Heterogeneous photosensitization—IV. The structure and properties of benzaldehyde photopolymer |
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Authors: | G.R. De Maré J.R. Fox |
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Affiliation: | Laboratoire de Chimie Physique Moléculaire, Faculté des Sciences, CP 160, Université Libre de Bruxelles, Ave F.D. Roosevelt 50, B-1050 Brussels, Belgium |
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Abstract: | The basic structure of benzaldehyde photopolymer (BPOL) consists of phenyl groups attached to a carbon-carbon and carbon-oxygen chain. The average BPOL molecule contains 12 monomer units. Relative rates for the BPOL photosensitized dimerization of 1,3-cyclohexadiene and the isomerizations of the 1,3-pentadienes, cis-1,2-dichloroethylene and cis-2-butene are reported. The BPOL photosensitized isomerizations of the 1,3-pentadienes in the visible (λ > 395 nm) proceed by a simple mechanism. Stern-Volmer plots are linear and the photostationary trans/cis ratio is 2.0, independent of 1,3-pentadiene pressure over the range 2–180 Torr. The energy of the BPOL triplet state is less than but near 53 kcal mol?1. It excites the s-cis 1,3-pentadiene rotamers exclusively. The decay ratio of the s-cis triplets is 3.75. |
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