Hn species with n < 4 appear. A hydrogen-deformation fundamental C3H2 has been identified far infrared. Infrared studies partially deuterium- substituted methylacetylenes indicate that extensive photoisomerization occurs. The observed products are consistent those predicted using previously postulated gas-phase mechanism. ultraviolet spectrum C3H3 corresponds closely characteristic molecule. Comparison between 1900 and 4000 photolyzed matrix-isolated graphite vapor indicated any new electronic transition C3 this region must be weak.