Heterogeneous photosensitization—III the benzaldehyde photopolymer photosensitization of the 1,3-pentadienes in the gas phase [1]

The i.r. absorption spectrum of benzaldehyde photopolymer, formed by photolysis of benzaldehydc: (λ > 300 nm, T = 50°) in a Pyrex cell, shows the absence of specific benzoin absorption at 10·2 μm. The kinetics of the photopolymer sensitized cis ? trans isomerization of the 1.3-pentadienes have been studied for λ > 300 nm and pentadiene pressures between 1 and 470 torr. The luminescence excitation spectra of the photopolymer, the Stern- Volmer plots, and the photostationary state ratios of the 1.3-pentadienes all indicate the presence of two different types of active chromophores in the photopolymer.