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A new and versatile fluorescence standard for quantum yield determination
Umeå University, Faculty of Science and Technology, Chemistry.
2001 (English)In: PHYSICAL CHEMISTRY CHEMICAL PHYSICS, ISSN 1463-9076, Vol. 3, no 2, 172-4 p.Article in journal (Refereed) Published
Abstract [en]

It is demonstrated that a new bichromophoric compound, N-2,N-3-[bis(1-hexylheptyl)-benzo[ghi]perylene-2,3,8,9,11,12-hexacarboxylic-2,3:8,9:11,12-tris(dicarboximide)]-N-1,N-1'-(1,2-ethyl)-[N-2'-(1-octylnonyl)-perylene-3,4:9,10-bis(dicarboximide)] (denoted by 1-2), provides a versatile reference molecule for measurements of fluorescence quantum yields. The compound consists of a donor (1) and an acceptor (2) part for the electronic energy. Absorption spectra of 1-2 form a nearly perfect superposition of the corresponding spectra for 1 and 2. In addition to a fluorescence quantum yield of one, 1-2 allows for choosing excitation wavelengths between 300 and 530 nm. The fluorescence lifetime of 1-2 is 4.0 +/- 0.1 ns and is independent of the excitation wavelength. The fluorescence excitation anisotropy reveals that the S-0 --> S-1 and S-0 --> S-2 transition dipoles of 1 are preferentially polarised parallel and perpendicular, respectively, to the C-2-symmetry axis of 1. The rapid transfer of electronic energy is compatible with energy transfer of the Forster type.

Place, publisher, year, edition, pages
2001. Vol. 3, no 2, 172-4 p.
Identifiers
URN: urn:nbn:se:umu:diva-8632DOI: doi:10.1039/b007671fOAI: oai:DiVA.org:umu-8632DiVA: diva2:148303
Available from: 2008-05-06 Created: 2008-05-06 Last updated: 2011-01-13Bibliographically approved

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Johansson, Lennart B-Å

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