✦ LIBER ✦

Heterogeneous photosensitization—IV. The structure and properties of benzaldehyde photopolymer

✍ Scribed by G.R. De Maré; J.R. Fox

Publisher: Elsevier Science
Year: 1981
Tongue: English
Weight: 510 KB
Volume: 17
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(81)90170-1

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✦ Synopsis

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-l,2-dichloroethylene and cis-2-butene are reported. The BPOL photosensitized isomerizations of the 1,3-pentadienes in the visible (2 > 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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