Polymerization processes proposed for HC₅N photochemistry at longer wavelength photons (>300 nm), based on the scheme proposed by Clarke & Ferris (1997) for HC₃N polymerization. Based on the infrared spectra, we propose possible structures for HC₅N polymers. excited state. We expect a simple –CH functional group (aromatic) in the polymer due to the end –CH group of the monomer and both aliphatic –CH and amine NHx functionality due to additional hydrogen transfer from one monomer to another monomer.