Infrared spectra of the CH2F2+, CHF2+, CHF+, and FHndash; (CHF)minus;molecular ions in solid argon

摘要

Argon resonance photoionization of argonndash;methylene fluoride samples during condensation at 15 K produced three groups of new infrared absorptions, which are separated by their mercury arc photolysis behavior and isotopic data. Four infrared absorptions assigned to CH2F2+correspond closely with CH2F2neutral absorptions both in position and carbonhyphen;13 and deuterium shifts. The Cndash;H stretching modes of CH2F2+are lowered by the removal of a Cndash;H bonding electron. The high antisymmetric Cndash;F2stretching fundamental for CHF2+at 1608 cmminus;1is consistent with extensive pi bonding in this planar cation. A sharp 1368 cmminus;1absorption is attributed to the Cndash;F stretching mode of CHF+. Strong, broad absorptions showing small carbonhyphen;13 shifts are assigned to the Hndash;F stretching and hydrogen deformation modes of the intramolecular hydrogen bonded electronhyphen;capture product (Fndash;H) ndash;ndash; (CHF)minus;. A vibronic absorption from 413 to 544 nm in these samples is attributed to the CHF intermediate.