Title

Transparent Ceramics For Lasers - A Game-Changer

Keywords

Cycloaddition; Isomerization; Pentacene; Photochemistry; Retro reactions

Abstract

Herein we report the formation of the second-ring Diels-Alder adduct together with the central-ring adduct in a reaction of pentacene and tetracyanoethylene at room temperature. DFT calculations showed that the difference between the free energy of the two isomers is about 3.9 kcal/mol. Photo- and thermal-induced isomerization between the central-ring adduct and the second-ring adduct were studied in solution and in polymer films. In solution, the less-stable second-ring adduct can be converted into the more-stable central-ring adduct either thermally or photochemically, but the reverse transformation does not occur. In a polymer matrix, isomerization can be photochemically induced in both directions at different wavelengths, which results in a photoswitchable system. Formation of pentacene in the photochemical experiments was also observed, which supports an isomerization process involving a photo-retro-Diels-Alder reaction. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Publication Date

5-1-2012

Publication Title

American Ceramic Society Bulletin

Volume

91

Issue

14

Number of Pages

30-33

Document Type

Article

Personal Identifier

scopus

Socpus ID

84860770544 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84860770544

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