Matrix Isolation of Monomeric and Polymeric Forms of Acrylonitrile

The infrared spectrum of a sample isolated at low temperature in an inert matrix is simplified by certain factors but complicated by others. Studies of band splittings directed toward information on symmetry changes, rotational effects (gross or internal), isotope effects, or molecular interactions may be bedevilled by band multiplicites arising from self-aggregation to polymers or from trapping of samples in differing sites. There is an urgent need for better experimental and theoretical grasp of these phenomena.