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Cooperative enhancement versus additivity of two-photon-absorption cross sections in linear and branched squaraine superchromophores

Please always quote using this URN: urn:nbn:de:bvb:20-opus-188299
  • The linear and nonlinear optical properties of a series of oligomeric squaraine dyes were investigated by one-photon absorption spectroscopy (1PA) and two-photon absorption (2PA) induced fluorescence spectroscopy. The superchromophores are based on two indolenine squaraine dyes with transoid (SQA) and cisoid configuration (SQB). Using these monomers, linear dimers and trimers as well as star-shaped trimers and hexamers with benzene or triphenylamine cores were synthesised and investigated. The red-shifted and intensified 1PA spectra of allThe linear and nonlinear optical properties of a series of oligomeric squaraine dyes were investigated by one-photon absorption spectroscopy (1PA) and two-photon absorption (2PA) induced fluorescence spectroscopy. The superchromophores are based on two indolenine squaraine dyes with transoid (SQA) and cisoid configuration (SQB). Using these monomers, linear dimers and trimers as well as star-shaped trimers and hexamers with benzene or triphenylamine cores were synthesised and investigated. The red-shifted and intensified 1PA spectra of all superchromophores could well be explained by exciton coupling theory. In the linear chromophore arrangements we also found superradiance of fluorescence but not in the branched systems. Furthermore, the 2PA showed enhanced cross sections for the linear oligomers but only additivity for the branched systems. This emphasizes that the enhancement of the 2PA cross section in the linear arrangements is probably caused by orbital interactions of higher excited configurations.show moreshow less

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Metadaten
Author: Harald Ceyman, Arnulf Rosspeintner, Maximilian H. Schreck, Carina Mützel, Andreas Stoy, Eric Vauthey, Christoph Lambert
URN:urn:nbn:de:bvb:20-opus-188299
Document Type:Journal article
Faculties:Fakultät für Chemie und Pharmazie / Institut für Organische Chemie
Language:English
Parent Title (English):Physical Chemistry Chemical Physics
Year of Completion:2016
Volume:18
Issue:24
Pagenumber:16404-16413
Source:Physical Chemistry Chemical Physics (2016) 18:24, 16404-16413. https://doi.org/10.1039/c6cp02312f
DOI:https://doi.org/10.1039/c6cp02312f
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 54 Chemie / 547 Organische Chemie
Tag:2-photon absorption; Chromophores; Design; Dyes; Intensity; Molecules; Multibranched structures; One-photon; Optical properties; Vibronic contributions
Release Date:2020/06/04
Licence (German):License LogoCC BY: Creative-Commons-Lizenz: Namensnennung